Cockroach has a stomadaeal valve between

Crop and gizzard

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Gizzard and mesenteron

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Mesenteron and ileum

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Ileum and colon

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Solution

The correct option is A Gizzard and mesenteron
The gizzard is an outer layer of thick circular muscles and has a thick cuticle forming six highly chitinous plate called teeth. Gizzard helps in grinding the food particles. The entire foregut is lined by the cuticle. Gastric caecae are present in the foregut and midgut., which secrete digestive juice. A stomadaeal valve is present in between the gizzard and the midgut (mesenteron).
So the correct answer is "Gizzard and mesenteron".

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