It is the movement of molecules from the area of higher
concentration to the area of lower concentration. A few substances freely
diffuse across the cell membrane. For example oxygen, carbon dioxide, diffuse
in and out of the cells.
Diffusion is an essential step in biological
processes like photosynthesis, respiration etc. During stomatal transpiration,
water vapours from the intercellular spaces escape out in the outer atmosphere
by this process.
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