Cellulose-rich food substances are a good source of roughage in human beings because

Cellulose absorbed in the human blood and converts into fibres

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The cellulose-digesting bacteria convert cellulose into fibres

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Human beings do not have cellulose-digesting enzymes

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Cellulose breaks down into smaller components which are egested as roughage

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Solution

The correct option is C
Human beings do not have cellulose-digesting enzymes

The correct option is C.
Explanation of the correct option:
Cellulose-rich food substances are a good source of roughage for human beings because human beings do not have cellulose-digesting enzymes.
Humans do not have the enzyme cellulase to degrade the beta-1, 4 glycosidic bonds of cellulose.
So humans are unable to digest cellulose.
Final Answer: Cellulose-rich food substances are a good source of roughage in human beings because human beings do not have cellulose-digesting enzymes.

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Question 12
Cellulose-rich food substances are good source of roughage in human beings because

(a) Human beings do not have cellulose-digesting enzymes
(b) Cellulose gets absorbed in the human blood and converts into fibres.
(c) The cellulose-digesting bacteria convert cellulose into fibres.
(d) Cellulose breaks down into smaller components which are egested as roughage.

Q. Which of the following foods is a source of roughage?

Assertion (A): Cellulose-rich food cannot be digested by humans.
Reason (R): Humans have cellulase-producing bacteria in the stomach.

Q. Select the food items which are rich in roughage from the given options.

Roughage is a very good source of energy.

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