Organisms and Populations Question 29
29. 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
Show Answer
Answer : c
Hints & Solutions
(c) Deep black soil has high content of clay and humus, which makes it more fertile and productive. Humus is amorphous and colloidal mixture of complex organic substances. It provides fertility to the soil.
