Osmoregulation in Amoeba takes place by :

Question

Accepted Answer

Osmoregulation in Amoeba takes place by the contractile vacuole, which is why Option 1 is the correct answer. Here is a detailed explanation:

1. **Contractile Vacuole (Option 1):** The contractile vacuole is a specialized organelle in amoebas and other unicellular organisms that plays a crucial role in osmoregulation. It functions by collecting excess water that diffuses into the cell from the surrounding environment. Once the contractile vacuole fills with water, it contracts and expels the water out of the cell, thereby maintaining the cell's osmotic balance and preventing it from bursting due to excess water intake. This process is vital for the survival of amoebas, especially in hypotonic environments where water tends to flow into the cell.

2. **Food Vacuole (Option 2):** The food vacuole is involved in the digestion of ingested food particles. It does not play a role in osmoregulation. Instead, it serves as a site where enzymes break down food particles for nutrient absorption. Therefore, it is not responsible for regulating water balance in the cell.

3. **Plasma Gel (Option 3):** Plasma gel refers to the gel-like state of the cytoplasm in amoebas, which is involved in the movement and structural support of the cell. It does not have a role in osmoregulation. The plasma gel is part of the cytoskeleton and helps in the amoeba's locomotion through pseudopodia formation, but it does not manage water balance.

4. **Plasmalemma (Option 4):** The plasmalemma, or cell membrane, is the outer boundary of the cell that controls the movement of substances in and out of the cell. While it is involved in maintaining the overall homeostasis of the cell, it does not specifically regulate osmotic balance through active expulsion of water. The contractile vacuole is the organelle specifically adapted for this purpose.

In conclusion, the contractile vacuole is the organelle responsible for osmoregulation in amoebas, making Option 1 the correct answer. The other options do not perform this specific function.