Question

Uricotelic mode of passing out nitrogenous wastes is found in?

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

Answer 1

The correct option is B

Reptiles and Birds

The correct option is B.

Explanation of correct option:

1. Uricotelic animals are the ones that excrete nitrogenous wastes such as uric acid in the form of a pellet or paste with minimal water loss.
2. Uricotelic organisms include insects, land snails, birds, and most reptiles that must preserve water.

Explanation of incorrect options:

Option A:

1. The excretory organs of annelids are nephridia.
2. Therefore, birds only use the amount of water necessary to push the paste-like uric acid through the excretory tract to eliminate their nitrogen waste.
3. Uric acid makes up the whitish center of bird guano.

Option C:

1. Even though they are considered to be terrestrial creatures, amphibians have weak land adaptations.
2. They can't generate urine that is more concentrated than the blood and instead expel nitrogen as urea.

Option D:

1. In insects, uric acid is the most common excretory byproduct.
2. Amphibians, like humans, have two kidneys that filter waste from the bloodstream and combine it with water to produce urine.

Final answer: Uricotelic mode of passing out nitrogenous wastes is found in reptiles and birds.