Question
What is the chapter-wise weightage for Biology in NEET? Which chapters carry the most marks, and how should I plan my preparation?
(NEET preparation strategy)
Solution — Step by Step
Biology in NEET has 90 questions (Botany 45 + Zoology 45), totalling 360 marks — the single largest section.
| Chapter | Avg. questions | Weightage |
|---|---|---|
| Genetics and Heredity | 8-10 | ~10% |
| Human Physiology (all) | 10-12 | ~13% |
| Ecology and Environment | 6-8 | ~8% |
| Plant Physiology | 5-7 | ~7% |
| Cell Biology | 5-6 | ~6% |
| Biomolecules | 3-4 | ~4% |
| Reproduction | 5-6 | ~6% |
| Animal Kingdom + Morphology | 5-7 | ~7% |
| Molecular Basis of Inheritance | 4-5 | ~5% |
| Biotechnology | 3-4 | ~4% |
| Evolution | 2-3 | ~3% |
| Microbes | 2-3 | ~3% |
About 60-65% of questions come from just 6 chapters: Genetics, Human Physiology, Ecology, Plant Physiology, Reproduction, and Animal Kingdom.
Mastering these 6 chapters thoroughly (including NCERT line-by-line for these) gives you a strong scoring base. The remaining chapters add breadth but carry lower individual weightage.
Tier 1 — Must master (60% weightage): Genetics, Human Physiology, Ecology, Reproduction, Plant Physiology, Animal Kingdom
Tier 2 — Important (25% weightage): Cell Biology, Molecular Basis of Inheritance, Biotechnology, Biomolecules
Tier 3 — Complete syllabus (15% weightage): Evolution, Microbes in Human Welfare, Plant Anatomy, Biodiversity
Priority Chapters Decision Tree
flowchart TD
A["NEET Biology — 90 Questions"] --> B["Tier 1: Master first"]
A --> C["Tier 2: Study thoroughly"]
A --> D["Tier 3: Complete coverage"]
B --> B1["Genetics: 8-10 Qs"]
B --> B2["Human Physiology: 10-12 Qs"]
B --> B3["Ecology: 6-8 Qs"]
B --> B4["Reproduction: 5-6 Qs"]
B --> B5["Plant Physiology: 5-7 Qs"]
C --> C1["Cell Biology: 5-6 Qs"]
C --> C2["Molecular Inheritance: 4-5 Qs"]
C --> C3["Biotechnology: 3-4 Qs"]
D --> D1["Evolution: 2-3 Qs"]
D --> D2["Microbes: 2-3 Qs"]
D --> D3["Plant Anatomy: 2-3 Qs"]Why This Works
NEET Biology is heavily NCERT-dependent. Nearly 85-90% of questions can be answered directly from NCERT textbook lines. The weightage data tells us which chapters NTA pulls more questions from, so we prioritise those for deeper revision.
Human Physiology is the single most tested area because it covers multiple organ systems — each can generate several factual and application questions. Genetics combines both theory and problem-solving, making it a high-frequency testing ground.
Common Mistake
The biggest mistake NEET aspirants make: studying from reference books before finishing NCERT. NEET questions are framed using NCERT language. Students who read Trueman’s or Dinesh but skip NCERT often know the concept but miss the specific term or phrasing the question uses. Read NCERT line by line first, then use reference books only for practice questions.
Highlight every bold term, every diagram label, and every table in NCERT Biology. NEET has asked questions from figure captions and table footnotes. Nothing in NCERT is filler — treat every line as a potential question.