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NEET Biology NEET PYQ-Biological Classification and System of Classification

  • question_answer
    When a fresh water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will: [AIPMT (S) 2004]

    A) increase in number

    B) disappear

    C) increase in size

    D) decrease in size

    Correct Answer: B

    Solution :

    [b] Fresh water protozoans live in hypotonic solution so, for regulation of excess of water which comes in the protoplasm through the process of endosmosis, contractile vacuoles have developed, When these protozoans are placed in marine water i.e., hypertonic water, the contractile vacuoles become disappear because the process of endosmosis does not happen and thus, water does not come in the protoplasm.


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