AP State Board Notes

Students can go through AP State Board 10th Class Biology Notes Chapter 7 Coordination in Life Processes to understand and remember the concept easily.

AP State Board Syllabus 10th Class Biology Notes Chapter 7 Coordination in Life Processes

→ Every life process is dependent on others to keep the body in good condition.

→ When glucose levels in the blood fall we get hunger pangs in the stomach.

→ The hormone ghrelin secreted in the stomach is responsible for hunger generating sensations.

→ Ghrelin is secreted from certain cells in the wall of the stomach.

→ Hormone leptin suppresses hunger.

→ Interactions between the senses of taste and smell enhance our perceptions of the foods we eat.

→ Russian scientist Ivan Pavlov has conducted experiments on conditioned reflexes.

→ Taste can be identified easily when the tongue is pressed against the palate.

→ Food in the mouth has to be broken down into tiny pieces to increase the surface area for the action of substances that aid in digestion.

→ The dental formula of human beings is \(\frac{2,1,2,3}{2,1,2,3}\)

→ The fifth cranial nerve controls the movement of muscles in the jaw.

→ The mechanism for swallowing is also under nervous coordination and its control center is in the brain stem.

→ The nature of saliva is alkaline.

→ Saliva is secreted by the action of the autonomous nervous system from salivary glands. The chewing of food in the mouth forms a slurry mass called a bolus.

→ The wall of the esophagus is made up of inner layer circular muscles and the outer layer longitudinal muscles.

→ Contraction and relaxation of the muscles present in the esophagus resulting in wave-like movements called peristaltic movements.

→ The food from the esophagus reaches the stomach by peristaltic movements.

→ The partially digested food present in the stomach is known as chyme.

→ Pyloric sphincter present at the opening of the stomach and small intestine releases a small amount of chyme into the duodenum.

→ Reverse peristalsis occurs in ruminating animals like cows.

→ The gastric juice produced by the stomach contains mucus, hydrochloric acid, and pepsin. Food is completely digested in the small intestine.

→ Absorption of nutrients by villi takes place in the small intestine.

→ The neural apparatus of our digestive tract comprises a vast and complicated network of neurons called the second brain or enteric nervous system.

→ The enteric nervous system stimulates and coordinates the breakdown of food, absorbing nutrients and expelling wastes from the body.

→ We secrete around 1 to 1.5 liters of saliva per day.

→ Oxidation of food is required to release energy.

→ Respiration is controlled by the medulla oblongata of the autonomous nervous system.

→ Digestion occurs in the food canal, coordination of respiration and blood circulation is necessary otherwise oxidation of food and transport of substances will not take place.

→ Ghrelin: It is a hormone produced mainly by the cells lining the human stomach and cells of the pancreas which stimulate hunger.

→ Leptin: It is the hormone that suppresses hunger.

→ Gustatory: Concerned with tasting or the sense of taste.

→ Chemoreceptors: Sensory cells or organs responsive to chemical stimuli.

→ Papillae: One of the certain small protuberances concerned with the senses of touch, taste, and smell.

→ Food Bolus: A small rounded mass of substance, especially of chewed food at the moment of swallowing.

→ Peristalsis: Contraction and relaxation of circular and longitudinal muscles in the esophagus bring a wave Like motion that propels the food bolus into the stomach by the action called peristalsis.

→ Chyme: The partly digested food in the stomach.

→ Pyloric Sphincter: Muscles present at the opening of the stomach and the first part of the small intestine and duodenum.

→ Villi: These are tiny finger-like projections that enable the small intestine to absorb nutrients from food.

→ Medulla oblongata: The continuation of the spinal cord within the skull, forming the lowest part of the brain stem and containing control centers for the heart and lungs.

→ Brain stem: The central trunk of the mammalian brain, consisting of the medulla oblongata, Ponsvaroll, and midbrain.

→ Hunger pangs: These are the contractions made by the stomach when we feel hungry.

→ Stale food: Food that is not freshly prepared but not harmful. It may not taste good.

→ Sipping: To drink a liquid by taking small mouthfuls.

→ Relish: Liking or enjoyment of the taste of something.

→ Palate: The roof of the mouth, separating the cavities of the mouth and nose invertebrates.

→ Munch: To chew with the steady or vigorous working of the jaws, often audibly.

→ MasticatIon: Biting and grinding food in our mouth so it becomes soft enough to swallow.

→ Belching: It is the emission of wind noisily from the stomach through the mouth.

→ PorrIdge: It is a dish made by boiling ground, crushed or chopped cereal In water, milk, or both.

→ Rumination: The process of rechewing the cud to further break down plant matter and stimulate digestion is called rumination.

→ Succus entericus: Intestinal juice secreted by glands lining the small intestinal walls. It continues downwards to form the spinal cord.

→ Neurotransmitter: A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and by diffusing across the synapse and junction. It affects the transfer of the impulse to another nerve fiber, muscle fiber, or some other structure.

→ Second brain (or) Enteric nervous system: One of the main divisions of the autonomic nervous system and consists of a mesh-like system of neurons that governs the function of the gastrointestinal system.

→ Colon: It is the last part of the digestive system in most vertebrates. It removes water, salt, and some nutrients forming stool.

→ Anal sphincter: Either of two sphincters controlling the closing of the anus.

→ Ivan Petrovich Pavlov [1849 – 1936]:

• Ivan Petrovich Pavlov [1849 – 1936] was a famous Russian physiologist.
• He devoted his life to the study of physiology and sciences, making several remarkable discoveries and ideas that were passed on from generation to generation.
• Inspired when the progressive ideas which D.l. Pisarev, the most eminent of the Russian literary critics of the 1860s and I. M. Sechenov, the father of Russian physiology, were spreading, Pavlov abandoned his religious career and decided to devote his life to science.
• In 1870 he enrolled In the physics and mathematics faculty at the University of Saint Petersburg to take the course in natural science.
• He won the Nobel Prize for Physiology or Medicine in 1904.

Students can go through AP State Board 9th Class Physical Science Notes Chapter 8 Gravitation to understand and remember the concept easily.

AP State Board Syllabus 9th Class Physical Science Notes Chapter 8 Gravitation

→ Uniform circular motion is a motion of the body with a constant speed in a circular path

→ The acceleration which can change only the direction of the velocity of a body is called centripetal acceleration.

→ The net force which can change only the direction of the velocity of a body is called centripetal force directed towards the centre of the circle.

→ Centripetal force F_c = mv²/R

→ The universal law of gravitation states that everybody in the universe attracts other bodies within a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

→ Universal gravitational constant G = 6.67 × 10^-11 Nm² kg^-2

→ Acceleration due to gravity (g) is independent of the mass of the body

→ When a body is thrown up ‘g’ is taken as negative and for a freely falling body, ‘g’ is positive.

→ A body is said to be free-falling when it starts with ‘zero’ velocity and travelling vertically downward.

→ During free-fall conditions, the body is in a state of weightlessness.

→ The point where total weight appears to act is called the ‘centre of gravity.

