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Question

Which one of the following option gives the correct categorization of six animals according to the type of nitrogenous wastes (1, 2, 3) they give out?

A
  1. Ammonotelic- Frogs, lizards
  2. Ureotelic- Aquatic amphibia, humans
  3. Uricotelic- Cockroach, pigeon
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B
  1. Ammonotelic- Aquatic amphibia
  2. Ureotelic- Frog, humans
  3. Uricotelic- Pigeon, lizards, cockroach
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C
  1. Ammonotelic- Aquatic amphibia
  2. Ureotelic- Cockroach, humans
  3. Uricotelic- Frog, pigeon, lizards
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D
  1. Ammonotelic- Pigeon, humans
  2. Ureotelic- Aquatic amphibia, lizards
  3. Uricotelic- Cockroach, frog
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Solution

The correct option is D
  1. Ammonotelic- Aquatic amphibia
  2. Ureotelic- Frog, humans
  3. Uricotelic- Pigeon, lizards, cockroach

In case of toxicity and solubility ammonia is the most toxic and uric acid is the least toxic. According to toxicity, we can assemble them as Ammonia > urea > uric acid. More toxic substance will require more amount of water for elimination. As aquatic amphibia live in water they are ammonotelic, frog and humans are land animals are ureotelic and birds are uricotelic as they are aves.

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