(i) Why are Villi present in the intestine and not in the stomach?
(ii) What are the basic layers of the wall of alimentary canal?
(i) Villi are present in the intestine to increase the surface area so, that absorption of
digested food occurs efficiently.
(ii) The wall of alimentary canal from oesophagus to rectum possesses four layers, i.e., serosa, muscularis, sub-mucosa and mucosa. Serosa is the outermost layer, followed by muscularis, sub-mucosa and mucosa.