Multiple choice question XII — task. Science CBSE, Class 7.

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Cellulose rich food substances are good sources of roughage in human beings because

cellulose breaks down into smaller components which are egested as roughage.
cellulose gets absorbed in the human blood and converts into fibres.
human beings do not have cellulose-digesting enzymes.
the cellulose digesting bacteria convert cellulose into fibres.

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