| TERMS | DEFINITIONS |
| Homeostasis | The maintenance of a constant internal environment despite fluctuations in the external environment is called homoeo stasis. |
| Diffusion | The movement of molecules from the area of higher concentrationto the area of lower concentration is called simple diffusion. |
| Facilitated diffusion | The movement of molecules through the
protein molecules from higher to lower |
| Osmosis | The diffusion of water across a selectively permeable membrane from an area of higher
concentration to an area of lower |
| Tonicity | The relative concentration of solutes in the
water inside and outside the cell is called |
| Active transport | The movement of molecules form the area of
lower concentration to the area higher concentration by the expenditure of energy is called active-transport. |
| Endocytosis | The bulk movement of material into the cell by formation of vesicle is called endocytosis. |
| Cytoplasm | The living content of the protoplasm between
plasma membraneand nucleus is called |
| True solution | The small moleculesand ions form true
solution. The molecules present in the form of true solution are glucose, some amino acids. soluble salts, ions etc. |
| Colloidal solution | Some large molecules form colloidal solution. Colloidal solution is present in two forms. |
| Sol | Non-viscous colloidal solution is called sol. It is present in liquid form. |
| Gel | The viscous colloidal solution is called gel. It
is presentin the formof semi-solid. ‘lite |
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