Chapter -13

Our water resources

Back exercise question.

Question 1: Why is water essential for life?

Answer 1: Water is essential for life because we need water to drink, cook food, wash clothes and do many other things. Farmers also need water to grow crops.

Question 2: List five sources of water.

Answer 2: Rain, groundwater, ponds, lakes, rivers, seas, oceans.

Question 3: What are the different means of irrigation used in India.

Answer 3: The different means of irrigation used in India are wells, tube wells, canals, tanks and sprinklers.

Question 4: How are dams useful to us?

Answer 4: The dams are useful to us in the following ways.

1. It generates hydroelectricity.

2. It provides water for irrigation.

3. If controls floods.

Think and answer

Question: What will happen to the groundwater reserves in an area where it

a. rains heavily?

b. does not rain much?

Answer: a. In an area where it rains heavily more water will seep into the ground and raise the ground water reserves. This will increase the water supply in an area.

b. In an area where it does not rain much less water will seep into the ground and the lower the ground water reserves. This will lead to water shortage.