In Amoeba and Paramecium osmoregulation occurs through

Options

A. Pseudopodia
B. Nucleus
C. Contractile vacuole
D. General surface.

Answer

**Step-by-Step Solution:**

1. **Understanding Osmoregulation**:
- Osmoregulation refers to the process by which organisms maintain the balance of water and salts in their bodies. This is crucial for cellular function and overall homeostasis.

2. **Identifying the Mechanism in Amoeba and Paramecium**:
- In both Amoeba and Paramecium, osmoregulation is primarily achieved through a specific structure known as the contractile vacuole.

3. **Evaluating the Options**:
- **Option 1: Pseudopodia**: These are extensions of the cell membrane that help in locomotion and feeding but do not play a role in osmoregulation.
- **Option 2: Nucleus**: The nucleus is responsible for genetic material and cellular control but does not directly participate in osmoregulation.
- **Option 3: Contractile Vacuole**: This is the correct answer, as it actively expels excess water from the cell, helping to maintain osmotic balance.
- **Option 4: General Surface**: The surface area of the organism does not function in osmoregulation.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is that osmoregulation in Amoeba and Paramecium occurs through the **contractile vacuole**.

**Final Answer**: Contractile vacuole

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