Explain the diffusion pressure gradient.

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Solution

DPD of a certain cell is the measure of the capacity of the cell to draw water from the surrounding. When the DPD of a cell [A] is higher than the DPD of an adjacent cell [B], Cell (A) will draw water from the cell (B) till the DPD of the two cells becomes equal i.e. the state of equilibrium has reached This difference in the value of DPD between two cells results into a deficiency gradient, which is called as diffusion pressure gradient.

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Compared to $O_{2}$ , diffusion rate of $C O_{2}$ through the diffusion membrane per unit difference in partial pressure is much higher. Explain.

Which of the following statements are true/false?

a. The positive hydrostatic pressure is called turgor pressure.

b. Wall pressure is exerted to prevent the increase of protoplasm size.

c. Diffusion is more rapid in liquids than in gases.

d. Diffusion of water through a semi-permeable membrane is called imbibition.

e. Osmosis is the movement of substances which occurs along a diffusion gradient.

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