Name the process which is useful for the movement of substances like CO $_{2}$ and O $_{2}$ across the cell membrane.

Diffusion

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Osmosis

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Active diffusion

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Reverse osmosis

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Solution

The correct option is B Diffusion
Diffusion is a process in which the gaseous molecules spread, due to their kinetic energy, and the movement of molecules is from higher concentration to lower concentration. CO $_{2}$ and O $_{2}$ are gases. They move in and out of the cell by diffusion.
So, the correct answer is 'Diffusion'

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(e) Diffusion of $O_{2} a n d C O_{2}$ between blood and tissues.~

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Name the process by which the substances of the cell move across the cell membrane.

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