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  4. 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.

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Q. 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.

AIIMSAIIMS 2011

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.