Section 3: Photosynthesis

  • Created by: Bethany
  • Created on: 07-04-19 11:28
View mindmap
  • Section 3: Photosynthesis
    • Carbon Dioxide + Water -> Glucose + Oxygen
      • 6CO2 + 6H2O -> C6H12O6 + 6O2
    • What Is It?
      • Photosynthesis converts light energy into chemical energy stored in glucose
      • Chlorophyll absorbs sunlight and converts CO2 and H2O into glucose and O2
    • Leaf Adaptations
      • Broad leaves = large SA exposed to light
      • Most chloroplasts found in palisade layer
        • Near top of the leaf to get the most light
      • Upper epidermis = transparent so light passes through to palisade layer
      • Waxy cuticle helps reduce water loss via evaporation
      • Gas exchange adaptations, e.g. stomata, also make photosynthesis more efficient
    • Limiting Factors
      • Limiting factors stop something from happening any faster
      • NOT ENOUGH LIGHT
        • Chlorophyll uses light energy - if intensity is increased it will increase steadily until a point
        • Then, light intensity won't make a difference: it will either be temperature or CO2 level that is the limiting factor
      • TOO LITTLE CO2
        • CO2 is a raw material and makes up 0.04% of the air
        • Concentration of CO2 will increase photosynthesis up to a point
        • After this point temp. or light intensity limits photosynthesis
  • TEMPERATURE
    • As temp increases, photosynthesis increases to a point
    • Temp affects enzymes involved with photosynthesis
    • If temp is above 45'C the enzymes become denatured and photosynthesis decreases rapidly
    • Usually temp is the limiting factor because it's too low
    • Limiting Factors
      • Limiting factors stop something from happening any faster
      • NOT ENOUGH LIGHT
        • Chlorophyll uses light energy - if intensity is increased it will increase steadily until a point
        • Then, light intensity won't make a difference: it will either be temperature or CO2 level that is the limiting factor
      • TOO LITTLE CO2
        • CO2 is a raw material and makes up 0.04% of the air
        • Concentration of CO2 will increase photosynthesis up to a point
        • After this point temp. or light intensity limits photosynthesis

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Photosynthesis resources »