JAMB Biology 2009 Objective — Question 31
Question 31 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2009 Objective paper, with the correct answer and a full explanation.
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A marine protozoan is likely to have no contractile vacuole mainly because the
- A. cytoplasm is isotonic to seawaterCorrect
- B. cytoplasm is hypertonic to sea water
- C. cytoplasm is hypotonic to sea water
- D. cytoplasm is impervious to seawater
Explanation
The role of a contractile vacuole in a cell is to remove excess water from a cell. If an organism (protozoa) does not have a contractile vacuole, it implies that its cytoplasm has the same concentration as that of the aquatic environment (isotonic).
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