Pigeon excretes
(a) Urea
(b) Ammonia
(c) Uric acid
(d) None of the above

Options

A. Urea
B. Ammonia
C. Uric acid
D. None of the above

Answer

To determine the nitrogenous waste excreted by pigeons, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks what type of nitrogenous waste is excreted by pigeons. The options provided are urea, ammonia, uric acid, or none of the above.

2. **Identify the Excretory Product**: Pigeons are birds, and birds typically excrete nitrogenous waste in the form of uric acid. This is a key characteristic of avian species.

3. **Explain Uric Acid Excretion**: Uric acid is less toxic compared to ammonia and urea. It requires less water for excretion, which is advantageous for birds as it helps conserve water, especially in their natural habitats.

4. **Classify the Organism**: Since pigeons excrete uric acid, they are classified as uricotelic organisms. This means they primarily excrete nitrogenous waste in the form of uric acid.

5. **Eliminate Other Options**:
- Urea is primarily excreted by mammals.
- Ammonia is highly toxic and is typically excreted by aquatic animals that have access to large amounts of water.
- Therefore, options A (urea) and B (ammonia) can be eliminated.

6. **Conclude the Answer**: Based on the information, the correct answer is (c) uric acid.

### Final Answer:
(c) Uric acid

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