Limiting Factors Flashcards
1
Q
give the 3 limiting factors of photosynthesis?
A
- light intensity
- Carbon dioxide concentration
- temperature
2
Q
how does light intensity affect the rate of photosynthesis?
A
- the higher the light intensity, the more energy there is for the light dependent reaction
- faster the rate of photosynthesis
- light needs to be the right wavelengths
- so they look green because they reflect green light
- they absorb red and blue
- different pigments absorbs different wavelengths
3
Q
how does carbon dioxide affect the rate of photosynthesis?
A
- carbon dioxide needed for the light independent reaction
- carbon dioxide is continuously the limiting factor (day twice)
- carbon dioxide is about 0.04% of the atmosphere
- optimum carbon dioxide concentration is 0.4%
- above 0.4% - carbon dioxide has a negative effect on the rate of photosynthesis
4
Q
how does temperature affect the rate of photosynthesis?
A
- photosynthesis is controlled by enzymes
- if you increase temperature, you increase the rate of reaction up to the optimum temperature
- beyond the optimum temperature, the temperature decreases
- high temp can cause the stomata to close -> carbon dioxide decreases
therefore decreases the calvin cycle
5
Q
how could someone increase light intensity?
A
- use lighting at night (correct wavelength)
- absorbs light to pass in
6
Q
how could someone increase carbon dioxide?
A
- burns fossil fuel in a greenhouse
- increase carbon dioxide concentration
e.g. propane
7
Q
how could someone increase temperature?
A
- burner increases temperature
greenhouse traps warm air - heating/ cooling to maintain optimum temperature (thermostat)