Question

When does the soil become fertile?

• A. When the proportion of humus in the soil is lesser than a threshold.
• B. When the proportion of humus in the soil is less.
• C. When the soil has no humus.
• D. When the proportion of humus in the soil is high.

Answer 1

The correct option is D When the proportion of humus in the soil is high.

If the proportion of humus in the soil is greater, the soil become fertile.