Students can go through AP Board 7th Class Science Notes 7th Lesson Reproduction in Plants to understand and remember the concept easily.
AP Board 7th Class Science Notes 7th Lesson Reproduction in Plants
→ Giving rise to new ones of their own kind is called reproduction.
→ Reproduction helps to increase their number and continue their existence.
→ All plants produce new ones like them. There is no existence for plants without reproduction.
→ Reproduction with seeds is called sexual reproduction. Reproduction in plants without seeds is called asexual reproduction.
→ In some plants sexual reproduction occurs through some vegetative parts like stem, roots and leaf.
→ Suckers, nodes, eyes and underground stems are some vegetative propagation methods. Ground layering, grafting are some artificial vegetative propagation methods.
→ Flower is the sexual part of plant it has calyx, corolla, stamens and pistil.
→ The flower which has four whorls are called complete flower.
→ In some plants androecium or gynoecium is present. Such flowers are called Unisexual flowers.
→ The flowers which have both androecium and gynoecium is called bisexual flowers.
→ Unisexual flowers that contain only androecium are called male flowers.
→ Unisexual flowers that contain only gynoecium are called female flowers.
→ Colour, smell and nectar of a flower helps to attract insects.
→ The process of transferring pollen grains from the anther to stigma, is known as polli-nation.
→ Pollination is two types.
- Self Pollination
- Cross Pollination.
→ Pollen grains reach the stigma of flower through insects, birds, air and water.
→ Fusion of male and female garnets to form zygote is called Fertilization.
→ Zygote is formed through the fertilization later it develops in embryo.
→ After fertilization the ovary ripens and grows into a fruit.
→ Generally seeds dispersal through air, water and by animals.
→ All plants try to spread their seeds to distant places in increase the chance of survival and propagation.
→ Reproduction is the process which justifies the maximum life is immortal.
→ Reproduction : The process of giving rise to new ones of their own kind is called Reproduction.
→ Vegetative propagation : Propagation of plants through vegetative parts like stem, roots and leaf is called ’vegetative propagation’.
→ Unisexual flowers : Flowers with either androecium or gynoecium are called unisexual flowers.
→ Bisexual flowers : Flowers with both androecium and gynoecium are are called as bisexual flowers.
→ Androecium : The male reproductive part of the flower is called Androecium. It consists of stamens.
→ Gynoecium : The female reproductive part of the flower is called Gyno¬ecium. It consists of ovary , style and stigma.
→ Anther : Swollen structure at the top of the stamen is called An¬ther. It produces pollen grains.
→ Pollination : The process of transferring pollen grains from anther to stigma is called as Pollination.
→ Pollen grain : Male gametes of the plants are called pollen grains. They appear like smooth yellow powder. They are formed in the anther.
→ Ovary : A bulged structure seated on the thalamus is called Ovary. It’s a part of Gynoecium – the female reproductive part of the flower. It contains ovules.
→ Fertilization : Fusion of male and female gametes to form zygote is called fertilization. This is the process of formation of zygote.
→ Zygote : Zygote is the cell formed due to fertilization. It develop into embryo and then baby.
→ Seed dispersal : Spreading of seeds from one place to other is called seed dispersal. It increases the chances of survival for the plants.