Q6 / 180 · AIIMS 2011 · Botany

Assertion : Water that enters into a plant cell through diffusion makes it turgid. Reason : Entry of water into the cell through diffusion develops wall pressure inside the cell.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • Correct answer
    C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

Cell's turgidity is due to turgor pressure. Turgor pressure is the pressure which develops in the confined part of an osmotic system due to osmotic entry of water into it. It is also called hydrostatic pressure or pressure potential. The force exerted by the cell wall over the protoplast is called wall pressure. Normally wall pressure is equal and opposite to turgor pressure except when the cell becomes flaccid.

Hence, the correct answer is option: 'C'.

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