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In alimentary canal of cockroach, which is the structure that has well-developed circular muscles and six chitinous plates?

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Midgut

Pharynx

Rectum

Proventriculus

answer is D.

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Detailed Solution

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

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