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NCERT Solutions for Class 8 Science - Water - A Precious Resource

Q.1. Mark ‘True’ if the statement is true and ‘False’ if it is false:
(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world.
Ans. True

(b) Water shortage is a problem faced only by people living in rural areas. 
Ans. False

(c) Water from rivers is the only source for irrigation in the fields. 
Ans. False

(d) Rain is the ultimate source of water. 
Ans. True

Q.2. Explain how groundwater is recharged?
Ans. The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called infiltration. The groundwater thus gets recharged by this process.

Q.3. There are ten tube wells in a lane of fifty houses. What could be the long term impact on the water table?
Ans. If ten tube-wells in a lane of fifty houses are situated, the groundwater will get used for the domestic purpose. This results in depletion of groundwater level and water table would go down.

Q.4. You have been asked to maintain a garden. How will you minimize the use of water?
Ans. We can reduce the usage of water for gardening by adopting drip irrigation method. In this method, water will reach the roots of the plant drop by drop, which will reduce the wastage of water.
NCERT Solutions for Class 8 Science - Water - A Precious Resource

Drip Irrigation


Q.5. Explain the factors responsible for the depletion of water table.
Ans. Factors responsible for the depletion of the water table are as follows
(i) Increase in population: Increase in population leads to increased demand for water for domestic and drinking purpose. This reduces the water table.
(ii) Industrialisation: Industries need lot of water for manufacturing purposes. This reduces the water table.

(iii) Agriculture: Agriculture requires a lot of water for growing crops; this results in depletion of water table.

Q.6. Fill in the blanks with the appropriate answers:
(a) People obtain groundwater through ______ and ______.
Ans. Wells and tube-wells

(b) Three forms of water are ______, ______ and ______.
Ans. Ice, water and vapor

(c) The water-bearing layer of the earth is ______.
Ans. Hydrosphere

(d) The process of water seepage into the ground is called ______.
Ans. Infiltration

Q.7. Which one of the following is not responsible for water shortage?
(i) The rapid growth of industries
(ii) Increasing population
(iii) Heavy rainfall
(iv) Mismanagement of water resources
Ans. (iii) Heavy rainfall

Q.8. Choose the correct option. The total water
(i) In the lakes and rivers of the world remains constant.
(ii) Under the ground remains constant.
(iii) In the seas and oceans of the world remains constant.
(iv) Of the world remains constant.
Ans. (iv) Of the world remains constant

Q.9. Make a sketch showing groundwater and water table. Label it.
Ans. 
NCERT Solutions for Class 8 Science - Water - A Precious Resource  

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FAQs on NCERT Solutions for Class 8 Science - Water - A Precious Resource

1. What is water scarcity?
Ans. Water scarcity refers to a situation when the demand for water exceeds the available supply. It is a widespread issue in many parts of the world, particularly in arid and semi-arid regions. The shortage of water can lead to various problems like inadequate sanitation, poor hygiene, and inadequate food production.
2. How can we conserve water?
Ans. We can conserve water by adopting various measures like fixing leaky faucets, taking shorter showers, using a broom instead of a hose to clean patios and driveways, installing water-efficient appliances, and recycling water. We can also promote rainwater harvesting and groundwater recharge to conserve water.
3. What are the effects of water pollution?
Ans. Water pollution can have adverse effects on both human health and the environment. It can lead to the spread of water-borne diseases, cause harm to aquatic plants and animals, and disrupt the ecosystem's balance. Polluted water can also affect agriculture, as contaminated water can damage crops and reduce soil fertility.
4. Why is water conservation important?
Ans. Water conservation is essential to ensure the sustainable use of water resources. It helps to preserve water for future generations, reduce the demand for water, and minimize the impact of water scarcity. Water conservation also helps to reduce energy consumption and mitigate the effects of climate change.
5. What are the benefits of rainwater harvesting?
Ans. Rainwater harvesting has several benefits, such as reducing the demand for groundwater, protecting the environment, and promoting self-sufficiency in water supply. It also helps to conserve water and reduce water bills. Additionally, rainwater harvesting can lead to a reduction in soil erosion and an increase in groundwater recharge.
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