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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Photosynthesis Equations
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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