Section 3: Photosynthesis
- Created by: Bethany
- Created on: 07-04-19 11:28
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- 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
- Carbon Dioxide + Water -> Glucose + Oxygen
- 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
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