Question

Deep ***** soil is productive due to high proportion of

(a) sand and zinc

(b) gravel and calcium

(c) clay and humus

(d) silt and earthworm

Answer 1

Correct option: (c) clay and humus

Explanation:

Deep ***** soil has high content of clay and humus, which makes it more fertile and so productive. Humus is amorphous and colloidal mixture of complex organic substances. It provides fertility to the soil.