→ If we draw a line straight down from the centre of gravity of an object of any shape and it falls inside the base of the object, then the object will be stable

→ If the line through the centre of gravity falls outside the base then the object will be unstable.

→ The body is in equilibrium when the weight vector goes through the base of the body.

→ The distance of the moon from the centre of the earth is 384400 km (or) 3.844 × 10¹⁰ cm.

→ The time period of the moon around the earth = 27.3 days (or) 2.35 × 10⁶ s.

→ Acceleration of bodies acquired near the surface of earth ‘g’ = 981 cm/s² (or) 9.81 m/s²

→ Radius of earth Re = 6.4 × 10⁶ km.

→ Universal gravitational constant G = 6.67 × 10^-11 Nm² kg^-2.

→ Mass of the earth (M) = 6 × 10²⁴ kg.

→ Uniform circular motion: The motion of a body with constant speed in a circular path is called uniform circular motion.

→ Centripetal acceleration: The acceleration which causes changes only in the direction of the velocity of a body is called centripetal acceleration and it is always directed towards the centre of the circle.

→ Centripetal force: The net force required to keep a body in uniform circular motion is called centripetal force.
F = mv²/ R

→ Centre of gravity: The point where total weight appears to act is called the centre of gravity.

→ Law of gravitation: Every object in the universe attracts other bodies. The force of attraction between the bodies is directly proportional to the product of masses and inversely proportional to the square of the distance between them.

→ Weight: The weight of an object is the force of gravity acting on it.
W = mg

→ Weightlessness: During free-fall conditions, the body is in a state of ‘weight lessness’.

→ Stability: If we draw a line straight down from the centre of gravity of an object of any shape and it falls inside the base of the object, then the object will be stable.

→ Freefall: A body is said to be free-falling when it starts with ‘zero’ velocity and travelling vertically downward.

→ Sir Isaac Newton

• Newton was a British physician and mathematician.
• His lifetime is from 25-12-1642 to 20-03-1727.
• He studied the motion of bodies and framed the laws of motion.
• He is well known for his famous universal law of gravitation.

Students can go through AP State Board 10th Class Biology Notes Chapter 6 Reproduction to understand and remember the concept easily.

AP State Board Syllabus 10th Class Biology Notes Chapter 6 Reproduction

→ Reproduction is necessary for the perpetuation and continuation of life.

→ Reproduction is of mainly two types – sexual and asexual reproduction.

→ Asexual reproduction involves a single parent without the fusion of gametes.

→ The fusion of gametes takes place in sexual reproduction.

→ In sexual reproduction, only half of each parent’s chromosomes are passed to the next generation.

→ Fission, budding, fragmentation, regeneration, spore formation are the ways of asexual reproduction.

→ Vegetative propagation is of two types – natural and artificial propagation.

→ In natural vegetative propagation, new plants are produced from vegetative parts like leaves, stems and roots etc.

→ Artificial vegetative propagation is done through cutting, layering and grafting. Through grafting, we can acquire desirable characters of plants.

→ Tissue culture is a modern technique of growing plants in which more plants can be produced in a short time.

→ Fungi reproduce asexually through spore formation.

→ Sexual reproduction involves the fusion of male and female gametes. Union of gametes is known as fertilisation.

→ Fertilization takes place either outside the body of the mother or inside the mother’s body.

→ The male reproductive system consists of a pair of the testis, accessory glands and a system of ducts.

→ Testes are the male reproductive organ and produce spermatozoa or sperms and also secrete male sex hormone called testosterone.

→ Accessory glands include one prostrate and two Cowper glands which secrete a fluid called semen.

→ The duct system consists of Vasefferentia, epididymis, vas deference etc.

→ The sperm cell is a flagellated structure with a long tail that helps it to move towards the ovum.

→ The female reproductive system consists of a pair of ovaries that produce the ovum or egg

→ Graffin follicles of the ovary produce ova.

→ In human beings fertilisation occurs in the fallopian tube of the female reproductive system.

→ The placenta is a tissue formed by the cells from the embryo and the mother and it supplies nutrients to the embryo.

→ From the third month of pregnancy, the embryo is called a foetus.

→ Corian and Amnion are the membranes formed by the growing embryo.

→ The umbilical cord connects the embryo with the placenta.

→ The gestation period in human beings is 9 months or 280 days.

→ The reproductive part of the flower that contains sex cells or germ cells is stamens and carpels.

→ Pollen grains are spores produced by pollen mother cells present in the pollen sac of the anther.

→ Pollen grain germinates on stigma and produces a slender thin-walled pollen tube, one of its two nuclei divides and forms two sperms.

→ Union of one sperm with the egg in embryosac is called fertilization.

→ Union of second sperm with fusion nucleus is known as double fertilisation.

→ Continuation of life starts from cells either those of the general body or the sex cells.

→ Rudolph Virchow discovered cell division in 1855.

→ Robert Remak in 1852 published observations on cell division.

→ Walther Flemming in 1879 discovered chromosomes that appear double in nature.

→ Wilhelm Roux proposed that chromosomes carried a different set of heritable elements.

→ Gregor Mendel in 1866 published a paper on heritable elements in peas.

→ August Weiseman hypothesised that in successive generations, individuals of the same species have the same number of chromosomes.

→ The scheme of the mitotic division was confirmed in 1904 by Theodor Boveri.

→ The double helix structure of DNA was discovered by Watson and Crick in 1853.

→ The number of chromosomes in man is 46.

→ Cells divide for the growth of the individual to repair and replace the wear out cells and also for the formation of gametes.

→ Cell division is of two types

1. Mitosis or somatic cell division and
2. Meiosis or reproductive cell division.

→ Somatic cells from the body of the organism whereas germ cells participate in reproduction.

→ Interphase can be divided into three phases. They are the G₁ phase, S phase and G₂ phase.

→ Prophase, Metaphase, Anaphase and Telophase are the different stages in mitosis.

→ Meiosis has two phases, during the first phase the parent cell divides twice.

→ The second phase of meiosis is similar to normal mitosis.

→ The division of cytoplasm is Cytokinesis and the division of the nucleus is called Karyokinesis.

→ After mitosis two daughter cells are formed whereas after meiosis four daughter cells are formed.

→ Sexual maturation does not necessarily mean that the body or the mind is ready for sexual acts.

→ Sexual act transmits many diseases like Gonorrhoea, Syphilis and AIDS.

→ Andhra Pradesh has the highest number of HIV patients in the country.

→ Contraception to avoid pregnancy can be achieved by the use of condoms, oral pills, copper-T and surgical methods like Vasectomy and Tubectomy.

→ Teenage motherhood should be avoided.

→ Girls below 18 years of age should not be married.

→ The male and female child sex ratio is declining due to female foeticide.

→ Determination of sex before birth is illegal.

→ As a citizen of India, we should have knowledge of reproductive health not only to control high population growth but also to create a healthy society.

→ Progeny: A genetic descendant or offspring; The young of 1mai and plants.

→ Cyst: A small capsule-like sac that encloses certain organisms in their dormant or larval stage.

