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.

Solution:

The correct option is (a).
Cellulose-rich food substances are good sources of roughage in human beings because human beings do not have cellulose-digesting enzymes. Cellulose does not break down into smaller components and is egested as roughage.
 

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