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NEET 2022 · BiologyPrevious Year Question

Nitrogenous waste is excreted in the form of pellet or paste by:

Answer: (D) Pavo. Answer: (D) Pavo.

  1. A.Ornithorhynchus
  2. B.Salamandra
  3. C.Hippocampus
  4. D.Pavo✓

Correct Answer

(D) Pavo

Solution & Explanation

Answer: (D) Pavo. Solution: Excreting nitrogenous waste as a pellet or paste of uric acid (with minimum water loss) is called uricotelism, and NCERT states that reptiles, birds, land snails and insects are uricotelic. Pavo (the peacock) is a bird and is therefore uricotelic, excreting uric acid as pellet/paste. The others are not uricotelic: Ornithorhynchus (platypus, a mammal) and Salamandra (an amphibian) are ureotelic, while Hippocampus (sea horse, a bony fish) is ammonotelic. NCERT Reference: Ch 16, p.205, line(s) 33-40 — "Reptiles, birds, land snails and insects excrete nitrogenous wastes as uric acid in the form of pellet or paste with a minimum loss of water and are called uricotelic... animals."

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