- Created by: nina Ilhan
- Created on: 28-12-18 15:47
- Photosynthesis uses energy to change carbon dioxide and water into glucose and oxygen.
- It takes place in chloroplasts in green plant cells - they contain pigments like chloropyll that absorb light.
- Energy is transferred to the chloroplasts from the environment by light.
- Photosynthesis is endothermic - this means energy is transferred from the environment in the process.
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- The word equation for photosynthesis is:
Carbon dioxide + water ---> glucose + oxygen
- The symbol equation for photosynthesis is:
6CO2 + 6H2O ---> C6H12O6 + 6O2
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Plants use of Glucose
- For respiration - This transfer of energy from glucose which enables the plants to convert the rest of the glucose into various other useful substances.
- Making cellulose - Glucose is converted into cellulose for making strong plant cell walls.
- Making amino acids - Glucose is combined with nitrate ions (absorbed by the soil) to make amino acids, which are then made into proteins.
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Plants use of Glucose continued
- Stored as oil or fats - Glucose is turned into lipids for storing in seeds.
- Stored as starch - Glucose is turned into starch and stored in the roots, stems and leaves, ready for use when photosynthesis isn't happening, like in the winter.
- Starch is insoluble, which makes it much better for storing than glucose - a cell with lots o glucose in would draw in loads of water and swell up.
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