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  4. Smaller, lipid soluble molecules diffuse faster through cell membrane, but the movement of hydrophilic substances is facilitated by certain transporters which are chemically

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Q. Smaller, lipid soluble molecules diffuse faster through cell membrane, but the movement of hydrophilic substances is facilitated by certain transporters which are chemically

Transport in Plants

Solution:

Particles which are lipid soluble (i.e., lipophilic or hydrophobic) can easily diffuse through the cell membrane as the lipid is a major constituent of the membrane. Where as hydrophilic substances {i.e., the substances which are soluble in water, e.g., glucose) do not pass through a biological membrane by simple diffusion. They are, therefore, transported across a cell membrane by facilitated diffusion {i.e., carrier mediated diffusion), which takes place with the help of certain transport proteins.