Cellulose-rich food substances are good source of roughage in human beings .Why? Class VII Science - Exemplar Problems Chapter 2. Nutrition in Animals
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This is bcoz
Human beings don't have an cellulose digesting enzymes.
Cellulose gets observed in the human blood and converts into fibres
The cellulose digesting bacteria converts cellulose into fibre
Cellulose breaks down into smaller components which are egested as roughage.
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