Biological Classification And System Of Classification Question 379
Marine protozoans lack contractile vacuole because they live in a hypertonic environment
[DPMT 2001]
Options:
A) Their body cannot accommodate it
B) They are hypotonic to their environment
C) They are isotonic with their environment
D) Osmoregulation is done by cell membrane
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Answer:
Correct Answer: B
Solution:
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 exosmosis.
Marine protozoa do not have contractile vacuole because they live in a hypotonic environment where water enters the cell, so they do not need to conserve water.
BETA
