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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Humus undergoes decomposition at an extremely fast rate, rapidly releasing inorganic nutrients into the soil. Reason (R): Humus is a dark-coloured, amorphous, colloidal substance that is highly resistant to microbial action. In the light of the above statements, choose the most appropriate answer f

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DAssertion is false but Reason is true.

Correct answer

D. Assertion is false but Reason is true.

Step-by-step solution

Humification leads to the accumulation of a dark-coloured amorphous substance called humus. According to NCERT, humus is highly resistant to microbial action and undergoes decomposition at an extremely slow rate. Being colloidal in nature, it serves as a reservoir of nutrients. Therefore, the Assertion is incorrect because humus decomposes very slowly, not at a fast rate. The Reason is a correct statement as it accurately describes the physical and biological properties of humus. Thus, Assertion is false but Reason

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