OCR A Level Biology A Paper 3 2025 Question Paper

Get the official OCR A-Level Biology A H420/03 Unified Biology June 2025 question paper used in the Summer 2025 OCR examination series. This authentic examiner-issued PDF contains structured, practical, data-analysis, genetics, immunity, physiology, and synoptic biology questions exactly as presented to candidates during the live assessment.

This paper includes exam questions on plant transport systems, root hair cell surface area calculations, beta blockers and cardiovascular disease, muscle tissue structure and contraction, myasthenia gravis, RNA and DNA, electrophoresis, genetic engineering, osmosis in plant tissue, β-thalassemia gene editing, climate change and vector-borne disease, neutrophils, immunity, and plant defence mechanisms. Pair it with the matching OCR H420/03 June 2025 mark scheme 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 A students preparing for the 2026 examination series, Year 13 learners studying Unified Biology, retake students targeting top grades, and home-schooled candidates seeking authentic OCR exam practice under timed conditions.

It is also ideal for teachers, private tutors, revision-course providers, and parents supporting Biology revision at home. The question paper can be used for mock examinations, synoptic revision sessions, practical-skills preparation, exam-technique training, and identifying weaknesses across OCR Biology A modules.