A RBC and a plant cell (with thick cell wall) are placed in distil | Filo
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Class 11

Biology

Cell: Structure and Functions

Cell: The Unit of Life

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A RBC and a plant cell (with thick cell wall) are placed in distilled water. The solute concentration is the same in both the cells. What changes would be observed in them?

  1. Both plant cell and RBC would not undergo any change.
  2. The RBC would increase in size and burst while the plant cell would remain about the same size.
  3. The plant cell would increase in size and must burst while the RBC would remain about the same size.
  4. Both plant cell and RBC would decrease in size and collapse.
Correct Answer: Option(b)
Solution: Both the cells will gain water due to osmosis because the surrounding medium is hypotonic as compared to cell sap. The plant cell is however, surrounded by a cellulosic cell wall which is absent in animal cell. Hence, erythrocyte (animal cell) will burst due to expansion of protoplasm and the expanding protoplasm will exert a pressure on plant cell wall from inside (turgor pressure). The plant cell wall will exert an equal pressure in opposite direction on the protoplasm (wall pressure). 
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