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Biology revision

  • Photosynthesis is in two stages.
  • Energy from the sun is used in photosynthesis to change carbon dioxide and water into glucose and oxygen.
  • To do this it takes chloroplasts in plant cells. Chloroplasts contain pigments that absorb the light energy, for example this is what chlorophyll does.
  • C = carbon dioxide      H2O = water      H = glucose     O = oxygen
  • Even though this is a single chemical reaction, photosynthesis happens in two stages.
  • Water is split into oxygen by the light energy.
  • However water isn't the overall product due to more being used up in the first stage than how much is produced in the second.

Glucose is converted into other substances:

  • Resipration…


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