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5. DIRECTION: Each of these questions contains an Assertion A 1
followed by Reason. Read them carefully and answer
the question on the basis of following options. You have to
select the one that best describes the two statements.
a) If both Assertion and Reason are correct and Reason is
the correct explanation of Assertion.
b) If both Assertion and Reason are correct, but Reason is
not the correct explanation of Assertion.
c) If Assertion is correct but Reason is incorrect.
d) If Assertion is incorrect but Reason is correct.
e) If Assertion & Reason both are incorrect.

ASSERTION (A): Microbes are the important component of the soil.
REASON(R): Microbes help to decompose dead plants and animals
into humus.
6. Distinguish between sandy, clayey and loamy soil on the basis of K 3
the following points:
(i) Composition
(ii) Particle size
(iii) Water holding capacity
7. (a) What is humus? K 3
(b) What is bedrock?
(c) What is the importance of the topsoil?
8. To make roads, people break large rocks into smaller ones. HOTS 3
a) Can this be called weathering of rocks?
Give reason to your answer.
b) What are the different agents involved in weathering? Explain.

9. Deepak had been taught to make toys by moulding wet clay. He HOTS 5
tried to make toys with the soil near his house. But the soil particles
did not stick together.
(a) What kind of soil do you think is there near Deepak’s house?
(b) Why is it not suitable for making toys?
(c) Why is clay suitable for making toys?
(d) What crop grows best in clayey soil?
(e) Why does the crop in (d) grow best in clayey soil?
10. Answer the following questions with reference to Soil Profile. K & A 5
(a) What do you mean by soil profile?
(b) Which is the lowermost layer of the soil profile?
(c) Describe E-Horizon of the soil profile.
(d) What is the A-Horizon made up of?
(e) In which horizon does the rain water get collected?

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