→ Fragmentation: Asexual reproductive method in multicellular organisms as in algae. Here the filaments break into parts and each part grows into a new individual.

→ Regeneration: It is the capacity to regenerate the full body from a part of the body of several organisms. eg: Hydra, Planaria.

→ Vegetative propagation: Production of new plants from the vegetative parts such as roots, stems and leaves.

→ Artificial propagation: The process of growing many plants from one plant by man-made methods.

→ Parthenogenesis: It is the process of development of an organism from an unfertilized egg. eg: Drones (Male honey bees).

→ Cutting: A vegetative propagation method in which a piece of stem or root of the source plant is placed in suitable soil to get a new plant.

→ Layering: A vegetative propagation method in which a portion of an aerial stem grows roots while still attached to the parent plant and then detaches as an independent plant.

→ Grafting: lI is a technique of inserting a part of one plant into another plant, that the two will unite and continue their growth.

→ Stock: The portion of the graft which is attached to the soil.

→ Scion: It is the upper part of the union in grafting which has lost its root system.

→ Desirable characters: The features of plants which we like to have in grafting.

→ Tissue culture: Technique used to maintain or grow cells, tissues or organs under sterile conditions on a nutrient culture medium of known composition.

→ Amniotic fluid: Protective fluid (liquid) contained by the amniotic sac of a pregnant female.

→ Placenta: it is the part that connects the developing foetus to the uterine wall to allow nutrient uptake, waste elimination and gas exchange via the mother’s blood supply.

→ Umbilical cord: It is a tube-like structure formed by the allantois membrane of the embryo. It connects the embryo with the placenta.

→ MitosIs: A cell division that occurs in somatic or vegetative cells forming two daughter cells having the same number of chromosomes as in their parental cell.

→ Meiosis: Cell division which occurs in germ cells or reproductive cells forming four daughter cells (gametes) having half of the number of chromosomes when compared to their parental cell.

→ Endometrium: The glandular mucous membrane lining the internal surface of the uterus in mammals.

→ Chromatid: One copy of a duplicated chromosome is generally joined to the other copy by a centromere, for the process of nuclear division.

→ Chromosome: A thread-like structure of nucleic acid (RNA, DNA) and proteins found in cells, carrying genetic information In the form of genes.

→ Foeticlde: It is the act of causing the death of a foetus by destruction or aborting.

→ HIV: Human Immuno Deficiency Virus: A virus that causes immunodeficiency in human beings.

→ AIDS: Acquired Immuno Deficiency Syndrome.

→ Vasctðrny: It Is a surgical procedure (or male sterilization In which a small portion of vas deferens is removed and cut ends are tied.

→ Tubedomy: A surgical procedure for female sterilization In which a small portion of the fallopian tube is removed and the cut ends are tied.

→ Budding: A bud develops as an outgrowth due to repeated cell division at the specific site which after developing into individuals detach from the body of the parent to become new individuals. eg: Hydra.

→ Binary fission: Asexual reproduction method in which an organism split Into two equal halves. Eg: Paramoecium, bacteria.

→ Sporophyll: Leaf that bears sporangia Is called the sporophyte. Eg: Ferns and mosses.

→ Sporangia: A structure within which spores are formed.

→ TestIs: Male reproductive organ which produces spermatozoa or male reproductive cells and male sex hormones.

→ Scrotum: A pouch of skin containing the testicles.

→ Seminiferous tubules: These are the sites In the testis where spermatozoa mature.

→ Vasa efferently: Any of a number of short ducts that carry sperm from the testis to the epididymis.

→ Epididymis: It Is a long, coiled tube that stores sperms and transports them from the testes.

→ Chorlton: It Is the outer membrane of the growing embryo.

→ Amnion: It is the sac-like structure around the embryo.

→ Anti-Retroviral Therapy (ART): It Is a treatment for AIDS disease. It Includes using multiple antiviral drugs in an attempt to control HIV infection.

→ Contraceptive: Any device or chemical which prevents pregnancy in a woman is called a contraceptive.

→ Epicotyl: It is the embryonic shoot above the cotyledons.

→ Hypocotyl: It is the base stem under the spent withered cotyledons.

→ Colostrum: The first secretion from the mammary glands after giving birth, rich in antibodies.

→ PEN: Primary Endospermic Nucleus.

→ Reproduction in animals:

→ Reproduction in plants:

→ Cell Division:

→ Cell Cycle:

→ Methods of Contraception:

→ Flower:

→ Dr. Potu Narasimha Rao:

• Dr Potu Narasimha Reo is a renowned scholar and an eminent cytologist who came from a poor family in Muppalla village of the Guntur district.
• He did his research on the cytogenetics of tobacco plant and cancer cells in a culture medium.
• He conducted researches in cell kinematics and triggering factor of cell division.
• He observed the interphase and its three phases.
• To understand the functional relationship between these phases, he did elegant experiments on cell fusion techniques along with his research associate Dr Johnson.
• His researches revealed that the cell cycle is sequential, unidirectional and controlled by a series of chemical signals.

Students can go through AP State Board 9th Class Physical Science Notes Chapter 7 Reflection of Light at Curved Surfaces to understand and remember the concept easily.

AP State Board Syllabus 9th Class Physical Science Notes Chapter 7 Reflection of Light at Curved Surfaces

→ The concave mirror converges the parallel light beam at one point. So it is called a converging mirror.

→ Convex mirror diverges the parallel light beam. So it is called a diverging mirror.

→ We always get a virtual and diminished image due to a convex mirror.

→ Mirror formula is \(\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\)
f = focal length; u = object distance; v = image distance

→ Focal length is positive for a concave mirror and negative for a convex mirror.

→ The image distance is negative for a real image and positive for a virtual image.

→ The height of the object and height of the image is positive, if measured upward from the axis and negative if measured downwards.

→ Magnification is positive for erect images and negative for the inverted images.

→ Solar cooker works on the principle of converting sunlight at a point due to concave mirror.

→ Magnification: m = \(\frac{\text { size of the image }}{\text { size of the object }}\) (or) \(\frac{\mathrm{h}_{1}}{\mathrm{~h}_{\mathrm{o}}}\)
(OR)
m = – \(\frac{\text { image distance }}{\text { object distance }}=-\frac{v}{u}\)

→ We should use sign convention every time while using the formulae of the mirrors.

→ It is easy to understand the certain properties of light by drawing a ray diagram

→ Curved Surface: The surfaces which are not flat are called curved surface

→ The angle of incidence (∠i): The angle between the incident ray and normal is called the angle of incidence.

→ The angle of reflection (∠r): The angle between normal and reflected rays is called the angle of reflection.

→ Normal: The Pine perpendicular to the surface is called normal.

→ Centre of curvature (C): The normal from a concave mirror converges at a point that point is called the center of curvature.

→ The radius of curvature (R): The distance between vertex and center of curvature is called the radius of curvature.

→ Principal axis (or) Central axis: The horizontal line which passes through the center of curvature and pole.

→ Pole (P) (or) Vertex: The point where the central axis touches the mirror.

→ Focus or focal point (F): The rays coming from distinct objects parallel to the concave mirror will converge at a point called focus or focal point.

