Urinary bladder is absent in which of the following animals?

Options

A. Duck billed platypus
B. Snake
C. Peacock
D. Kangaroo

Answer

**Step-by-Step Solution:**

1. **Understanding the Function of the Urinary Bladder**: The urinary bladder is an organ that stores urine before it is excreted from the body. It plays a crucial role in waste management in many animals.

2. **Identifying Animals in the Question**: The question asks about which animals do not have a urinary bladder. The options provided include:
- Duck-billed platypus
- Snakes
- Kangaroos
- Peacocks

3. **Analyzing Each Animal**:
- **Duck-billed Platypus**: This is a mammal, and mammals typically have a urinary bladder to store urine. Therefore, it has a urinary bladder.
- **Snakes**: Snakes are reptiles. Most reptiles have a urinary bladder, but some, like certain snakes, may have a reduced or absent urinary bladder. However, generally, they do possess a urinary bladder.
- **Kangaroos**: Kangaroos are also mammals and, like the duck-billed platypus, they have a urinary bladder.
- **Peacocks**: Peacocks are birds (classified as aves). Birds generally do not have a urinary bladder. Instead, they excrete uric acid directly, which helps in reducing body weight for flight.

4. **Conclusion**: Among the options provided, the animal that does not have a urinary bladder is the **peacock**.

5. **Final Answer**: Urinary bladder is absent in **peacocks**.

---