Water: A Precious Resource Class 7 Extra Questions and Answers Science Chapter 16

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Class 7 Science Chapter 16 Extra Questions and Answers Water: A Precious Resource

Extra Questions for Class 7 Science Chapter 16 Water: A Precious Resource with Answers

Water: A Precious Resource Class 7 Extra Questions Very Short Answer Type

Question 1.
When is the World Water Day celebration?
Answer:
22 March.

Question 2.
What is minimum limit of water prescribed by United Nations?
Answer:
The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 litres per person per day.

Question 3.
How much of earth’s surface is covered by water?
Answer:
About 71%.

Question 4.
How much water (by percentage) is available for us to use?
Answer:
Roughly 0.006%.

Question 5.
Where is solid form of water present in the earth?
Answer:
The solid form, snow and ice, is present as ice caps at the poles of the earth, snow- covered mountains and glaciers.

Question 6.
How is water present in the atmosphere?
Answer:
As water vapour.

Question 7.
What is Bawril
Answer:
Bawri is the traditional way of collecting water.

Water: A Precious Resource Class 7 Extra Questions Short Answer Type 1

Question 1.
Which year was observed as International Year of Freshwater and why?
Answer:
Year 2003 was observed as the International Year of Freshwater to make people aware of this dwindling natural resource.

Question 2.
Where is most of the water in earth contained?
Answer:
Almost all the water on the earth is contained in the seas and oceans, rivers, lakes, ice caps, as groundwater and in the atmosphere.

Question 3.
Give two tips to save water.
Answer:

1. Turn off taps while brushing.
2. Mop the floor instead of washing.

Water: A Precious Resource Class 7 Extra Questions Short Answer Type 2

Question 1.
What could be the effect of scarcity of water?
Answer:
Without water, no animals and plants can survive. The green character of the planet shall be lost. For a world without plants shall mean no food, no oxygen, not enough rain, and innumerable other problems. This may mean the end of all life.

Question 2.
How is water distributed on the earth in its three forms?
Answer:

1. The solid form, snow and ice, is present as ice caps at the poles of the earth, snow-covered mountains and glaciers.
2. Liquid water is present in oceans, lakes, rivers, and even underground.
3. The gaseous form is the water vapour present in the air around us.

Water: A Precious Resource Class 7 Extra Questions Long Answer Type

Question 1.
Write some methods to save water.
Answer:
Scarcity of water can be tackled only through its judicious use. We cannot create water but can save water. Here are some tips for saving water:

1. While brushing teeth or shaving turn off the water tap until it is time to rinse.
2. Use a bucket of water while washing dishes instead of washing them under the tap.
3. Never put water down the drain when there may be another use for it such as watering a plant in the garden or cleaning.
4. Verify that your home is leak-free. Repair any leakage.
5. Use minimum water for bath. If there is shower in the bathroom, use the ultra-low-flow version and take short showers.
6. Avoid the installation of ornamental water features (such as fountains) unless the water is recycled.
7. Report all significant water losses (broken pipes, open hydrants, etc.) to the property owner or authorities.
8. Do not pollute water.

Question 2.
How is increasing population responsible for depletion of groundwater?
Answer:

1. Increasing population creates demand for construction of houses, shops, offices, roads and pavements. This decreases the open areas like parks, and playgrounds. This, in turn, decreases the seepage of rainwater into the ground.
2. Moreover a huge amount of water is required for construction work. Often groundwater is used for this purpose.
3. So, we are not only consuming more groundwater, but we also are allowing lesser water to seep into the ground. This results in depletion of water table.

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