The main function of the contractile vacuole is

Synthesis of carbohydrate

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Eliminating excess water

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To be a photoreceptor to detect light

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Resistance for survival during winter and times of drought

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Solution

The correct option is B Eliminating excess water
The contractile vacuole is a structure found in many marine organisms. It functions as an organelle to eliminate the excess water which may have been stored in the cell because of osmotic conditions.
so, the correct option is 'eliminating excess water'

Suggest Corrections

Salt conc.	Rate of contractile vacuole contractions per minute
Very high	2
High	8
Medium	15
Low	22
Very Low	30