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Q.

The topsoil contains:


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a

Humus and living organisms only.

b

Humus and soil particles only.

c

Humus, living organisms, and plants.

d

Humus, living organisms, and soil particles. 

answer is D.

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Detailed Solution

Concept- The formation of soil is affected primarily by five different factors. These factors include the parent material used to form the rock, the climate, geographical location, and the variety of living organisms inhabiting an area and time.
Soil is further divided into different layers based on its depth. Topsoil is the uppermost layer of the soil. It consists of humus, the organic material found in soil, living organisms such as earthworms and other microbes and soil particles.
Hence, the correct answer is option 4.
 
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