Which part of the alimentary canal of cockroach has an outer layer of thick circular muscles and inner cuticle forming six highly chitinous plates called teeth?

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The alimentary canal in cockroaches is divided into three parts: foregut, midgut, and hindgut. Foregut consists of mouth, esophagus, crop, and gizzard. The crop is the largest part of the foregut. Its main function is to store food. The gizzard is also known as proventriculus. Food from crop enters the gizzard. The gizzard is made up of muscles and also consists of teeth in the inner layer and thus it helps in grinding. Food from the gizzard then enters the midgut where remaining grinding and absorption takes place.

Zoology - Structural Organisation in Animals Question with Solution | TestHub

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