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The site for complete digestion and absorption of food in a cockroach is:

1. Foregut
2. Hindgut
3. Stomodaeum
4. Mesenteron

Answer :

Final answer:

The mesenteron is the site for complete digestion and absorption of food in a cockroach. It is similar to the small intestine in humans. Other parts of the digestive system, like the foregut and hindgut, serve different functions in the digestive process. Thus, the correct answer is option (4) mesenteron.

Explanation:

The site for complete digestion and absorption of food in a cockroach is the mesenteron. In the context of animal digestion, the mesenteron is essentially equivalent to the small intestine in humans, where most of the digestion and absorption of nutrients occurs. Other parts of the cockroach digestive system, such as the foregut and hindgut, have different roles. The foregut is responsible for the ingestion and initial processing of food, while the hindgut deals with the absorption of water and salts and the elimination of indigestible material.

Cockroaches have an extracellular digestive system where food is broken down outside of cells in a specialized digestive tract. After consumption, food moves through the esophagus to the crop for temporary storage. It's then passed into the gizzard for mechanical digestion and eventually arrives in the mesenteron, where extracellular digestion continues and nutrients are absorbed. Indigestible waste products then move into the hindgut, where remaining water and salts are absorbed, and waste is ultimately excreted.

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