→ Focal length (f): The distance between vertex and focus.

→ Object distance (u): The distance between object and mirror is called object distance.

→ Image distance (v): The distance between image and mirror is called image distance.

→ Virtual image The Image formed in the mirror by extending the rays backward is called a virtual image.

→ Real image: The image formed due to the converging of light rays is a real image.

→ Ray diagram: A diagram showing the paths of selected rays through an optical system.

→ Magnification (m): Ratio of the size of the image to the size of the object.

→ Reflection: The bouncing back of the light is called reflection.

→ Incident ray: The ray which is an incident on a surface is called an Incident ray.

→ Reflected Ray: The ray which is reflected from the surface is called a reflected ray.

→ Virtual image: Virtual image ¡s the ¡mage formed due to diverging of light rays.
(OR)
The Image formed due to the extension of rays in the backward direction.

→ Spherical mirror: A mirror that has a curved reflective surface is a spherical mirror.

→ Concave mirror: A spherical mirror whose reflecting surface is curved inwards is called a concave mirror.

→ Convex mirror: A spherical mirror whose reflecting surface is curved outwards is called a convex mirror.

→ Pierre de Fermat:

• A French Lawyer at the Parliament of Toulouse, France, and an amateur mathematician.
• He made notable contributions to analytical geometry, probability, and optics.
• He proposed his principle on the light which states that light selects the path which takes the least time to travel. This principle was famous as the Fermat principle.

Students can go through AP State Board 9th Class Physical Science Notes Chapter 6 Chemical Reactions and Equations to understand and remember the concept easily.

AP State Board Syllabus 9th Class Physical Science Notes Chapter 6 Chemical Reactions and Equations

→ A chemical change is a permanent change.

→ In a chemical change, two substances react chemically to form new substances with different properties.

→ Chemical reactions are characterized by one or more of the following characteristics – the evolution of gas, change of color, formation of a precipitate, energy changes, and change of state.

→ A chemical equation represents a chemical reaction.

→ A complete chemical equation represents the reactants, products, and their physical state.

→ Reactions in which heat energy is absorbed by the reactants are endothermic reactions.

→ In exothermic reactions, heat energy is released by the reactants.

→ A chemical equation is balanced so that the number of atoms of each type involved in a chemical reaction is the same on the reactant and product sides of the equation.

→ Equations must always be balanced.

→ A combination reaction or synthesis is a reaction in which two or more substances combine to form a single substance.

→ A decomposition reaction is one in which a compound breaks up into two or more substances.

→ In a displacement reaction, one element replaces another element from a compound.

→ In a double decomposition reaction, two compounds react by exchanging their radicals.

→ Oxidation is a reaction involving the addition of oxygen or removal of hydrogen from a substance.

→ Reduction is a reaction involving the addition of hydrogen or the removal of oxygen from a substance.

→ Precipitation reactions produce insoluble salts.

→ According to the law of conservation of mass, “Mass can neither be created nor destroyed in a chemical reaction”.

→ The chemical equations are balanced to satisfy the law of conservation of mass in chemical reactions.

→ We should never change the formula of an element or a compound to balance an equation.

→ The process of making the number of different types of atoms equal on both sides of an equation is called the balancing of the equation.

→ All the combustion reactions are exothermic reactions.

→ The substance which gets oxidized is the reducing agent.

→ The substance which gets reduced is the oxidizing agent.

→ Two common effects of oxidation reactions that we observe in daily life are

1. Corrosion of metals
2. Rancidity of food

→ Corrosion causes damage to iron appliances.

→ When fats and oils are oxidized, they become rancid.

→ The precipitate is an insoluble substance.

→ Reactants: The substances which undergo chemical change in the reactions are called reactants.

→ Products: New substances formed in the reaction are called products.

→ Exothermic reaction: Reaction during which heat is released.

→ Endothermic reaction: Reaction in which heat is absorbed.

→ Chemical combination: It is a reaction in which two or more substances combine to form a single substance.

→ Chemical decomposition: It is a reaction in which a compound breaks up into two or more substances.

→ Displacement reaction: More active element replaces less active element from its compound in a chemical reaction.

→ Double displacement reaction: If two reactants exchange their constituents chemically and form two products, then the reaction is called a double displacement reaction.

→ Oxidation: It is a reaction involving the addition of oxygen or removal of hydrogen from a substance.

→ Reduction: It is a reaction involving the addition of hydrogen or removal of oxygen from a substance.

→ Corrosion: Chemical or electrochemical attack the surface of a metal.

→ Rancidity: The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called rancidity.

→ Antioxidants: Substances that prevent oxidation.

→ Chemical equation: A way of denoting a chemical reaction using the symbols for the participating particles (atoms, molecules, ions, etc.).

→ Chemical reaction: A change in which one or more chemical elements or compounds form new compounds.

→ Chemistry: The study of the elements and the compounds they form.

→ Oxidizing agents: Substances that oxidize other substances by providing oxygen to them or removing hydrogen from them.

→ Reducing agents: Substances that reduce other substances by removing oxygen from them or by supplying hydrogen to them.

→ Crystal: A solid in which atoms are arranged in a regular pattern.

→ Tarnish: To make something lose its shine and make it dull because of oxidation or rust.

→ Alloy: A material consisting of two or more metals or a metal and a non-metal. Ex: Steel.

→ Galvanizing: Iron or steel that has been coated with a layer of zinc to protect it from corrosion.

→ Rancid: Sour (or) Stale.

→ Redox reactions: The reactions in which both reduction and oxidation occur simultaneously are called redox reactions in short.

→ Exo: Outside.

→ Endo: Inside.

→ Thermo: Heat.

→ Respiration: When we inhale oxygen, it enters our body and combines with glucose in the cells of our body, and releases energy which helps to do the various works.

→ Henry Cavendish (1731 – 1810):

• Henry Cavendish conducted first his experiments on heat, electricity, and magnetism.
• He showed that water is composed of oxygen and hydrogen.
• He measured heats of fusion and evaporation as well as specific heats and those of the mixing of solutions in water.
• Cavendish’s measurements of the freezing points of various solutions showed the existence of compositions that yield maximum and minimum freezing points
• Cavendish’s experiments included the investigation of capacitance.
• In his experiments, he measured the strength of a current by shocking himself and estimating the magnitude of the pair.

Students can go through AP State Board 10th Class Biology Notes Chapter 5 Coordination to understand and remember the concept easily.

AP State Board Syllabus 10th Class Biology Notes Chapter 5 Coordination

→ Living organisms respond and react to their environment.

→ All our functions are carried out by an effort of several systems working together.

→ The nervous system and endocrine system are the two systems that control and coordinate various functions in the body.

→ The responses of the nervous system can be classified as a reflex, voluntary and involuntary actions.

→ Responses are brought about by rapid changes in some muscles.

→ The human nervous system is studied under two divisions. The central nervous system and the peripheral nervous system.

→ Galen concluded that nerves are of two kinds

1. Those of sensation and
2. Those of action.

→ The neuron is the structural and functional unit of the nervous system.

