Osmosis is a process by which solvent molecules (water) diffuse across the selectively permeable membrane from a region of low solute concentration to high solute concentration.
An association of two organisms in which both partners get benefits is called symbiosis. E.g. Nitrogen fining bacteria and roots of leguminous plants.
It is the movement of the plant in response to the stimulus of unilateral light. Stems grow directly towards the light.
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