Question

Uricotelic mode of passing out nitrogenous wastes is found in:

  • A Insects and Amphibians
  • B Reptiles and Birds
  • C Birds and Annelids
  • D Amphibians and Reptiles

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Answer

The uricotelic mode of passing out nitrogenous waste is primarily found in reptiles and birds.

  • Reptiles like lizards and crocodiles, as well as birds such as parrots and crows, excrete nitrogenous wastes in the form of uric acid.
  • Uric acid is excreted as a paste or pellets, which significantly minimizes water loss. This adaptation is crucial for these animals as it helps to conserve water.
  • Consequently, reptiles and birds are categorized as uricotelic animals.

On the other hand:

  • Amphibians typically excrete nitrogenous waste in the form of ammonia, which is highly soluble in water and diffuses through membranes.
  • Annelids, like earthworms, have a slightly more advanced excretory structure called nephridia.

Thus, the correct answer is:

B. Reptiles and Birds


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