Transcription: During osmosis, molecules diffuse through a membrane from the side with the higher concentration to the side with the lower concentration. When the concentration of water outside the root surface is greater than the concentration inside, water diffuses into the root. But if the concentration of water is greater inside the root than outside, the direction of diffusion will reverse. The structure of the membrane prevents other substances from diffusing. food molecules cannot diffuse from the root into the soil.
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