Page 148 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

C. State whether the following statements are true (T) or false (F).

1. Water vapours present in the air join with dust particles to form clouds.
2. Water cycle does not involve rainwater harvesting.

3. Drip irrigation is a way to use water economically.
4. Playgrounds without any grass inhibit the seepage of rainwater into the ground.

5. The water table separates the groundwater zone that lies below it from the capillary
fringe or the zone of aeration, that lies above it.

6. 10% of people depend on rain for water.
7. Baobab tree can store thousands of litres of water in its trunk.

Ans. 1. (T) 2. (T) 3. (T) 4. (T) 5. (T) 6. (F) 7. (T)
D. Match the following.

Column A Column B
1. Groundwater (a) Solid form of water

2. Baori (b) Wastage of water
3. Snow (c) Efficient method of watering crops

4. Drip irrigation (d) Traditional way of collecting water
5. Leaking taps (e) Water table

Ans. 1. (e) 2. (d) 3. (a) 4. (c) 5. (b)
E. Very short-answer questions

1. Mention three causes of water scarcity in our country.
Ans. Three causes of water scarcity in our country are: overexploitation of water resources,

pollution of water bodies and uneven distribution of rainfall.
2. State the factors affecting the level of water in a water table.

Ans. The factors affecting the level of water in a water table are: amount of precipitation,
rate of groundwater extraction and rate of infiltration and percolation.

3. Name the process responsible for the maintenance of water on the Earth.
Ans. The water cycle (hydrological cycle).

4. State the various uses of water.
Ans. The various uses of water are: drinking, cooking, agriculture, irrigation, industrial

processes, household cleaning, sanitation and recreational activities.
5. What is the main objective of celebrating ‘World Water Day’?

Ans. The main objective of celebrating ‘World Water Day’ is to raise awareness about
the importance of water and to advocate for the sustainable management of water

resources.
6. Which year was celebrated as ‘International Year of Freshwater’?

Ans. 2003

148