The photoactivation of chlorophyll is an essential process in the conversion of light energy to chemical energy during the light‑dependent stage of photosynthesis. Photoactivation of chlorophyll leads to the synthesis of ATP. Outline how the photoactivation of chlorophyll leads to the production of ATP.

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10(b)(i)Light Reactions Calvin CycleEasy2 marks

ATP produced in the light-dependent stage passes to the Calvin cycle of the light-independent stage.

Which two compounds in the Calvin cycle are formed using this ATP?

Two answers required.

10(b)(ii)Light Reactions Calvin CycleEasy2 marks

Reduced NADP is also produced in the light‑dependent stage. Outline the role of reduced NADP in the light‑independent stage.

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10(b)(iii)Light Reactions Calvin CycleEasy1 mark

Some glycerate 3-phosphate (GP) molecules produced in the Calvin cycle are used to produce a type of molecule that is not an intermediate in the Calvin cycle.

Which type of molecule can be produced from GP that is not an intermediate in the Calvin cycle?

10(c)Limiting Factors PhotosynthesisMedium3 marks

Environmental factors affect the rate of photosynthesis. Figure 10.1 shows the effect of carbon dioxide concentration on the rate of photosynthesis.

Figure 10.1, a line graph of rate of photosynthesis (vertical axis, unlabelled scale) against carbon dioxide concentration (horizontal axis, unlabelled scale): the curve rises steeply and roughly linearly from the origin, then curves over and levels off into a horizontal plateau at higher carbon dioxide concentrations.

Explain the reasons for the relationship shown in Figure 10.1.

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