OCR A Level Biology B Paper 2 2025 Mark Scheme

Get the official OCR A-Level Biology B (Advancing Biology) H422/02 Scientific Literacy in Biology mark scheme from the June 2025 examination series. This examiner-approved PDF contains the exact mark allocations, indicative scientific points, level-of-response descriptors, practical-skills guidance, examiner annotations, calculation methods, and assessment-objective breakdowns used during live Summer 2025 OCR marking.

This mark scheme provides detailed examiner guidance for questions covering cereal seed dormancy, ABA and gibberellins, germination investigations, transpiration calculations, blood clotting cascades, lactate dehydrogenase electrophoresis, pancreatic histology, HbA1c conversions, semaglutide evaluation, biodiversity in solar farms, insect ecology, gametogenesis, Down’s syndrome, Chargaff’s rules, DNA extraction techniques, phosphodiester bonds, DNA replication checkpoints, radiotherapy, and umbilical cord stem cells. It includes accepted alternative answers, graphing guidance, level-of-response criteria, annotation conventions, statistical guidance, and OCR marking principles used by examiners in the live 2025 series. Pair it with the matching OCR H422/02 June 2025 question paper on markscheme.net for complete examiner-style revision and exam preparation. Updated for the 2025/2026 academic year, mobile-friendly, and instantly downloadable from markscheme.net.

This document is designed for OCR A-Level Biology B (Advancing Biology) students preparing for the 2026 examination series, Year 13 learners studying Scientific Literacy in Biology, retake students targeting A/A* grades, and home-schooled candidates seeking examiner-level insight into OCR marking expectations.

It is also essential for teachers, private tutors, revision-course providers, and parents supporting Biology revision at home. The mark scheme can be used for mock-exam grading, synoptic revision, practical-skills assessment, graph-analysis evaluation, and identifying weaknesses in OCR Biology B responses.