When a sample of soil is mixed in beaker with some water, a layer of the soil always floats on top. This layer is called humus. What is it composed of ?

Bigger but lighter clay particles

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dust

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waste products

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dead remains of plants and animals

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Solution

The correct option is D
dead remains of plants and animals

Humus is the lightest layer of the soil profile and floats on top of water. It is composed of dead and rotting remains of animals and plants which also helps in increasing the quality of soil and making it more suitable for plant growth.

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Humus is the dead and decaying bits of animals and plants present in the topmost layer of soil. True or false?

The layer of soil which is not rich in humus but rich in minerals is ___ .

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