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SAI International School
Subject - Chemistry

Class - VII
Topic - SOIL: A Natural Resource
Sub-topic - Formation & Composition of Soil, Soil Profile, Types of
Soil

PRACTICE WORKSHEET

Q. No. Questions Skill Marks
1. The correct sequence of layers in a soil profile (from top to bottom) R 1
is:
(a) Topsoil, subsoil and bedrock
(b) Subsoil, topsoil and bedrock
(c) Bedrock, topsoil and subsoil
(d) Topsoil, bedrock and subsoil
2. Humus is an important part of soil because it ___________. R 1
(a) Helps clay particles to stick together.
(b) Increases the ability of sand to hold water.
(c) Makes the soil fertile.
(d) Helps in nitrogen fixation.
3. This horizon provides shelter to many decomposers. A 1
(a) O-horizon
(b) A-horizon
(c) E-horizon
(d) B-horizon
4. 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): Paddy grows best in clayey soil.
REASON(R): Water logging is common in soils rich in clay.

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