plumiEvolution by natural selection: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 5.5.1 Evolution by natural selection, 2019–2025, with mark schemes and examiner’s reports where available.
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Q9(c)
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All 13 questions on Evolution by natural selection, as a list
- June 2025, Unit 4, Q9(c) (4 marks): The types of rice plants most susceptible to infection with RYMV are those imported from Asia into Africa. Explain why rice plants from Africa are less suscepti
- June 2024, Unit 4, Q6(c)(i) (3 marks): The scientists expected the percentage of resistant bacteria to be higher in the samples of Vibrio taken from the ponds previously treated with antibiotics. Exp
- June 2024, Unit 4, Q8(c) (6 marks): The study analysed the genomes of the Saluan people and the Bajau people to identify any genetic relationships that correlated with spleen volume. The scientist
- June 2024, Unit 5, Q8(b) (4 marks): Explain why the frequency of the BtPMaT1 gene increases in the whitefly population (paragraphs 3 and 6). (4)
- January 2024, Unit 4, Q3(c)(ii) (3 marks): Explain what had to occur for changes in these flies to be inherited. (3)
- June 2023, Unit 6, Q3(f) (2 marks): Pyrethrum is applied to fruit crops growing in fields. Suggest two reasons why applying pyrethrum to fruit crops in fields might not reduce damage to fruits. (2
- October 2022, Unit 6, Q3(c)(i) (2 marks): In breeding experiments, scientists select varieties of wheat with different characteristics. Explain why some varieties of wheat have different tolerances to a
- June 2022, Unit 4, Q5(b) (6 marks): The photographs show gerenuk and a springbok to the same magnification. gerenuk (Source: © David Havel / Alamy Stock Photo) springbok The table gives some infor
- January 2021, Unit 4, Q6(a)(i) (3 marks): Explain how flies evolve resistance to new chemicals. (3)
- January 2021, Unit 4, Q6(a)(ii) (1 mark): Suggest why the evolution of resistance to these chemicals occurs so quickly in flies. (1)
- January 2021, Unit 4, Q6(b) (6 marks): An investigation was carried out to see if the presence of stripes on cattle reduced the number of biting flies on their bodies. Three groups of black cattle we
- October 2020, Unit 4, Q6(c) (3 marks): Suggest how ground squirrels evolved pouches. (3)
- January 2020, Unit 4, Q2(a)(ii) (3 marks): Explain how microorganisms could evolve to break down plastics. (3)
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