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

Photosynthesis as an energy transfer process — practice question

Fig. 7.1 shows a transmission electron micrograph of a section of a chloroplast from a maize leaf cell.
(a)[3]

Use A or B from Fig. 7.1 to finish Table 7.1 so that it shows the location where each of the following substrates or products is used or made: oxygen produced; carbon dioxide used; reduced NADP used; ATP produced; hexose produced.

(b(i))[2]

Explain the outcome for test-tube 2.

(b(ii))[1]

Test-tube 1 serves as a control tube. Explain why it was included in the investigation.

(b(iii))[2]

Suggest and explain what would happen to chloroplasts if they were placed in distilled water.

(c)[2]

The rate of photosynthesis in green plants may be limited by factors such as light intensity, temperature and carbon dioxide concentration. State which factor would not affect the reducing ability of a chloroplast suspension. Give a reason for your answer.

(i)[2]

Explain the outcome for test-tube 2.

(ii)[1]

Test-tube 1 acts as a control tube. Explain why it was included in the investigation.

(iii)[2]

Suggest and explain what would happen to chloroplasts if they were placed in distilled water.

Worked solution & mark scheme

This 15-mark question has a full step-by-step worked solution and mark scheme. One marking point: Accurate locations for products/substrates

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