WBCS.LIVE practice question

Which part of the soil contains humus?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. A-horizon
  2. C-horizon
  3. Bedrock
  4. B-horizon

Correct answer and explanation

Correct answer: A-horizon

Explanation: The correct answer is A. A-horizon. The A-horizon is also called the topsoil, and it is the most fertile layer of soil. It contains a large amount of humus, which is formed by the decomposition of organic matter like dead plants and animals. This layer is rich in nutrients, supports plant roots, and is crucial for agriculture. It is darker in color due to the presence of humus and has a loose and crumbly texture. The A-horizon lies above the B-horizon and plays a major role in soil fertility and crop growth.