Malpighian tubules remove nitrogenous wastes from the
Correct answer: B. Haemolymph of insects
- A. Blood of earthworms
- B. Haemolymph of insects
- C. Tissue fluid of flatworms
- D. Interstitial fluid of hydra
Explanation
Malpighian tubules are a type of excretory and osmoregulatory system found in insects and some arachnids. They remove nitrogenous wastes from the haemolymph, the equivalent of blood in these organisms, by converting them into uric acid to be excreted. Options A, C, and D are incorrect because earthworms, flatworms, and hydra use different mechanisms for excretion. Earthworms use nephridia, flatworms use protonephridia, and hydra eliminate waste through diffusion due to their simple body structure.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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