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Question
Cellulose-rich food substances are a good source of roughage in human beings because
Options
human beings do not have cellulose-digesting enzymes
cellulose gets absorbed in the human blood and converts into fibres
the cellulose-digesting bacteria convert cellulose into fibres
cellulose breaks down into smaller components which are egested as roughage
Solution
human beings do not have cellulose-digesting enzymes
Explanation:
Human beings do not have cellulose-digesting enzymes in their bodies and are therefore unable to digest cellulose. Since it is not digested, it passes down the entire digestive tract from mouth to anus. It acts as roughage, adds bulk to the food and helps the body to easily get rid of undigested food.
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