Question

$N{H}_3$ in Amoeba is excreted by

• A. Food vacuole
• B. Contractile vacuole
• C. Plasma membrane
• D. Both B and C

Answer 1

The correct option is B Contractile vacuole

Amoeba is a unicellular organism found in fresh water. In Amoeba carbon dioxide and ammonia are the main waste materials. These waste materials are excreted out by the process of diffusion through general body surface. In amoeba, contractile vacuoles also play some role in the removal of waste materials. The waste materials present in the cytoplasm of amoeba enters the contractile vacuole. Then, the contractile vacuole moves close to the plasma membrane, come in contact with plasma membrane and burst to release its contents in the surrounding. Thus the correct answer is option B.