Give definition of diffusion and write its properties.

Explanation

Definition : The molecules of any substances moving from regions of higher concentration to regions of lower concentration. This process is called diffusion.
Molecules move in random fashion. Properties : Movement by diffusion is passive.
It may be from one part of the cell to the other, or from cell to cell.
This movement is over short distances.
It can be from the inter cellular spaces of leaf to the outside.
No energy expenditure takes place in diffusion.
Diffusion is a slow process and is not dependent on a .living system..
Diffusion can be obvious in gases and liquids.
Diffusion of solid substances is more likely.
Diffusion is very important to plants since it is the only means for gaseous movement within the plant body.
Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.