5. Limiting factors of photosynthesis

Question 1

name the three optimum conditions for photosynthesis

Answer 1

1. High light intensity of blue, red wavelengths
2. Temperature,
   
   • at low temperatures (10C) enzymes are inactive
   • at high temperatures 45C enzymes begin to denature
   • at high temperatures the stomata also close to prevent water loss, reducing speed of photosynthesis as there is less CO2 entering the cell
3. Carbon Dioxide at 0.4% is the most effective for photosynthesis, any higher then the stomata

Question 2

name the three photosynthetic pigments

Answer 2

• chlorophyll a
• chlorophyll b
• carotene

Question 3

what wavelength do these photosynthetic pigments reflect?

Answer 3

green light

Question 4

how do farmers use optimum conditions?

Answer 4

to produce the most high quality yield using green houses
- right CO2 levels
- correct wave length of light to reduce cost
- right temperature for effective enzyme function