Question

Which of these does not play a major role in soil formation?

• A. Humus
• B. Parent Rock
• C. Time
• D. Vegetation and other life forms

Answer 1

The correct option is A Humus

Parent rock, time, vegetation, and other life forms play a major role in soil formation. Climate and land relief features also influence soil formation.

Humus is mixed with the soil after formation, and hence does not play a major role in formation process. Plants and small organisms grow, mature, die, and become part of this soil, adding to the humus content of the soil.