Question

How does the grass eating animals digest cellulose ?

Answer 1

Grass-eating animals such as cows quickly swallow grass and store it in a separate portion of their stomach called the rumen.

Food gets partially digested in the rumen. This partially digested food is called cud. The cud later returns to the mouth in the form of small lumps. Animals then keep chewing on these lumps.

Grass is rich in cellulose, which cannot be digested by humans and many other animals. Ruminants have a large sac-like structure between the small and large intestine. Cellulose is digested in this region by the action of certain cellulose-digesting bacteria, which are absent in humans.