Biology 9700 · AS & A Level · Photosynthesis as an energy transfer process

Photosynthesis as an energy transfer process — practice question

Fig. 1.1 presents an electron micrograph of a chloroplast.
(a)[2]

On Fig. 1.1, add label lines and letters to identify one location where: L - the light-dependent stage occurs R - the enzyme rubisco is found.

(b)[2]

Chloroplasts are able to move inside palisade cells. Suggest two advantages of chloroplast movement inside palisade cells.

(c)[4]

Complete the paragraph below by naming the most suitable compounds for each gap. Rubisco is responsible for the fixation of ................................................. by RuBP (ribulose bisphosphate) in the Calvin cycle. The six carbon compound formed then splits immediately into two molecules of glycerate-3-phosphate (GP). GP is converted to triose phosphate (TP) using ................................................. and ................................................. made in the light-dependent stage. Some of the TP produced is used to regenerate ribulose bisphosphate so that the Calvin cycle can continue. The remaining TP may be used to make other compounds, including ................................................., which can go directly into the Krebs cycle.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: place label L on any thylakoid membrane

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