Humus is found in:

Top portion of soil

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Middle portion of soil

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Deep portion of soil

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All layers of soil

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Solution

The correct option is A Top portion of soil
Humus is found at the top of the soil structures. It is dark coloured and spongy, which is rich in mineral and organic matter and shows maximum biological activity. It is formed by the decomposition of leaves and other plant material by soil microorganisms.
So, the correct option is A.

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