Diffusion occurs when molecules move:

From higher to lower concentration

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From higher to lower concentration across a semipermeable membrane

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From lower to higher concentration

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From higher to lower concentration using energy

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Solution

The correct option is A From higher to lower concentration
Diffusion is the process by which molecules move from a region of higher concentration to a region of lower concentration. There is no involvement of energy or semipermeable membrane.

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Similar questions

Assertion : In diffusion, molecules move in a random fashion.

Reason : Diffusion can be both uphill and downhill.

Statement A: In diffusion, molecules move in a random fashion.

Statement R: Diffusion can be both uphill and downhill.

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