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CHAPTER 4: SOIL
TOPIC – IMPORTANCE OF SOIL, ITS FORMATION AND LAYERS
Objective questions:
Q1) Fill in the blanks:
a) ___________is the part of the soil that is made of decayed organic materials.
b) Process of formation of soil by breaking of rocks is called ____________.
c) __________ acts as a medium for the growth of plants.
d) Soil consists of ____________ different layers.
e) Weathering is a __________ process.
Q2) From top to bottom, how is soil layered?
a) subsoil, topsoil, bedrock
b) topsoil, bedrock, subsoil
c) bedrock, subsoil, topsoil
d) topsoil, subsoil, bedrock
Q3) Bedrock can be found in the A horizon.
a) True
b) False
Q4) What are the two main processes that break down rocks during soil formation?
a) Inhaling and exhaling
b) Stomping and mashing
c) Weathering and erosion
d) Falling and rising
Subjective questions
Q1) How soil is important in supporting life on earth? Does soil have a role other than
supporting life?
Q2) Which of the layers shown in the figure contains humus? Name the layers.
