Cell structure and organisation
63 past-paper questions on Cell structure and organisation · examined 2020–2025.
20258 questions
1 What is a function of a plant cell wall? A to control loss of ions from the cell B to control movement of glucose into the cell C to prevent evaporation of water from the cell D to prevent the cell bursting when water enters
11 The diagrams show sections through a dicotyledonous root, stem and leaf. The vascular tissues are labelled using numbers 1– 6. root stem leaf 1 2 3 4 5 6 The ends of pieces of roots, stems and leaf stalks are placed in water containing a red dye. After several hours, the coloured water has travelled along some of the vascular tissues. Which vascular tissues appear red? root stem leaf A 1 3 6 B 1 4 5 C 2 4 6 D 2 3 5
1 Which row identifies structures X and Y on the plant cell diagram? X Y structure X structure Y A chloroplast mitochondrion B chloroplast ribosome C nucleus chloroplast D mitochondrion ribosome
© UCLES 2025 5090/12/O/N/25 3 Which statement about osmosis is correct? A An animal cell immersed in distilled water will shrink. B A plant cell immersed in distilled water will become flaccid. C A plant cell immersed in a strong sodium chloride solution will become turgid. D A plant cell immersed in a strong sodium chloride solution will become plasmolysed. 3
© UCLES 2025 5090/12/O/N/25 9 Why do newly germinated seeds fail to grow into healthy plants if they lack magnesium ions? A Magnesium ions are a necessary component of all proteins. B Magnesium ions are needed to convert chlorophyll to starch. C Magnesium ions are needed to form cell walls. D Magnesium ions are needed to form chlorophyll molecules. 5
29 The diagrams show some plant and animal cells. They are not drawn to the same scale. Which cells contain haploid nuclei? A B C D
5090/21/O/N/25 © UCLES 2025 7 HIV and MRSA are two different microorganisms which are pathogens. (a) (i) Put ticks ( ✓ ) in Table 7.1 to show the characteristics of each pathogen. Table 7.1 characteristic HIV MRSA is a living cell contains cytoplasm contains genetic material has a protein coat [2] (ii) Describe how HIV affects the human immune system. ........................................................................................................................................... ..........................................................................................................
Name parts A and B.
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