5.5 Factors affecting photosynthesis Flashcards
when does a something become a limiting factor?
when it is in short supply and it reduces the rate of photosynthesis
why is light needed in photosynthesis?
source of energy
increasing light intensity increases what?
photosynthesis - the rate of ATP and Reduced NAD production
why is CO2 needed in photosynthesis?
as a source of carbon
increasing the concentration of CO2 increases the rate of what?
carbon fixation in the calvin cycle
rate of TP production
what can affect the rate of enzyme controlled reactions?
temperature
increasing temperature increases the rates of what in photosynthesis?
enzyme controlled reactions
give an example of an enzyme controlled reaction in photosynthesis:
carbon fixation in the calvin cycle
what can happen to enzymes if temperature is too high?
they can denature
the rate of photorespiration increases above what temperature?
25°C
as the rate of photorespiration increases above 25°C, what may be seen?
higher photosynthetic rates at higher temperatures
stomata on plant leaves can close to avoid what?
water loss by transpiration during dry spells and when plants undergo water stress
closure of stomata stops what?
diffusion of CO2 into the plant
if diffusion of CO2 into the plant is stopped what happens to the rate of photosynthesis?
reduced rate of light independent reaction
why is water not a limiting factor of photosynthesis?
for it to be low enough to limit the rate, the plant would have already closed its stomata and stopped photosynthesising
