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ICSE BIOLOGY - DEFINITIONS

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Definitions 1. Photosynthesis: Photosynthesis is a physiological process by which green plants in the presence of sunlight and chlorophyll prepare food in the form of carbohydrates using carbon dioxide and water. 6CO2 + 12H2O C6H12O6 + 6H2O + 6O2 2. Photophosphorylation:It is the process in which ADP (Adenosine diphosphate) combines with ip (inorganic phosphate) to form ATP (Adenosine triphosphate) in presence of light in the thylakoid containing chlorophyll. ADP + ip ATP 3. Photolysis: It is a process of splitting of water molecules into hydrogen and hydroxyl ions in presence of light and chlorophyll. 4.Diffusion is defined as the movement of molecules or ions of any substance from a region of their high concentration to a region of their low concentration when the two are in direct contact with each other. 5. Osmosis: It is diffusion of water molecules across a semi-permeable from a more dilute solution to a less dilute solution. 6. Plasmolysis is the contraction of cytoplasm from the cell wall caused due to the withdrawl of water when placed in a hypertonic solution. 7. Turgidity: It is a state of a cell in which the cell wall is rigid and stretched by an increase in the volume of vacuoles due to the absorption of water.

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Additional Info : ICSE Biology Notes by Bhomik Acharya (bhomik1018)
Tags : icse bio definitions, ICSE Notes and Tips.  

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