plumiTranslocation: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 3.1.3.5 Translocation, 2016–2025, with mark schemes and examiner’s reports where available.
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Q1(c)
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All 14 questions on Translocation, as a list
- June 2025, Paper 3, Q1(c) (3 marks): Carbohydrates produced in palisade cells are transported in phloem to sinks, such as roots. Describe how carbohydrates move from palisade cells into companion c
- June 2025, AS Paper 1, Q24(a) (3 marks): The cell surface membrane of companion cells has a key role in the loading of sucrose into phloem sieve tubes. A student wrote three incorrect statements as a p
- June 2023, AS Paper 2, Q1(b) (6 marks): (b)* Fig. 1.2 shows a diagram of phloem tissue in the stem of a herbaceous dicotyledonous plant. Fig. 1.2 Sieve pore Companion cell Sieve tube element Nucleus C
- June 2022, AS Paper 1, Q24(a)(i) (1 mark): Describe what happens inside the model, immediately after the tap on the flask is opened. [1]
- June 2022, AS Paper 1, Q24(a)(ii) (2 marks): Explain why the water level in the capillary tube starts to rise after a few minutes. [2]
- June 2022, AS Paper 1, Q24(a)(iii) (3 marks): With reference to the diagram, name the plant cells or tissues that are represented by: The capillary tube The beaker of distilled water The flask [3]
- June 2022, AS Paper 1, Q24(b) (2 marks): The student measured the increase in the level of the coloured liquid in the capillary tube after 2 minutes. It had risen by 8 mm. The capillary tube has a diam
- November 2021, Paper 1, Q20(e) (6 marks): The figure shows a potometer used to measure the rate of transpiration in a leafy shoot. leafy shoot water reservoir screw capillary tube clip air-water rubber
- June 2019, AS Paper 2, Q1(a)(i) (1 mark): Phloem tissue is made up of different cell types. Identify the type of phloem cell into which the stylet is inserted to obtain the sap. [1]
- June 2019, AS Paper 2, Q1(b)(ii) (1 mark): Suggest why sucrose is a more suitable transport molecule than glucose. [1]
- June 2018, AS Paper 1, Q14 (1 mark): During translocation of photosynthetic products in the phloem sieve tube, hydrogen ions are moved out of companion cells, then sucrose enters the companion cell
- June 2017, Paper 1, Q15 (1 mark): Mistletoe is a plant parasite that lives on the stems of other plants. It survives by removing water and assimilates from the host plant. The mistletoe binds to
- June 2016, AS Paper 1, Q25(a) (4 marks): State all the letters that provide evidence for the following conclusions: Translocation is an active process. Sugars are translocated from source to sink. [4]
- June 2016, AS Paper 1, Q25(b) (3 marks): Explain how mass flow of the phloem sap occurs in plants with a vascular system. [3]
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