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Biology A · OCR H420 · Biological Diversity · June 2025

OCR A Level Biology A Biological Diversity June 2025 examiner report (H420/02)

2h 15m 100 marks

Examiner report

  1. Q1 - 1 mark - Water and its properties
  2. Q2 - 1 mark - Water and its properties
  3. Q3 - 1 mark - Food production using micro-organisms
  4. Q4 - 1 mark - Culturing microorganisms
  5. Q5 - 1 mark - Food production using micro-organisms
  6. Q6 - 1 mark - Osmosis
  7. Q7 - 1 mark - Classification
  8. Q8 - 1 mark - Asexual reproduction in plants
  9. Q9 - 1 mark - Gene mutations
  10. Q10 - 1 mark - Genetic engineering
  11. Q11 - 1 mark
  12. Q12 - 1 mark
  13. Q13 - 1 mark - Variation
  14. Q14 - 1 mark - Transfer of biomass
  15. Q15 - 1 mark - Human impact and biodiversity
  16. Q16 - 16 marks - Microscopy, Stem cells
  17. Q17 - 10 marks - Cloning mammals, Variation
  18. Q18 - 19 marks - Sampling and fieldwork, Species richness and index of diversity
  19. Q19 - 19 marks - Human impact and biodiversity, Maintaining biodiversity, Variation
  20. Q20 - 9 marks - Dihybrid crosses, linkage and epistasis
  21. Q21 - 12 marks