→ Each nerve cell consists of a cell body, dendrites, and axon.

→ Synapse is the functional region of contact between two neurons.

→ Basing on the pathways followed nerves are classified mainly into three different types.

→ Afferent or sensory nerves carry information from the sense organs to the central nervous system.

→ Efferent or motor nerves carry messages from the central nervous system to parts that or the effector organs.

→ Association neurons link afferent and efferent nerves.

→ Responses on which we may not have control are called reflexes.

→ The existence of the knee jerk was first noted in 1875.

→ The pathway of reflex action is called a reflex arc.

→ The central nervous system includes the brain and spinal cord.

→ The brain is the highest coordinating center in the body.

→ The brain is protected by the cranium.

→ The brain is covered by three membranes called meninges.

→ The space between the membrane is filled with cerebrospinal fluid.

→ The brain has three divisions:

1. Forebrain,
2. Midbrain and
3. Hindbrain.

→ The forebrain consists of the cerebrum, diencephalon.

→ Midbrain has optic lobes.

→ Hindbrain has cerebellum, medulla oblongata.

→ The brain weighs approximately 1400 gms.

→ The spinal cord is a cylindrical structure enclosed within the vertebral column.

→ There are 12 pairs of cranial nerves that arise from the brain and 31 pairs of spinal nerves.

→ The dorsal root carries messages of sensation inwards while the ventral root carries outwards the instruction for muscular contraction.

→ The peripheral nervous system is the network of spinal and cranial nerves that are linked to the brain and spinal cord.

→ Many activities of the internal organs like the heart, blood vessels, and glands are controlled by the autonomous nervous system.

→ Neurons present in our digestive tract is named as small brain and the system is called the enteric nervous system.

→ ‘sugar diabetes is a condition in which the amount of free sugar in the blood and urine is called of the pancreas.

→ The chemical substances produced by endocrine glands are known as hormones.

→ The feedback mechanism regulates the timing and amount of hormones released.

→ Plant hormones or growth substances coordinate the activities of the plant.

→ Major plant hormones are auxins, gibberellins, cytokinins, abscisic acid, and ethylene.

→ Auxins are responsible for cell elongation and differentiation of shoots and roots.

→ Gibberellins help in the germination of seeds and sprouting of buds; elongation of stems and breaking the dormancy in seeds and buds.

→ Abscisic acid helps in the closing stomata and seed dormancy.

→ Cytokinins promote cell division; the promotion of sprouting of lateral buds, delay the aging in leaves, the opening of stomata.

→ Ethylene is useful in ripening fruit.

→ Directional movements in plants in response to specific stimuli like light, chemicals, etc., are called tropic movements.

→ The bending of plants towards light is phototropism.

→ The downward movement of a plant in response to gravitational force is called geotropism.

→ The movement due to chemical stimulus is seen during the pollen tube growth is called chemotropism.

→ Response: Reaction, a reaction to something.

→ Stimuli:

• A thing or event that evokes a specific functional reaction in an organ or tissue.
• Something causing or regarded as causing a response.

→ Neuron: The structural and functional unit of the nervous system.

→ Schwann cell: A cell that forms spiral layers around a myelinated nerve fiber between two nodes of Ranvier and forms the myelin sheath consisting of the Inner spiral layers from which the protoplasm has been squeezed out.

→ Axon: The long projection from the cell body that extends to different parts of our body. The axon is to transmits information to different neurons, muscles, and glands.

→ Synapse: It ¡s the functional Junction between the two neurons through which information is transmitted or relayed to another neuron.

→ Afferent or Sensory nerves: Carry information from the receptor to the association neurons in the spinal cord.

→ Efferent or motor nerves: Carry information from the spinal cord or brain to the effector organs.

→ Association nerves: Process the information and generates responses.

→ Central nervous system: It includes the brain and spinal cord. It coordinates all neural functions.

→ Brain: An organ of soft nervous tissue contained in the skull of vertebrates. It coordinates the center of sensation and intellectual and nervous activity.

→ Spinal cord: Part of the central nervous system that acts as a relay station. It plays a major role in reflex actions.

→ Cerebrospinal fluid: Fluid present between the inner and middle layers. Protects the brain from mechanical shocks.

→ Peripheral nervous system: The nervous system outside the brain and spinal cord. Its main function is to connect the central nervous system to the limbs and organs.

→ Insulin: It Is the hormone produced by islets of Langerhans of the pancreas. It regulates sugar levels in the blood. Its deficiency results in diabetes mellitus.

→ Endocrine glands: These are also known as ductless glands. Their secretion is directly released into the blood (Hormone). They bring about chemical coordination in living organisms. e.g.: Pituitary, Thyroid, Parathyroid, Pancreas, and Adrenal gland.

→ Hormones: The secretion of endocrine glands is a hormone. Chemical coordination is brought out by hormones.

→ Feedback mechanism: It helps the organism to maintain homeostasis or dynamic equilibrium. Homeostasis is the maintenance of a stable internal state within an organism. It regulates the action of hormones.

→ Plant hormones: Coordinate the growth processes of the plant. e.g.:Auxins, Gibberellins, Cytokinins, Abscisic acid, and Ethylene.

→ Tropic movements: When the fixed part of a stationary plant moves in response to a stimulus the reaction is known as a tropic movement.

→ Nastic movement.s: These are non-directional movements or responses to stimuli. e.g.: Temperature, humidity, light, etc.

→ PhototropIsm: Bending of the plant towards the light is called phototropism.

→ Reflex arc: The path followed by a nerve impulse starting from the receptor and finally reaching the effector is called reflex arc; a Structural and functional unit that carries reflex action.

→ Stumble: MomentarIly lose one’s balance; almost fall.

→ MenInges: The three layers covering the brain.

→ Vasomotor: It refers to actions upon a blood vessel that alters its diameter.

→ Autonomous nervous system: Part of the peripheral nervous system that regulates the functions of our internal organs.

→ Enteric nervous system: Nervous system is present in the digestive system, independent of the central or peripheral nervous system.

→ Goosebumps: A roughness of the skin produced by the erection of its papillae especially from cold, fear, or a sudden feeling of excitement.

→ Stumps: The bottom part of a tree left projecting from the ground after most of the trunk has fallen or been cut down.

→ Geotropism: Plant responding positively for gravitational force; Root growing downwards.

→ Hydrotropism: Roots of a plant growing towards the water in the soil.

→ Thigmotroplsm: Tendrils of a plant growing towards support and wind around them.

→ Chemotropism: Response to chemicals is called chemotropism.

→ Voluntary actIon: It occurs without the conscious choice of an organism. If it occurs specifically in response to a stimulus, it will be known as a reflex.

→ Involuntary actIon: It occurs because of choice. It may or may not occur with the awareness of the organism performing it.

→ Lumbar region: It refers to the lower back, where the spine curves inwards towards the abdomen.

