plumiThe light-dependent stage: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 5.2.1.3 The light-dependent stage, 2016–2025, with mark schemes and examiner’s reports where available.
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Q4(c)(i)
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All 11 questions on The light-dependent stage, as a list
- June 2024, Paper 3, Q4(c)(i) (2 marks): Evidence for chemiosmosis during photosynthesis can be demonstrated by: • isolating chloroplasts from plant cells • placing the chloroplasts in an acidic soluti
- June 2024, Paper 3, Q4(c)(ii) (2 marks): André Jagendorf provided evidence for chemiosmosis in an experiment carried out in the 1960s. In his experiment, Jagendorf: • broke open chloroplasts to expose
- June 2023, Paper 3, Q3(a)(i) (1 mark): State one dependent variable in this investigation. [1]
- June 2023, Paper 3, Q3(a)(ii) (2 marks): Explain the effect of genetic modification on the rate of CO2 fixation after 150 seconds of low light intensity. [2]
- November 2021, Paper 1, Q19(a)(i) (1 mark): State the name of the final electron acceptor in the light-dependent stage of photosynthesis. [1]
- November 2021, Paper 1, Q19(a)(ii) (2 marks): DCPIP is reduced in the Hill reaction. Suggest and explain the function of DCPIP in the Hill reaction. [2]
- November 2021, Paper 1, Q19(a)(iii) (4 marks): Using the results shown in the table, explain what can be concluded from each tube, or pair of tubes, about the light-dependent stage of photosynthesis. Tube A
- November 2021, Paper 1, Q19(a)(iv) (2 marks): The student knew that it was important to use sucrose solution when homogenising the leaves. Explain why it was important that the pellet was suspended in buffe
- November 2021, Paper 1, Q19(a)(v) (4 marks): Suggest and explain two improvements that would increase the validity of the method. Improvement 1 Explanation Improvement 2 Explanation [4]
- June 2018, Paper 1, Q11 (1 mark): Which of the following, A to D, is a similarity in the way ATP is made in respiration and photosynthesis? A both involve NAD B both involve substrate level phos
- June 2017, Paper 1, Q2 (1 mark): Which of the images, A to D, correctly summarises photosynthesis? A B reduced reduced light light light light NAD NAD independent dependent dependent independen
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