Question

Why is small intestine in herbivores longer than in carnivores?

Answer 1

carnivores are the animals which eat all type of non veg and all.they have a small intestine which plays a very important role and have it smaller comparatively  to herbivores which only eat grass and are vegetarians.a 
as meat is completely easy to digest,the small intestine is smaller in carnivores and as grass  and other foods are very hard to digest in herbivores.so,herbivores have a longer small intestine as compared to carnivores

Answer 2

Herbivores eating grass need a longer small intestine to allow the cellulose to be digested. Whereas Meat is easier to digest, hence carnivores like tiger have shorter small intestine.