OCR As Level Biology A Paper 2 2025 Mark Scheme

Get the official OCR AS Level Biology A H020/02 Depth in Biology mark scheme from the June 2025 examination series. This examiner-approved PDF contains the exact mark allocations, indicative scientific points, practical-skills guidance, calculation methods, level-of-response descriptors, and assessment-objective breakdowns used by OCR examiners to assess candidate responses in the 2025 paper.

This mark scheme provides detailed examiner guidance for questions covering chromatography, dialysis tubing diffusion experiments, facilitated diffusion, membrane permeability, exocytosis, enzyme-assisted extraction, catalase activity, Q10 calculations, classification systems, Darwin’s finches, natural selection, exchange surfaces, spirometer calculations, and gaseous exchange in mammals and fish. It includes accepted alternative answers, practical-method guidance, level-based essay descriptors, calculation tolerances, and common marking principles used during live Summer 2025 marking. Pair it with the matching OCR H020/02 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 AS Level Biology A students preparing for the 2026 examination series, Year 12 learners studying Depth 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, practical-skills assessment, classification revision, gaseous exchange analysis, and identifying weaknesses in OCR AS Biology exam technique.