Diffusion in Plants Flashcards

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What is diffusion?

Diffusion is the net movement of particles from a high concentration to a low concentration.

They move down a concentration gradient, from where they are more crowded to where they are less crowded.

Carbon dioxide diffuses from the air into the leaf for photosynthesis.

Oxygen diffuses out because it is made as a waste product of photosynthesis.

Gases diffuse in and out of leaves through tiny openings called stomata.

Air spaces give a large surface area and short distance for gases to diffuse to and from cells.

Leaves are thin, have a large surface area, many stomata and air spaces to speed up diffusion.

It is the difference in concentration of a substance, for example between the air outside and the air spaces inside the leaf.

At higher temperatures particles move faster, so diffusion happens more quickly.

Water vapour diffuses from moist air spaces inside the leaf to the drier air outside through the stomata.