Water - A Precious Resource Class 7 Worksheet Geography Chapter 5

Q.1. True/False
(i) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world.

True

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

False

(iii) Water from rivers is the only source for irrigation in the fields.

False

(iv) Rain is the ultimate source of water.

True

(v) Bawri was the traditional way of collecting water.

True

Q.2. Fill in the blanks.
(i) People obtain groundwater through ____ and ____.

tube wells, handpumps.

(ii) Three forms of water are ____, ____ and ____.

solid, liquid, gas

(iii)  The water bearing layer of the earth is ____.

aquifer

(iv) The process of water seepage into the ground is called ____.

infiltration

(v) The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of ____ per person per day.

50 litres

Q.3. What is infiltration?

The process of seeping of water into the ground is called infiltration.

Q.4. What is aquifer?

At places the groundwater is stored between layers of hard rock below the water table. This is known as an aquifer.

Q.5. Why is the water cycle important?

The water cycle is important because its process provides Earth with the natural, continual water supply all living things need in order to survive.

Q.6. How is water supplied in town?

Most towns and cities have water supply system maintained by the civic bodies. The water is drawn from nearby lakes, rivers, ponds or wells. The water is supplied through a network of pipes.

Q.7. Why do we celebrate world water day?

We celebrate water day every year to attract the attention of everybody towards the importance of conserving water.

Q.8. What are the main processes involved in the water cycle?

The main processes involved in the water cycle are evaporation, transpiration, condensation, precipitation, runoff, and percolation.

Q.9. What is the source of groundwater?

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.

Q.10. Why is the water cycle important?

Most of the water that we get as rainfall just flows away. This is a waste of precious natural resource. The rainwater can be used to recharge the groundwater. This is referred to as water harvesting or rainwater harvesting.

Q.11. There are ten tube wells in a lane of fifty houses. What could be the long term impact on the water table?

The water table does not get affected as long as we draw as much water as is replenished by natural processes. However, water table may go down if the water is not sufficiently replenished.

Q.12. You have been asked to maintain a garden. How will you minimise the use of water?

We can use drip irrigation to minimise the use of water. Drip irrigation is a technique of watering plants by making use of narrow tubings which deliver water directly at the base of the plant.

Q.13. How can farmer use water economically?

A farmer using water in the field can also use water economically by using drip irrigation technique. Drip irrigation is a technique of watering plants by making use of narrow tubings which deliver water directly at the base of the plant.

Q.14. Explain how groundwater is recharged?

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.15. Why are we left only tiny fraction of water for use even if about 71 % of the earth surface is covered with water?

71% of the earth’s surface is covered with water. Almost all the water on the earth is contained in the seas and oceans, rivers, lakes, ice caps, as groundwater and in the atmosphere. However, most of this water is not fit for human consumption. The water that is fit for use is fresh water.

Q.16. How increasing industries are responsible for depletion of water table?

Water is used by all the industries. Almost everything that we use needs water somewhere in its production process. The number of industries is increasing continuously. Water used by most of the industries is drawn from the ground.

Q.17. What will consequences if water is not available to plants?

Plants need water to get nutrients from the soil to prepare their food. If water is not available to plants, the green character of the planet shall be lost. This may mean the end of all life, for a world without plants shall mean no food, no oxygen, not enough rain, and innumerable other problems.

Q.18. From where do people in villages get water?

Many villages do not have water supply system. There people fetch water directly from the sources. Often women and children have to walk several kilometres to fetch water. The children suffer a lot. They cannot attend school regularly since they spend hours in fetching water. A large number of people draw water from wells, tube wells or hand pumps.

Q.19. Explain the three form of water that exists in nature.

Water exists in three forms: solid, liquid and vapour. The solid form, snow and ice, is present as ice caps at the poles of the earth, snow covered mountains and glaciers. Liquid water is present in oceans, lakes, rivers, and even underground. The gaseous form is the water vapour present in the air around us.

Q.20. List some methods to conserve water.

Methods to conserve water
(i) Repairing leaking supply pipes and taps.

(ii) Judicially using water while brushing teeth, shaving, bathing, washing and during many other activities.

(iii) Water harvesting

(iv) Drip irrigation