Malphigian tubules convert nitrogenous waste into:
Correct answer: C. uric acid
- A. urine
- B. ammonia
- C. uric acid
- D. urea
Explanation
Malphigian tubules are specialized excretory organs found in insects like cockroaches. They convert nitrogenous waste into uric acid, a compound that can be excreted with minimal water loss. This is particularly advantageous for water conservation in terrestrial environments. Option C is correct because uric acid is the end product of nitrogenous waste processing in these tubules. Option A (urine) and Option D (urea) involve more water for excretion, which is not as efficient in conserving water. Option B (ammonia) is highly toxic and requires a lot of water to be excreted safely, making it unsuitable for organisms relying on Malphigian tubules.
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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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