Biology 9700 · AS & A Level · Investigation of limiting factors
Investigation of limiting factors — practice question
A student carried out an investigation into how temperature and light intensity affected the rate of photosynthesis in an aquatic plant. Fig. 1.1 shows the outcomes of the investigation.
(a(i))[3]
With reference to Fig. 1.1, describe the pattern shown by the investigation.
(a(ii))[2]
Suggest reasons for the results obtained at high light intensity above $30 \, ^\circ\text{C}$.
(b(i))[1]
Name the process in the light-dependent stage of photosynthesis that gives rise to oxygen.
(b(ii))[1]
Name the photosystem that is involved in oxygen production during the light-dependent stage.
(b(iii))[1]
Explain why the volume of oxygen released from the plant is not a true measure of photosynthesis rate.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “At high light intensity, raising temperature caused the volume of oxygen released / rate of photosynthesis to increase to a maximum and then decrease” …