(i) Starch : liver, salivary gland and gall bladder are all parts of the alimentary canal. They either produce an enzyme or store it. It facilitates digestion. Whereas starch is a type of food.
(ii) Stomach: liver, pancreas and salivary glands are the glands which produce enzymes.
(iii) Absorption : Tasting and swallowing are the functions performed by a tongue but it never helps in absorption.
(iv) Small intestine: Oesophagus, large intestine and rectum are not involved in any type of food digestion. Oesophagus provides a passage for food ttransfer, large intestine is mainly involved in water reabsorption from undigested food, while rectum temporarily stores faeces. Only small intestine is involved in digestion of food