→ Aelius Galenus (Galen) – AD. 129-200:

• Galen was a prominent Greek-speaking Roman physician, surgeon end philosopher.
• Galen was the originator of the experimental method in medical investigation.
• He. proved that urine was formed in the kidney.
• His most important discovery was that arteries carry blood. He explained the differences between venous and arterial blood.
• Galen explained the difference between motor and sensory nerves.

Students can go through AP State Board 9th Class Physical Science Notes Chapter 5 What is inside the Atom? to understand and remember the concept easily.

AP State Board Syllabus 9th Class Physical Science Notes Chapter 5 What is inside the Atom?

→ The matter is made up of atoms.

→ According to Dalton, the atom is indivisible. Later experiments proved that an atom is divisible.

→ Atom is electrically neutral.

→ Some small particles which are smaller than atoms are present inside the atom, called subatomic particles.

→ Thomson discovered electrons. These are the negatively charged particles whose mass is negligible.

→ Protons are positively charged particles whose mass is 2000 times that of electrons.

→ Chadwick discovered neutrons, which have no charge and mass nearly equal to that of protons.

→ Thomson developed a model of the atom that shows electrons embedded throughout the mass of positively charged material.

→ Rutherford’s alpha-particle scattering experiment led to the discovery of the atomic nucleus.

→ Rutherford’s model of the atom has a large empty space with a small dense, positively charged nucleus in the center.

→ According to Rutherford, electrons are revolving around the nucleus.

→ Rutherford’s model of the atom could not justify the stability of the atom.

→ Neils Bohr modified Rutherford’s model of the atom by stating that electrons move in specific energy levels around the nucleus.

→ Neils Bohr’s model of atoms could not predict the spectra of heavier atoms.

→ Bohr – Bury proposed some rules for the distribution of electrons in various shells.

→ A maximum number of electrons present in a shell is given by the formula 2n², where ‘n’ is the shell number.

→ The number of electrons present in the outermost orbit of an atom is called its valency.

→ An outermost shell that has 8 electrons is said to possess an octet.

→ An atom with 8 electrons or an octet in its outermost shell is chemically stable.

→ The atomic number is the number of protons in the nucleus of an atom, denoted by ‘Z’.

→ The mass number is the number of protons plus the number of neutrons, denoted by ‘A’.

→ An element can be represented as follows with its atomic number and mass number,
atomic mass number → 19
atomic number → 9

→ Number of neutrons N = A – Z

→ The atoms of the same element which have the same number of protons but have different numbers of neutrons are called isotopes.

→ Some isotopes are used for solving chemical and medical mysteries.

→ Atom: An atom is the smallest particle of an element that can participate in a chemical reaction and retain all its properties.

→ Sub-atomic particles: Experiments proved that atoms were divisible and are made up of smaller particles. These particles are smaller than atoms and are present inside the atom called sub-atomic particles. The three sub-atomic particles are electron, proton, and neutron.

→ Electron: Electrons were the first subatomic particles, discovered by J.J. Thomson, represented by e, having negligible mass and & unit negative charge.

→ Proton: Proton is a positively charged sub-atomic particle that is part of every atomic nucleus. The mass of a proton is 2000 times that of the electron.

→ Neutron: A neutron is an uncharged particle that is part of almost every nucleus. The mass of the neutron is nearly equal to the mass of a proton.

→ Nucleus: All the positively charged material in an atom formed a small dense center, called the nucleus of the atom. The nucleus consists of protons and neutrons.

→ Atomic mass: The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

→ Molecular mass: Molecular mass or molecular weight refers to the mass of a molecule. It is calculated as the sum of the mass of each constituent atom multiplied by the number of atoms of that element in the molecular formula.

→ Formula unit mass: The formula mass of a molecule is the sum of the atomic weights of the atoms in the empirical formula of the compound.

→ Atomic number (Z): Atomic number is the number of protons in the nucleus of an atom, denoted by the letter ‘Z’.

→ Mass number (A): Mass number is the total number of protons and neutrons, denoted by the letter ‘A’. The mass number is the nearest numerical to the mass of an individual atom.

→ Valency: The number of electrons present in the outermost orbit of an atom is called its valency. (OR) The combining capacity of one atom with another atom is known as its valency.

→ Isotopes: Isotopes are atoms that have the same number of protons but a different number of neutrons.

→ Stable atom: An atom with 8 electrons or an octet in its outermost shell is chemically stable and does not combine with other atoms.

→ Octet: An outermost shell that has 8 electrons is said to possess an octet.

→ Inert or noble gases: The gases like He, Ne, Ar, etc. do not react with other elements to form compounds. They are chemically inactive and known as inert or noble gases.

→ Shells: Electrons can be found only in certain energy levels around the nucleus. These energy levels are known as orbits or shells.

→ J.J . Thomson:

• Thomson, Sir Joseph John was born on 18 December 1856 near Manchester, England. He completed his engineering course with the help of his friends.
• In 1897 he was crowned “the father of electrons”. Thomson was a highly gifted teacher. Not less than eight of his students distinguished themselves as Nobel Prize winners. His son won the Nobel prize for physics. He got the Nobel Prize in 1906.

Students can go through AP State Board 9th Class Physical Science Notes Chapter 4 Atoms and Molecules to understand and remember the concept easily.

AP State Board Syllabus 9th Class Physical Science Notes Chapter 4 Atoms and Molecules

→ Mass is neither created nor destroyed during a chemical reaction. This is the law of conservation of mass, established by Antoine Lavoisier.

→ A given chemical substance always contains the same elements combined in a fixed proportion by weight. This is the law of constant proportions, proposed by Joseph L. Proust.

→ Dalton proposed atomic theory. According to this, matter consists of indivisible particles called atoms.

→ Atoms combine to form molecules.

→ Atoms of the same elements combine to form molecules.

→ Atoms of different elements combine to form compounds.

→ Symbols represent elements and formula represents compounds or molecules.

→ A symbol can have either one or two letters of English.

→ The number of atoms constituting a molecule is known as its atomicity.

→ The combining capacity of an element with another element is known as its valency.

→ Ions are single charged atoms or a group of atoms that have a net charge on them.

→ A positively charged ion is a cation and a negatively charged ion is an anion.

→ Scientists use the relative atomic mass scale to compare the masses of different atoms of elements.

→ The number of times one atom of a given element is heavier than 1/12th part of the atomic mass of carbon -12 is called atomic mass.

→ By using the criss-cross method, we can write the chemical formula of compounds.

→ The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of a substance.

→ The formula unit mass of a substance is a sum of atomic masses of all atoms in a formula unit of a compound.

→ One mole of any species is the quantity that is expressed in a number having a mass equal to its atomic or molecular mass in grams.

→ The number of particles present in one mole of any substance is the Avogadro number (Na) which is equal to 6.022 × 10²³.

→ The mass of 1 mole of a substance which is expressed in grams is called its molar mass.

→ Law of conservation of mass: The mass of reactants is equal to the mass of the products of chemical reactions.
(or)
Mass is neither created nor destroyed during a chemical reaction.

→ Law of constant proportion: A given chemical substance always contains the same elements combined in a fixed proportion by weight.

→ Atom: An atom is the smallest particle of an element that can participate in a chemical reaction and retain all its properties.

