Question

In protozoa like Amoeba and Paramecium, a organ is found for osmoregulation which is 

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

Answer 1

The Correct Option is A

The question is about identifying the organ responsible for osmoregulation in protozoa such as Amoeba and Paramecium. Osmoregulation is the process by which cells maintain the balance of water and salts in response to varying external conditions. In protozoa, this is crucial as they often live in freshwater environments, where there is a tendency for water to flow into the cell.

The options provided are:

• Contractile vacuole
• Mitochondria
• Nucleus
• Food vacuole

Explanation:

Among the options, the Contractile vacuole is specifically responsible for osmoregulation in these protozoa.

The contractile vacuole is a specialized cellular structure that actively expels water from the cell. It collects excess water and various wastes, and then periodically contracts to pump the water out of the cell to prevent the cell from bursting. This process of expelling water helps in maintaining the necessary osmotic balance.

Mitochondria are primarily involved in energy production (ATP) through the process of cellular respiration.

The Nucleus is the control center of the cell where genetic material is stored and does not play a direct role in osmoregulation.

The Food vacuole is involved in the digestion of nutrients and is not related to osmoregulation.

Conclusion: The correct answer is the Contractile vacuole. It plays a critical role in maintaining osmotic balance by regulating the expulsion of excess water, thereby preventing the cell from taking in too much water and bursting. This function is vital for freshwater protozoa to survive in their habitats.