OCR A Level Biology B Paper 1 2025 Mark Scheme

Get the official OCR A-Level Biology B (Advancing Biology) H422/01 Fundamentals of 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, and assessment-objective breakdowns used during live Summer 2025 OCR marking.

This mark scheme provides detailed examiner guidance for questions covering nervous-system organisation, autonomic control, HIV transmission, HIV vaccine ethics, transpiration investigations, soybean root nodules, skeletal muscle ultrastructure, ultrafiltration in nephrons, dialysis quality-of-life analysis, frontotemporal dementia, DNA methylation, MRI and EEG scanning, Hardy–Weinberg calculations, photosynthesis, meiosis, ATP, alveoli, and chronic disease. It includes accepted alternative answers, graphing guidance, calculation tolerances, annotation conventions, and OCR marking principles used by examiners in the live 2025 series. Pair it with the matching OCR H422/01 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 Fundamentals of 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, practical-skills assessment, synoptic revision, data-analysis evaluation, and identifying weaknesses in OCR Biology B responses.