Differentiate between members of each of the following pairs with reference to the phrases in brackets.
Diffusion:
Diffusion is defined as the main means of transport of substances or molecules from a region of higher concentration to a region of lower concentration.
Osmosis:
Osmosis is the passage of solvent molecules across a semipermeable membrane from a region of high water potential towards a region of low water potential.
Diffusion | Osmosis |
1. Diffusion involves the movement of both solute and solvent molecules along the concentration gradient. | 1. Osmosis involves the movement of only solvent molecules along the concentration gradient of solvent. |
2. It does not involve a semipermeable membrane. | 2. It involves a semipermeable membrane. |
3. The flow of molecules can occur in all directions. | 3. The flow of solvent molecules can only occur in a specific direction. |
4. Significance of diffusion: transpiration of water in form of water vapor, gaseous exchange by respiration, etc. | 4. Significance of osmosis: absorption of water molecules by roots, opening and closing of stomata, etc. |