AP Board 4th Class EVS Solutions 6th Lesson Water

Andhra Pradesh AP Board 4th Class EVS Solutions 6th Lesson Water Textbook Exercise Questions and Answers.

AP State Syllabus 4th Class EVS Solutions Lesson 6 Water

I. Conceptual Understanding:

Question 1.
Why do we need tanks?
Answer:

1. Tanks are mainly used for agriculture and drinking.
2. Tanks are source of drinking water to the cattle.
3. Tanks also help to increase the ground water.

Question 2.
How are tanks being polluted?
Answer:
Tanks ae being polluted by following reasons:

1. Taking bath washing cattle, clothes and vehicles in the tank.
2. Throwing household waste and dead bodies of animals into the tank.
3. Using of tanks for toilet purpose.
4. Immersing idols made with chemicals.
5. Passage of sewage water from houses in to the tank.
6. Chemical effluents from factories also pollute the tank.

Question 3.
How should we conserve our tanks?
Answer:

1. We should remove the weeds in the tank and canals.
2. We should remove Gurrapudekka and algae grown in the tanks.
3. We should increase the level of water in the tank by removing soil deposits from tank.
4. We should not pollute our tank by our activities.
5. We should pass the rain water into tanks.

II. Questioning and Hypothesis:

Question 4.
Ask your teacher what will happen if all the tanks dry up.
Answer:

1. What will happen if all tanks dry up?
2. How would you get water for drinking ?
3. Is there any other resources of water, if all tanks are dry up?
4. Is ground water available if all tanks are dry up?

III. Experiments and field observations:

Question 5.
With the help of your teacher, visit a near by field, observe how water is supplied to the fields. Draw a block diagram.
Answer:
1. I observed that outlets are there on both sides of the tank.
2. Water flowing from those outlets is set into small canals across the field.
3. Each farmer dig a small hole to his field from the small canals.
4. After filling his field he close the hole to stop the water.

IV. Information Skills & Project work:

Question 6.
Collect information about a tank and write the history of tank?
Answer:
Brahmayya Lingain Cheruvu:

Brahamayya Lingam cheruvu is located in chikkavaram village in krishna district. This is spread across 1,000 acres and is said to be constructed by “Chola” kings . It is capable of providing drinking and irrigation water to almost 6 viilages. The lake is filled with rain water.Now itis planned to filled with water through Polavaram canal. AP government is planning to develop this as a tourist spot.

V. Drawing Pictures and Model Making:

Question 7.
Prepare a chart showing water cycle.

Answer:
Student activity.

VI. Appreciation:

Question 8.
Prepare some slogans to stop pollution of water?
Answer:

1. Water is to drink – not to pollute
2. Clean water – Healthy life.
3. Go green – Drink clean.
4. If you pollue water – You pollute life.
5. Our water – Our future.

Think and Discuss:

Question 1.
What will you do to stop pollution of water in tanks?
Answer:
To stop pollution of water in tanks:

1. By removing Gurrapudekka and algae grow in the tank regularly
2. We will not take bath, wash clothes or vehicles in tank.
3. We will not throw the house hold wastes and animals dead bodies in to the ta’nk.
4. We will not pass our sewage water in the tank.
5. Chemical effluents from factories will not let into the tank.

Question 2.
Low rainfall and closing of water channels are the main cause forr drying of tanks. Discuss other possible reasons for the drying up of tanks?
Answer:

1. Increased diversion for irrigated agriculture.
2. Building Of dams.
3. Over extraction and mismanagement of tanks. Are the other reasons for the drying up of tanks.

Activity: (TextBook Page No.54)

Take six glasses and fill them with equal amount of wa ter. Now put the following thing into the water, stir with spoon. Write your observation in the table by putting (✓) mark.

Answer:

Additional Questions:

Question 1.
What are the different kinds of water resources are available in your village?
Answer:

• Bore well
• Tap water
• River water and mineral water plant are different resources available in our village.

Question 2.
How is a water tank built?
Answer:

1. The villagers identify the source of flood water and a low laying area for the construction of a tank.
2. They dig the tank and construct tank bunds for storage.
3. Then they dig the canals from the regions where the water is flooding to the tank.
4. Outlets from the tank are built on both sides.

Question 3.
Why do tanks have outlets (canals)?
Answer:

1. Some tanks are connected with other tanks with the help of canals. Water flows from one tank to another in rainy season.
2. Canals are dug to fill the tanks with river water.

Question 4.
Can we drink water directly from the tank? Is it safe?
Answer:

• No, it is not safe to drink water directly from the tank.
• The water is polluted we get diseases like typhoid, cholera and diarrhea by drinking water directly from the tank.

Question 5.
How is drinking water supplied in village?
Answer:

1. The village panchyat is responsible for the supply of pure drinking water in villages.
2. Overhead tanks are built under the rural water schemes.
3. The fil tered and safe water is supplied to the houses.

Question 6.
Draw a block diagram of water treatment plant?
Answer:

Question 7.
What is chlor ination? How it helps?
Answer:
Adding of bleaching powder to the water is called chlorination. It helps to kill the germs ini water.

Question 8.
What happens lin the sedimentation tank?
Answer:
In sedimentation tank the sand particles are settle down in the tank. Solid particles like leaves, twigs etc are removed.

Question 9.
In the process of purification of water, what happen in Alteration tank?
Answer:

1. The water is filtered in filteration tank.
2. Small particles are removed from the water.

Question 10.
What is evaporation?
Answer:
The process of changing of water into watervapour is called evaporation.

Question 11.
What is “water cycle”?
Answer:
Water evaporates from the surface of the earth and forms clouds. The clouds get cold and fall again to the surface in the form of rain. This continuous cycle is called” The water cycle”.

Question 12.
Which give taste to the water?
Answer:
Some substances in the soil dissolve in water and gives taste to water.

Question 13.
What is condensation?
Answer:
The process of changing of water vapour into water is called condensation.

Multiple Choice Questions:

Choose the correct answer:

Question 1.
The process of changing of water into water vapour is called ________.
A) Evaporation
B) Condensation
C) Precipitation
D) Water cycle
Answer:
A) Evaporation

Question 2.
The procese of changing of water vapour in to water is called ________.
A) Evaporation
B) Condensation
C) Precipitation
D) Watercycle
Answer:
B) Condensation.

Question 3.
In _______ tank sand particles are settle down.
A) Filtration
B) Chlorination
C) Sedimentation
D) None
Answer:
C) Sedimentation

Question 4.
In _______tank bleaching powder is added to the water.
A) Filtration
B) Chlorination
C) Sedimentation
D) All
Answer:
B) Chlorination

Question 5.
Over head tanks in villages are built under ________ Schemes.
A) Rural water
B) Urban water
C) Irrigation
D) Village development
Answer:
A) Rural water

Question 6.
________ cause water pollution.
A) Chemicals from factories
B) House hold wastes
C) Washing clothes and cattles in water sources
D) All
Answer:
D) All

Question 7.
We get following disease by drinking water directly from the tank.
A) Typhoid
B) Cholera
C) Diarrhea
D) All
Answer:
D) All

Question 8.
Water drops fall from clouds is called ________.
A) Evaporation
B) Condensation
C) Precipitation
D) Watercycle
Answer:
C) Precipitation

Question 9.
Which of the following did not dissolve in water.
A) Sugar
B) Oil
C) Salt
D) Milk
Answer:
B) Oil