Which Biology chapters carry the most weight in NEET 2026?

Biology is the most important subject in NEET, contributing 50% of the paper (90 questions = 360 marks out of 720). Since Biology decides ranks, students preparing for NEET 2026 must focus on the high-scoring Biology chapters that carry maximum weightage based on previous year trends and NCERT analysis.

High-Scoring Class 11 Biology Chapters

1. Human Physiology (10–12 questions) – Digestion, Respiration, Circulation, Excretion, Nervous System.
2. Plant Physiology (7–9 questions) – Photosynthesis, Respiration, Plant Growth & Hormones.
3. Cell Structure & Function (5–6 questions).
4. Diversity of Living Organisms (5–7 questions) – Animal Kingdom, Plant Kingdom, Biological Classification.
5. Structural Organisation in Animals (2–3 questions).

High-Scoring Class 12 Biology Chapters

1. Genetics & Evolution (12–14 questions) – Mendel’s laws, molecular basis of inheritance, DNA replication, evolution theories.
2. Ecology & Environment (10–12 questions) – Ecosystem, Biodiversity, Environmental issues.
3. Reproduction (8–9 questions) – Reproduction in Organisms, Human Reproduction, Reproductive Health.
4. Biology & Human Welfare (6–7 questions) – Human Health & Disease, Microbes in Human Welfare.
5. Biotechnology (5–6 questions) – Principles, Applications, Genetic Engineering.

Weightage Summary (Approx.)

Key Strategy for NEET 2026 Biology

• Read NCERT line by line – almost 80–85% of Biology questions are directly NCERT-based.
• Make NCERT diagrams, tables, and flowcharts part of your daily revision.
• Prioritize Genetics, Human Physiology, Ecology, and Reproduction for maximum marks.
• Solve previous year questions (PYQs) to understand recurring patterns.
• Use flashcards/Night Cards for factual chapters (Plant Physiology, Diversity, Bio-welfare).

In short, if you want to maximize your Biology score in NEET 2026, focus first on Genetics, Ecology, Human Physiology, and Reproduction—these four areas alone can cover 40–45% of Biology marks.