→ Symbol: Symbol is the short form of representing an element.

→ Atomic mass: The relative atomic mass of the atom of an element is defined as the average mass of the atom, as compared to 1/12th of the mass of one carbon – 12 atom.

→ Atomic mass unit (AMU): One atomic mass unit is defined as mass exactly one-twelfth the atomic mass of carbon – 12 isotopes.

→ Unified mass (u): Unified mass is the unit of atomic mass used in the place of AMU.

→ Molecule: A molecule can be defined as the smallest particle of matter that is capable of independent existence and retained all the properties of that substance.

→ Molecules of elements: Atoms of the same elements or of different elements can join together to form molecules.

→ Molecules of compounds: Atoms of different elements join together they form new substances known as compounds.

→ Formula: Formula is the shortest form to represent a compound.

→ Ion (Cation and Anion): Ion may be a single charged atom or a group of atoms that have a net charge on them. A positively charged ion is called a cation and a negatively charged ion is called an anion.

→ Valency: Every element reacts with other elements according to its combining capacity, which we call its valency.

→ Molecular mass: The molecular mass of substances is the sum of the atomic masses of all atoms in a molecule of a substance.

→ Formula unit mass: The formula unit mass of a substance Is a sum of the atomic masses of all atoms in a formula unit of a compound.

→ Mole: One mole of any species is the quantity that is expressed in a number having a mass equal to its atomic or molecular mass in grams.

→ Avogadro constant: The number of particles present in one mole of any substance is the Avogadro constant (NA). This is equal to 6.022 × 10²³.

→ Molar mass: The mass of 1 mole of a substance which is expressed in grams is called its molar mass.

→ Antoine Lavoisier:

• HewasaFrench nobleman. He made many important contributions to chemistry and some call him the Father of Modern Chemistry.
• Lavoisier studied combustion reactions in detail. For example, during combustion reactions, he not only carefully weighed the solid reactants but also took into account the gases involved. He perfected chemical apparatus which ensured that gases did not escape during the reactions. This led to the law of conservation of mass.

Students can go through AP State Board 7th Class Social Studies Notes Chapter 22 Rulers and Buildings to understand and remember the concept easily.

AP State Board Syllabus 7th Class Social Studies Notes Chapter 22 Rulers and Buildings

→ Monuments provide an insight into the technologies used for construction.

→ Between the seventh and tenth centuries, architects made roofs, doors, and windows by placing a horizontal beam across two vertical columns, a style of architecture called ‘trabeate’ or ‘corbelled’.

→ Between the eighth and thirteenth centuries, the trabeate style was used in the construction of temples, mosques, tombs.

→ The plan of the temples of the Chandela dynasty consisted of an ornamented gateway that led to an entrance and the main hall (maha mandapa) and the main shrine (Garbhagriha) where the chief deity was kept.

→ The Rajarajeshwara temple at Thanjavur had the tallest shikhara amongst temples of its time.

→ The technological and stylistic developments are noticeable from the twelfth century.

→ The weight of the superstructure above the doors and windows was sometimes carried by arches. The roofs too used this principle and were converted into vaults and domes. This architectural style is called ‘arcuate’.

→ The very high-quality cement – the limestone cement was increasingly in the construction. & temples were meant to demonstrate the power, wealth, and devotion of the patron. Temples and mosques were beautifully constructed because they were places of worship.

→ The temples, with the gods and goddesses of the allies and subordinates of the main duty, were miniature models of the world.

→ The kings and nobles endowed the temples with land, gold, and jewels so that worship of the gods could be carried on a grand scale.

→ By 1200 A.D. most of the temples had become elaborate institutions of political and economic power.

→ Constructing places of worship provided rulers with the chance to proclaim their close relationship with God.

→ When the kings attacked another kingdom, they used to target the temples and looted all the valuable gold, jewelry, and golden images of the gods.

→ Sultan Mahmud of Ghazani attacked the temples of defeated kings and looted their wealth and Idols.

→ Vijayanagara kings Rayas built large temples using the style developed by Chola and Pandya emperors which included Vimanas and Gopurams.

→ Inscriptions: Words or symbols – inscribed on a monument, in a book, etc

→ Monuments: A large stone structure built to remind people of a famous person

→ Dynasty: A line of hereditary rulers of a country
(Or)
A succession of people from the same family, play a prominent role in any field

→ Architecture: The art, science, and profession of designing buildings

→ Coronation – Ceremony: It is the ceremony when a new king s officially installed

Students can go through AP State Board 7th Class Social Studies Notes Chapter 16 Making of Laws in the State Assembly to understand and remember the concept easily.

AP State Board Syllabus 7th Class Social Studies Notes Chapter 16 Making of Laws in the State Assembly

→ The legislative assembly is the most important body for making the laws for the state.

→ Our state assembly has 175 members.

→ These members of the Legislative Assembly (MLAs) are elected directly by the people.

→ Each of these 175 members is elected from a constituency. Thus there are 175 constituencies in the state.

→ All men and women of 18 years of age or above have the right to vote.

→ Usually, elections to these state legislative assemblies are held once every five years.

→ Candidates of various political parties and also individuals are known as Independents con-test elections.

→ All political parties come out with election manifestos.

→ Election manifestos are descriptions of programs that parties intend to undertake and promises that are relevant to the local context.

→ Voters have to show their identity cards issued by the election commission.

→ Candidates can cast their vote freely without fear, without getting influenced by the offerings of money or goods offered by the candidates.

→ The candidate who secures the highest number of votes is declared elected.

→ The party which has more than half a number of seats is considered to have got a majority.

→ The members of the majority party will elect one member among themselves as their leader. He will be made the chief minister of the state by Governor.

→ The chief minister will form his cabinet, which is called the government. The cabinet is responsible for implementing laws and developmental plans.

→ In case no single party gets more than half of the seats two or more political parties come together to form a government called the coalition government.

→ If anything goes wrong with a minister, the entire cabinet is responsible for it.

→ The speaker, elected by the MLAs, conducts the assembly meetings.

→ The entire cabinet along with the Chief Minister is responsible to the assembly.

→ The proposed law is called a ‘Bill’. After being passed by both the chambers and approval by the Governor, it becomes a law and is called an ‘Act’ of the legislature.

→ The minister, who introduced the bill, will describe it, in detail in the assembly.

→ A small committee is set up to these suggestions.

→ After the Vidhan Sabha and Vidhan Parishad approve the bell, it will be sent to the Governor for approval. Then it will be called an Act and it published in Gazette.

→ Manifesto: Public declaration of a policy by a party before the election, mostly filled with promises.

→ Cabinet: Council of Ministers along with Chief Minister who held responsible for the Legislative Assembly.

→ Speaker: The Chairman of the Lower House and who leads the proceedings of the House

→ Assembly: A group of people who are elected to make decisions or laws for a particular country, area, or organization.
(OR)
The most important body for making the laws for the state.

→ Ruling party: A party which ¡s ¡n power.

→ Opposition party: The party which ¡s not ¡n power.

