Biology
Answer
| Diffusion | Active transport |
|---|---|
| Diffusion is the free movement of molecules of a substance (solute or solvent, gas, liquid) from the region of their higher concentration to the region of their lower concentration when the two are in a direct contact. | It is the movement of a salt or an ion from a region of its lower concentration to a region of its higher concentration through a living membrane. |
Related Questions
List three main characteristics of the roots that enable them to draw water from the soil.
Write true or false.
(i) Diffusion is the movement of molecules from a region of their lower concentration to that of a higher one.
(ii) Osmosis includes diffusion, but not vice versa.
(iii) Osmosis is unidirectional.
(iv) Exosmosis may cause bursting of a cell.
(v) Semi-permeable membrane prevents the passage of the solute molecules.
(vi) In an experiment on osmosis, if external pressure is applied on a dilute solution, less water will pass into the concentrated solution.
A cell kept in a certain solution bursts after some time. Comment upon the kind of solution.
Which process — diffusion, osmosis or active transport, needs involvement of energy?