Statement: Grass eating animals have a four-stomach system.
Reason: They developed this to digest fats.
Statement is correct but reason is wrong.
Grass eating animals have a four-stomach system. They developed this to digest cellulose present in their diet. Cellulose acts like dietary fibre in humans; it is not digested but adds bulk to our food. Grass eating animals have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria which are not abundant in humans. Animals with such a four stomach system are called as ruminants.