(a(i))[2]
Explain what is meant by an absorption spectrum and an action spectrum.
(a(ii))[3]
Suggest and explain why the curve shown in Fig. 9.1 for the absorption spectrum is different from the curve for the action spectrum for wavelengths of light between $450\,\text{nm}$ and $550\,\text{nm}$.
(b(i))[4]
With reference to Fig. 9.2, describe and explain the effect of temperature on the rate of photosynthesis for K. procumbens.
(b(ii))[2]
The rate of photosynthesis in this investigation was found by measuring the uptake of carbon dioxide from the atmosphere. It did not allow for the use of carbon dioxide produced by respiration. Using Fig. 9.2, calculate the rate of photosynthesis at $20\,^{\circ}\text{C}$ when the carbon dioxide produced by respiration is taken into account.