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
(c) the cellulose-digesting bacteria convert cellulose into
(d) cellulose breaks down into smaller components which
are egested as roughage.
NCERT Class VIII
Science - Exemplar Problems
Chapter 2. Nutrition in Animals