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Q.

Which of the following structures is responsible for excretion in protozoans?

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a

Ribosomes

b

Mitochondria

c

Contractile vacuole

d

Nucleus

answer is A.

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Detailed Solution

Protozoans excrete waste products through a specialized organelle called the contractile vacuole. This organelle collects excess water and waste from the cell and then contracts to expel the waste material outside the cell. 

The contractile vacuole helps in maintaining the osmotic balance of the cell and prevents it from bursting due to excessive water intake.

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