In Protozoa like Amoeba and Paramecium, an organelle is found for osmoregulation which is

Options

A. Contractile vacuole
B. Mitochondria
C. Nucleus
D. Food vacuole

Answer

**Step-by-Step Solution:**

1. **Understanding Osmoregulation**: Osmoregulation refers to the process by which organisms regulate the balance of water and electrolytes in their bodies. In protozoans, this is crucial for maintaining homeostasis.

2. **Identifying the Organism**: The question mentions two specific protozoans: Amoeba and Paramecium. Both of these organisms live in freshwater environments where the concentration of water is higher outside their bodies than inside.

3. **Function of the Organelles**: In these protozoans, the organelle responsible for osmoregulation is known as the contractile vacuole. This organelle helps to expel excess water that enters the cell through osmosis.

4. **Presence of the Contractile Vacuole**: The contractile vacuole is present in both Amoeba and Paramecium. It works by collecting excess water and then contracting to expel it from the cell, thus helping to maintain the necessary water balance.

5. **Exclusion of Other Organelles**:
- **Mitochondria**: This organelle is responsible for energy production in the form of ATP but does not play a role in osmoregulation.
- **Nucleus**: The nucleus contains genetic material and is not involved in water regulation.
- **Food Vacuole**: This vacuole is involved in the digestion of food, not in osmoregulation.

6. **Conclusion**: Therefore, the correct answer to the question is that the organelle responsible for osmoregulation in protozoans like Amoeba and Paramecium is the **contractile vacuole**.

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