Question

The kidneys resemble the contractile vacuoles of protozoans in

• A. Expelling out excess of water
• B. Expelling out glucose
• C. Expelling out urea and uric acid
• D. Expelling out salts

Answer 1

The correct option is A Expelling out excess of water

Some protozoan animals possess an organelle having the form of an internal sac or vacuole, which enlarges by the accumulation of a clear fluid and then discharges its contents to the exterior. The chief role of the contractile vacuole is osmotic regulation, not nitrogen excretion.