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Given below are two statements:

Assertion (A): Human body is incapable of digesting cellulose.

Reason (R): Starch degrading enzyme, diastase, is found in the human body.

Choose the correct answer from the code given below:


1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true

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Correct Answer - Option 2 : Both (A) and (R) are true but (R) is not the correct explanation of (A)

The correct answer is Both (A) and (R) are true but (R) is not the correct explanation of (A).

  • Humans are unable to digest cellulose because the appropriate enzymes to breakdown the beta acetal linkages are lacking.
    • Undigestible cellulose is the fiber that aids in the smooth working of the intestinal tract
  • In the digestive systems of humans and many other mammals, an alpha-amylase called ptyalin is produced by the salivary glands, whereas pancreatic amylase is secreted by the pancreas into the small intestine.
    • The optimum pH of alpha-amylase is 6.7–7.0.
  • Hence, option 2 is correct.

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