Students can go through AP State Board 6th Class Social Studies Notes Chapter 5 Early Life to Settled Life to understand and remember the concept easily.

AP State Board Syllabus 6th Class Social Studies Notes Chapter 5 Early Life to Settled Life

→ Thousands of years ago the people who lived in the sub-continent were called hunter-gatherers. They gathered fruits, edible roots, and tubers, nuts, seeds, leaves, honey, wild grains that grew naturally in the forests. They hunted animals and birds, caught fish, gathered eggs for food. So they got that name. They covered their bodies with skins of animals and leaves.

→ They lived in caves or under tree shades or rock shades. They moved from place to ] place in search of food. Such people are called nomads. Men, women, and children participated in hunting and gathering.

→ The hunter-gatherers discovered fire. It let them cook their food, making it safe to eat. They used fire to keep off wild animals, to light the caves, and to harden the wood. The fire had many uses in the life of hunter-gatherers. So, they considered it sacred.

→ Hunter-gatherers had a wide range of tools made out of stone, wood, and bone. They used those tools to scrape animal skins and to clean the skins. They used stone tools to cut animal flesh and bones. They dug soil for edible tubers and roots with these tools. They prepared spears and arrows for hunting. They hunted animals easily with these tools.

→ Betamcherla and Banaganapalli caves in the Kurnool district seem to have been used by the stone tools using hunter-gatherers as resting places for thousands of years.

→ Hunter-gatherers painted pictures of humans, animals, and hunting scenes on the surface of the rocks. Different color stones were ground and mixed with animal fat to prepare these colors. They used bamboo brushes to paint on rocks.

→ More than 12,000 years ago, the world had started becoming wanner. This was known as the period of great development for humans. In this period, humans changed from food gatherers to growers. Animals like buffalo, ox, sheep, goat, deer, etc., which depend on grass started increasing in number. Man used to domesticate those ani¬mals.

→ As the greenery increased, people started observing the places where edible plants could be found, how seeds broke off stalks, fell on the ground, and new plants sprouted from them. This was the beginning of farming. They cultivated different crops such as rice, wheat, barley, lentil, green-gram, black-gram, etc.

→ Animals such as sheep, goats, buffaloes, oxen, and pigs lived in herds and most of them ate grass. These animals provided milk, meat and some would even carry loads. People protected those animals from the wild animals. This was how they became herders.

→ People realized that seeds took some time to grow – days, weeks, months, and even years. This meant that people had to stay in a place for a long time taking care of the plants, watering them, and protecting them from birds and animals. Due to these reasons, people began to settle down inconvenient places for a longer time.

→ The early farmers needed tools to clear forests by cutting trees. They developed new kinds of stone tools which were called Neolithic stone tools by the archaeologists. This period of early agriculture is called the Neolithic period.

→ During the late Neolithic Age, people made more technological advances. Toolmakers created better farming tools according to their needs.

→ Hunter-gatherers: The people who depend, upon hunting and gathering produce from the forest

→ Herders: Animal rearers.

→ Archaeologist: An archaeologist is a scientist who studies human history by digging up human remains and artifacts.

→ Settled life: Living permanently in one place

→ Stone-tools: Tools made by stones for different purposes

→ Mortars and pestles: Tools used to grind grains and plant products

→ Bronze: It is an alloy of copper and tin metals

→ Domestication: It is the name given to the process in which people grow plants and rear animals

Students can go through AP State Board 10th Class Social Studies Notes Chapter 3 Production and Employment to understand and remember the concept easily.

AP State Board Syllabus 10th Class Social Studies Notes Chapter 3 Production and Employment

→ People are engaged in different activities to earn their livelihoods.

→ These activities are :

1. Agriculture and related activities such as fishing, forestry, mining where nature has a dominant role in the production process.
2. Manufacturing processes and other industries, where goods are produced by people using tools or machines and
3. Those activities that don’t directly produce a good but provide services that are required in production and other services for people.

→ The good becomes final if it is not used further in producing goods to be sold.

→ Gross Domestic Product is the value of all final goods and services produced within a country during a particular year.

→ The unpaid work is done mostly by women even today, in India and across the globe. Community, social and personal services comprise Public Administration, Defence, Education, Health, Veterinary activities, Media, Library, Archives, Museums, and other cultural activities, etc.

→ Finance, Insurance, and Real Estate comprise services of Banks, Post-office Savings Accounts, Non-bank Financial Companies, Life Insurance and General Insurance corporations, Services of brokers and Real Estate Companies, etc.

→ The other service sector division comprises trade, hotels, transport, and communication.

→ The situation of underdevelopment where people are apparently working but all of them are made to work less than their potential.

→ This kind of unemployment is hidden in contrast to someone who does not have a job and is clearly visible as unemployed. Hence it is called ‘disguised unemployment.

→ 92% of workers in India are found in the unorganized sector and only 8% find work in the organized sector.

→ Places of work of organized sector are registered by the government and have to follow its rules and regulations.

→ The unorganized sector is characterized by small and scattered units which have remained largely outside the control of the government.

→ Nearly 80% of rural households in India are in the small and marginal farmer category. During 2004-05, 92% of all workers contributed 50% of GDP whereas only 8% of people had decent employment and contributed 50% of GDP.

→ We should invest in many industries, in both rural and semi-urban areas, so that we are able to produce many more goods and services.

→ We not only have to generate new employment opportunities but also train many workers to work efficiently and with machines.

→ Gross Domestic: It is the value of all final goods and services produced within a Product country during a particular year.

→ Final Goods: The goods become final if they are not used further in producing goods to be sold.

→ Sectoral Goods: The goods produced In three sectors i.e., Agricultural, Industrial and Service sectors.

→ Employment shifts: In 1972-73 the shares of employment in Agricultural, Service and Industrial sectors were 74%, 15% and 11% whereas In 2009-10 they were 53%, 25%, and 22% respectively. This phenomenon is known as the employment shift.

→ Organized sector: Enterprises or places of work where the terms of employment are regular and therefore, people have assured work.

→ Unorganized sector: Small and scattered units where Jobs are low-paid and not regular and have remained largely outside the control of the government.

→ Financial year: A period of twelve months over which the accounts and taxes of a company or a person are calculated. For example, April 2017 to March 2018 Is called financial year 201 7-18.

→ Occupation: DIfferent activities In which people are engaged to earn their livelihood.

→ Primary sector: Agriculture and related activities such as farming, fishing, forestry, mining where nature has a dominant role In the production process.

→ Secondary sector: Manufacturing processes and other industries, where goods are produced by people using tools or machines.

→ Service sector: Those activities that don’t directly produce a good but provide services that are required in production and other services for people.

→ Unpaid work: Work done at home like cooking, cleaning, organizing, bringing up children, etc. does not involve In any monetary transaction.

→ Employment: Individuals are gainfully engaged In productive work or service,

→ Unemployment: Individuals are not gainfully employed In any productive work.

→ Underemployment: The state of each one Is doing some work and no one is fully employed.

→ Disguised Unemployment: The situation of under-employment where people are apparently working but all of them are made to work less than their potential.