(a)[2]
State all the bonds that are likely to maintain the shape of a rubisco molecule.
(b)[1]
Suggest how rubisco activase can activate rubisco.
(c(i))[3]
Describe and explain how the leaf anatomy of C4 plants such as maize enables high rates of carbon fixation at high temperatures.
(c(ii))[2]
Suggest why the rate of photorespiration rises at high light intensities in C3 plants.
(c(iii))[2]
Explain why the rate of photosynthesis falls as a result of photorespiration in C3 plants.
(ii)[2]
In C3 plants, photorespiration rises at high light intensities as well as at high temperatures. Suggest why the rate of photorespiration rises at high light intensities in C3 plants.
(iii)[2]
Explain why photorespiration makes the rate of photosynthesis fall in C3 plants.