Key area 3 - Photosynthesis

• The 2 stages of photosynthesis

  The light reactions

  Carbon fixation
• What does chlorophyll in green plants do

  It’s a pigment that traps light energy
• What is the overall energy conversion in photosynthesis

  Light energy -> chemical energy
• What the light energy splits and the fate of each product

  Light splits water into hydrogen and oxygen

  • hydrogen Is passed to carbon fixation
  • oxygen diffuses out of the plant as waste product
• What controls carbon fixation

  Specific enzymes
• What are the 2 products from the light reactions that are needed for carbon fixation

  ATP and Hydrogen
• What is the waste gas produced during the reactions

  Oxygen
• What are the 3 fates of the glucose produced

  • Stores as starch
  • made into cellulose as part of the cell wall
  • used in respiration as a energy source
• state the 3 limiting factors of photosynthesis

  • Temperature
  • Carbon dioxide concentration
  • Light intensity
• What happens if a limiting factor is in short supply

  the plant can’t grow
• General word equation for photosynthesis

  light

  carbon dioxide+water ->sugar+oxygen

  Chlorophyll