NEET 2004 Biology question

When a fresh water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will -

(1)DisappearCorrect
(2)Increase in size
(3)Decrease in size
(4)Increase in number

Answer: (1)

Solution

The contractile vacuole of a freshwater protozoan (such as Amoeba or Paramecium) expels the excess water that enters by osmosis, because the cell is hypertonic to its surroundings. Marine water has a solute concentration equal to or higher than that of the cell, so there is no

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Question ID VK-089516