Choose the odd one out from each group and give reasons. (i) liver, salivary gland, starch, gall bladder (ii) stomach, liver, pancreas, salivary gland (iii) tongue, absorption, taste, swallow (iv) oesophagus, small intestine, large intestine, rectum

Soln:

1. The answer is Starch because starch is a carbohydrate, whereas the liver, salivary gland and gall bladder are the glands.
2. The answer is the stomach because others are digestive glands
3. Absorption is the answer because tongue, swallow and taste are related to the buccal cavity but not absorption.
4. The small intestine is the answer because the oesophagus, large intestine and rectum will not take part in digestion, whereas the small intestine plays the main role in the digestion process.