In Amoeba cytoplasmic water/osmolarity is controlled by

Options

A. Food vacuole
B. Contractile vacuole
C. Body surface
D. Pseudopodia.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how amoeba controls its cytoplasmic water and osmolarity. Osmolarity refers to the concentration of solutes in the cytoplasm, which affects water movement and balance.

2. **Analyzing the Options**:
- **Food Vacuole**: This structure is primarily involved in digestion and excretion of food particles. It does not play a role in osmoregulation.
- **Contractile Vacuole**: This is a specialized organelle in amoeba that functions to expel excess water from the cell, thus helping to maintain osmotic balance and regulate cytoplasmic water levels.
- **Body Surface**: The body surface of amoeba provides protection and helps maintain its shape, but it does not directly control osmolarity.
- **Pseudopodia**: These are extensions of the cell membrane used for movement and engulfing food, not for regulating osmolarity.

3. **Identifying the Correct Answer**: Among the options, the contractile vacuole is the only structure that directly contributes to controlling osmolarity by expelling excess water, thus maintaining the balance of solutes in the cytoplasm.

4. **Conclusion**: The correct answer to the question is the **contractile vacuole**.

**Final Answer**: The cytoplasmic water/osmolarity in amoeba is controlled by the **contractile vacuole**.

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