A2 biol4 Past paper question help.Watch
click the graph to enlarge
Numbers at the bottom are the temperatures.
Stuck on this question. Please tell me how you calculate it, rather than just giving the answer
5 (b) Use information from the graph to find the gross rate of photosynthesis at 20°C and
medium light intensity.
Answer ....................... (1 mark)
If you want to look at the past paper for a better quality graph it's the January 2011 unit 4 paper
Thanks in advance.
So you look at 20 on that scale and at for the medium light intensity line
then it's asking for the GROSS rate of photosynthesis.
The net rate (on the left) is telling us the overall amount of CO2 taken in for photosynthesis, the rate of respiration (on the right) is telling us the amount of CO2 given off from respiration.
So I would have thought the gross rate would = net rate + the respiration rate
As the net rate = gross - respiration rate
I'm not certain though.