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Deep black soil is productive due to high proportion of 

(a) sand and zinc 

(b) gravel and calcium 

(c) clay and humus 

(d) silt and earthworm.

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Correct option: (c) clay and humus

Explanation:

Deep black soil is productive due to high proportion of clay and humus. The organic matter present in the soil is contributed by the death and decay of living organisms. These are the richest in nutrients and therefore these soils are the most fertile.

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