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  3. Biology
  4. Assertion: Osmosis is a special type of diffusion of water through a semi-permeable membrane. Reason: The net direction and rate of osmosis depends only on the pressure gradient.

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Q. Assertion : Osmosis is a special type of diffusion of water through a semi-permeable membrane.
Reason : The net direction and rate of osmosis depends only on the pressure gradient.

Transport in Plants

Solution:

Diffusion of water from its pure state (or dilute solution) into a solution (or stronger solution) when the two are separated by a semi-permeable membrane is termed as osmosis. The direction and rate of osmosis depend upon the sum of two forces, pressure gradient (gradient of $\Psi_{p}$) and concentration gradient (gradient of $\Psi_{s}$). The net force or gradient is determined by the difference in the water potentials of solutions separated by a semipermeable membrane.