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Question

Marine protozoans lack contractile vacuole because ________________.
They are hypotonic to their environment
They are isotonic with their environment
Their body cannot accommodate it
Osmoregulation is done by cell membrane

A

Osmoregulation is done by cell membrane

B

They are hypotonic to their environment

C

They are isotonic with their environment

D

Their body cannot accommodate it

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Solution

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Marine protozoa live in a hypertonic environment, unlike freshwater protozoa.
The contractile vacuole is used to store and remove excess water which is due to endosmosis.
Marine protozoa do not have contractile vacuole because they need to conserve water content from getting lost in the hyperosmotic environment.

So, the correct answer is 'They are hypoosmotic to their environment'

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