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Q.

In the alimentary canal of cockroach, six chitinous plates called teeth are present in

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a

preoral cavity

b

crop

c

proventriculus

d

mesenteron

answer is C.

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Detailed Solution

Gizzard, or proventriculus has an outer layer of thick circular muscles and thick inner cuticle forming six highly chitinous plate called teeth. Gizzard helps in grinding the food particles.

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