Sub :- EVS Topic Ch 7 Water (Notebook work)

 

CH-7 WATER

►New words

1. Diseases

2. Dengue

3. scarcity

4. pollution

5. disposing

►word galaxy

1. glaciers- body of ice that is constantly moving due to its own weight

2. contamination- making impure or unclean.

3. fertilisers- chemical used to improve plant growth.

 

 Ex.1 Answer the following questions in one sentence.

Q.1 What is potable water?

Ans1- Safe drinking water is called potable water.

Q.2 In which part of India are taanka’s used for rainwater harvesting?

Ans2. taanka’s used in place like Rajasthan.

Q3. What does ‘scarcity of water’ mean?

Ans 3 Shortage of water is called water scarcity.

Q4. What is the process of water turning into water vapour and then back to water called?

Ans4. Water circulates on the Earth in a series of processes called the water cycle.

Ex.2 answer the following questions in 2-3 sentences.

Q1. State any two methods used to prevent water pollution.

Ans. 1. Reducing the use of fertilisers for farming.

         2. Not disposing garbage in water.

Q2. How are clouds formed?

Ans2. The tiny droplets of water come into contact with tiny particles of dust and form clouds.

Q3. Write three ways of saving water?

Ans3. Reducing water pollution, Rainwater harvesting , recycling waste water

Q4. List any four methods that can be used to reduce wastage of water.

Ans 4      1. fix leaking taps  2. turn off taps   3. use bucket and mug for bathing 4. Use bucket of a water to wash car.

Ex-3 Give reasons for the following statements.(HOTS)

1. Water should not be stored for a long time at our homes.

ans-1 Water should not be stored for a long time at our homes as mosquitoes that cause dengue and malaria lay eggs in stored water and cause diseases.

2. we must save water.

ans-2 we must save water by reducing its wastage, reducing waterpollution and educating people about effects of water scarcity.