photosynthesis

• Photosynthesis


  The chemical reaction carried out by plants, where they absorb light and produce glucose as energy, releasing oxygen
• Photosynthesis


  • Requires water (H2O)
  • Requires carbon dioxide (CO2)
  • Produces glucose
  • Produces oxygen (O2)
• Photosynthesis


  Carbon dioxide + water + light energy → glucose + oxygen
• Chlorophyll


  Green pigment stored in chloroplasts that absorbs light
• Products of photosynthesis


  • Respiration
  • Stored as starch
  • Stored as fat, oils
  • Used to make cellulose
  • Used to make protein
• Adaptations for photosynthesis


  • Root hair cells absorb water and minerals
  • Stomata allow CO2 in and O2 out
  • Chlorophyll absorbs light
• Light intensity


  The amount of light reaching the plant
• Increasing distance from light source

  Decreases light intensity
• Decreasing distance from light source

  Increases light intensity
• Limiting factor


  Something controlling the rate of photosynthesis
• Limiting factors for photosynthesis

  • Light
  • Carbon dioxide
  • Chlorophyll
  • Temperature
• Water is not a limiting factor for photosynthesis
• Limiting factor graphs


  • Concentration of CO2: As CO2 increases, photosynthesis increases until CO2 is no longer the limiting factor
  • Concentration of light: As light increases, photosynthesis increases until light is no longer the limiting factor
  • Amount of chlorophyll: As chlorophyll increases, photosynthesis increases until chlorophyll is no longer the limiting factor
  • Temperature: As temperature increases, photosynthesis increases to an optimum, then decreases as temperature becomes too high