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Question: Answered & Verified by Expert
When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will:
BiologyTransport in PlantsNEETNEET 2004
Options:
  • A increase in number
  • B disappear
  • C increase in size
  • D decrease in size.
Solution:
1062 Upvotes Verified Answer
The correct answer is: disappear
Contractile vacuole is involved in osmoregulation. When a cell is placed in marine water (hypertonic solution), the water inside the cell (vacuole) rushes out, disappearing the vacuole.

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