Choose the correct sequence of alimentary canal of Cockroach

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Gizzard → Crop → Malpighian tubules → Hepatic caeca → Rectum

Gizzard → Hepatic caeca → Crop → Rectum → Malpighian tubules

Crop → Gizzard → Hepatic caeca → Malpighian tubules → Rectum

Crop → Hepatic caeca → Gizzard → Rectum → Malpighian tubules.

answer is C.

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Detailed Solution

In cockroach, oesophagus opens into a sac-like structure called crop (used for storing of food). Crop followed by gizzard that helps in grinding the food particles. A ring of 6-8 blind tubules (called hepatic of gastric caecae) is present at the junction of foregut and midgut, which secrete digestive juice. Malpighian tubules, present at the junction of midgut and hindgut helps in the removal of excretory products. Hindgut is differentiated into ileum, colon and rectum. The rectum opens out through anus.

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