Question

The swallowed food moves downwards in the alimentary canal because of

A

Force provided by the muscular tongue.

B

The flow of water taken with the food.

C

Gravitational pull.

D

The contraction of muscles in the wall of food pipe.

Medium
Solution
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Correct option is D)

When food goes into the food pipe, the muscles in its walls start alternate contraction and relaxation producing a wave-like movement that called 'peristalsis'. These movements are necessary for forwarding the food downwards in the alimentary canal. 
The correct answer is option (d). 

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