The urinary bladder is absent in

Options

A. Chameleon
B. Snake
C. Snake and crocodile
D. Wall lizard

Answer

To determine which organism does not possess a urinary bladder, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organisms**: The organisms given in the question are chameleon, snake, crocodile, and wall lizard. All of these belong to the class Reptilia (reptiles).

2. **Understand Urinary Bladder Function**: The urinary bladder is an organ that stores urine before it is excreted. In many animals, it plays a crucial role in the excretion process.

3. **Examine the Excretion Methods in Reptiles**: Some reptiles and birds do not have a urinary bladder. Instead, they excrete waste in a different manner to conserve water. They often mix liquid waste with solid waste to form a semi-solid paste.

4. **Identify Specific Cases**:
- **Chameleon**: Has a urinary bladder that stores urine.
- **Snake**: Does not have a urinary bladder; instead, it uses the cloaca for excretion.
- **Crocodile**: Also does not have a urinary bladder; it uses the cloaca for excretion.
- **Wall Lizard**: Has a urinary bladder.

5. **Conclusion**: Based on the information, both the snake and crocodile do not possess a urinary bladder. Therefore, the correct answer to the question is that the urinary bladder is absent in snakes and crocodiles.

### Final Answer:
The urinary bladder is absent in **snake and crocodile**.

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