Why are gradients important in diffusion and osmosis?

1 Answer

Gradients are important in diffusion and osmosis as they determine important features for them.

Explanation:

If osmosis and diffusion move along the concentration gradient it is known as passive diffusion. Passive diffusion/osmosis is when molecules/water move through a selectively permeable membrane from an area of high to low concentration. Passive diffusion requires no energy.

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However if diffusion occurs against the concentration gradient it is known as active diffusion. Active diffusion is when molecules move through a selectively permeable membrane from an area of low to high concentration. Active diffusion requires carrier proteins and cellular energy.

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Here is a video which describes how osmosis impacts onion cells placed into tap water and then into a salt water solution.

Hope this helps!