Question
Biology Question on organisms and populations
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.
Answer
clay and humus
Explanation
Solution
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.