Discussion
Which of the following class of protozoa does not generally contain contractile vacuole?
Answer: A
Correct answer: Sporozoa
Sporozoans are parasites living in the body fluids of their hosts, which are isotonic with them, so no water floods in and no organelle is needed to pump it out. The contractile vacuole is essentially a fresh water adaptation, and its absence follows directly from where these animals live.
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