cellulose rich food substances are good source of roughage in human beings because 1. human beings do not have cellulose digesting enzymes 2. cellulose gets absorbed in the human blood and coverts into fibres 3. the cellulose digesting bacteria convert cellulose into fibre 4. cellulose breaks down into smaller components which are egested as roughage
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Explanation:
Option 1. human beings do not have cellulose-digesting enzymes
Humans do not have the enzyme called cellulase which degrades the beta-1, 4 glycosidic bonds of cellulose.
Hence, humans cannot digest cellulose.
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