Question

In birds nitrogenous waste is-

• A. Urea
• B. Ammonia
• C. Uric acid
• D. Amino acids

Answer 1

The correct option is C

Uric acid

The correct option is C:

Explanation of the correct option:

1. In the body, nitrogenous wastes tend to generate poisonous ammonia, which must be expelled.
2. Urea is excreted by mammals, while uric acid is excreted by birds, reptiles, and some terrestrial invertebrates.

Explanation of the incorrect option:

Option A:

1. Mammals excrete urea.

Option B:

1. Aquatic animals excrete ammonia.

Option D:

1. Excess amino acids are excreted by some invertebrates, such as mollusks (Unio, Limnaea) and echinoderms (Asterias, Paracentrotus).

Final answer: In birds nitrogenous waste is Uric acid.