Explain how soil is formed.

3

(a)

How is clayey soil useful for crops?

3

(a)

List the differences between clayey soil and sandy soil.

3

(a)

Explain how soil pollution and soil erosion could be prevented.

3

(a)

Suppose certain sample takes 120 min for 960 mL water to percolate into the soil. Calculate the rate of percolation of water.

3

(a)

Describe how clayey soil is useful for crops?

3

(a)

Describe the different type of soil

3

(a)

A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not big beyond a depth 5 feet. Provide a suitable scientific explanations

3

(a)

Observe the following figure and answer the following questions.
(a) Which is the heaviest rock material?
(b) Which is the lightest soil component?
(c) Why are different layers of soil component formed?

3

(a)

During the summer vacations, Gaurav visited his native village. He observed that farmers were using pesticides in their field. He contacted the village head and explained him the effects of such substances in causing soil pollution. Next day, the. village head called a meeting of all the villagers and convinced the villagers not to use chemicals and pesticides.
(a) Why is there a ban to demand the polythene bags and plastics.
(b) List some substances which pollute the soil.
(c) What are the values shown by Gaurav?

3

(a)

Write the difference between rate of percolation and the amount of water retained

3

(a)

Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. Give reasons

3

(a)

Describe in brief the steps followed in making earthen pots.

3

(a)

Unscramble the following jumbled words related to soil

3

(a)

Soil is very important for the living beings? Justify.

3

(a)