Question

Question 12
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.

Answer 1

The answer is option (a).

Cellulose is a good source of roughage as it does not get digested due to the absence of cellulose-digesting enzymes in the human alimentary canal. It, thus, adds to the volume of undigested food in the form of roughage making the removal of faecal matter easier.