GCE A-Level - Higher 2 (H2) · Biology (9477)

Photosynthesis as an energy-trapping process: Practice Questions

5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Photosynthesis as an energy-trapping process.

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Question 1

1 mark

What are the two main products of the light-dependent reactions that are essential for the reduction of glycerate-3-phosphate (PGA) in the Calvin cycle?

Question 2

1 mark

Which statement correctly distinguishes between the absorption spectrum and the action spectrum of photosynthetic pigments?

Question 3

1 mark

During the light-dependent reactions of photosynthesis, what is the immediate source of electrons to replace those lost by the reaction center chlorophyll in Photosystem II?

Question 4

1 mark

Which of the following describes the role of the thylakoid membrane in the light-dependent reactions of photosynthesis?

Question 5

1 mark

In C3 plants, the enzyme rubisco catalyzes the fixation of carbon dioxide. Which molecule does carbon dioxide combine with at the start of the Calvin cycle?

Question 6

5 marks

During the Calvin cycle, the enzyme Rubisco can bind to both \(CO_{2}\) and \(O_{2}\). Explain how an increase in global temperatures might decrease the efficiency of photosynthesis in C3 plants through this enzymatic property.

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