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

Light clay particles

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Small rocks

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Sand particles

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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 soil profile and floats on top of water. It is composed of dead and decomposing remains of animals and plants. It helps increase the quality of soil by adding nutrients to it. It makes the soil 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?

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