plumiThe light-independent stage: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 5.2.1.4 The light-independent stage, 2016–2025, with mark schemes and examiner’s reports where available.
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All 13 questions on The light-independent stage, as a list
- June 2025, Paper 1, Q14 (1 mark): Which of the statements about the effect of reducing light intensity is/are correct? 1 The amount of glucose produced will be reduced. 2 The concentration of GP
- June 2025, Paper 1, Q15 (1 mark): Which of the statements about the effect of reducing carbon dioxide concentration is/are correct? 1 The amount of glucose produced will be increased. 2 The conc
- June 2024, Paper 1, Q13 (1 mark): Which of the statements about the effect of light intensity on the concentrations of GP, RuBP and TP is/are correct? 1 At low light intensity, less GP is conver
- June 2024, Paper 1, Q17(c)(i) (2 marks): Calvin concluded that GP was the first product of carbon fixation, and that GP was converted into TP. Use the data in Fig. 17.3 to explain how Calvin reached th
- June 2024, Paper 1, Q17(c)(ii) (1 mark): State what you can conclude from Fig. 17.3 about what happens to TP. [1]
- June 2023, Paper 1, Q9 (1 mark): The diagram shows some of the reactions that take place in a leaf cell in a flowering plant. Disaccharides and polysaccharides Glucose Hexose phosphate Hexose b
- June 2022, Paper 1, Q22(b) (5 marks): Complete the sentences using the most appropriate terms. Carbon fixation occurs in the Calvin cycle when CO2 combines with the five-carbon molecule . This forms
- November 2020, Paper 1, Q17(c) (3 marks): Algae are single-celled photosynthetic organisms. An investigation was carried out into the effect of CO2 concentration on the concentrations of ribulose bispho
- June 2019, Paper 1, Q22(a) (4 marks): Identify the molecules represented by the letters A, B, C and D in Fig. 22.1 A B C D [4]
- June 2019, Paper 1, Q22(d)(i) (2 marks): Explain why this is both an accurate and an inaccurate way to describe the light- independent stage. [2]
- June 2019, Paper 1, Q22(d)(ii) (1 mark): Name the enzyme responsible for fixing CO2 in the light-independent stage. [1]
- June 2018, Paper 3, Q3(b) (2 marks): Photosynthesis occurs in two stages: the light-dependent stage and the light-independent stage. The light-independent stage is affected by temperature more than
- June 2017, Paper 1, Q8 (1 mark): RuBisCO is an enzyme that fixes carbon dioxide in photosynthesis. In some conditions, RuBisCO also carries out oxygen fixation. The graph below shows how the ca
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