Rate of diffusion across cell membrane depends upon

Size of the substances

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Solubility in lipids

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Both a $&$ b

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Living system

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Solution

The correct option is C
Both a $&$ b

The diffusion rate depends on the size of the substances and smaller substances diffuse faster. Diffusion of any substance across the cell membrane also depends upon its solubility in lipids. It is not dependent on the living system itself.

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