Discussion
Which of the following body part is responsible for conservation of water in insects ?
Answer: B
The paper's answer is Malphigian tubules (Malpighian tubules).
The Malpighian tubules are the excretory organs of insects. They take up water, salts and nitrogenous wastes from the blood and pass them into the hindgut; in the rectum most of the water and useful salts are then reabsorbed, while the nitrogen leaves as nearly dry uric acid. This tubule-and-rectum system lets insects excrete wastes while losing very little water, and in some beetles and caterpillars the tubules are fused to the rectum (the cryptonephridial system) to draw out still more water.
Rectal gills are breathing organs of dragonfly nymphs in water. The crop stores food, and the proventriculus grinds and filters it; neither has a role in conserving water.
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