Quick answer
NEET Biology is 90 questions and 360 marks — exactly half the paper — split evenly between Botany and Zoology, drawn from NCERT Class 11 and 12. The heaviest units are Human Physiology, Genetics and Evolution, Ecology, Cell Biology and Plant Physiology, which between them account for the majority of questions. Biology is also the most NCERT-faithful subject in NEET, which makes it the highest-return section per hour studied.
Class 11 units #
| Unit | Chapters | Weight |
|---|---|---|
| Diversity in Living World | The Living World, Biological Classification, Plant Kingdom, Animal Kingdom | Medium |
| Structural Organisation | Morphology and Anatomy of Flowering Plants, Structural Organisation in Animals | Medium |
| Cell Structure and Function | Cell: The Unit of Life, Biomolecules, Cell Cycle and Cell Division | Heavy |
| Plant Physiology | Photosynthesis, Respiration in Plants, Plant Growth and Development, Transport in Plants, Mineral Nutrition | Heavy |
| Human Physiology | Digestion, Breathing, Body Fluids and Circulation, Excretory Products, Locomotion, Neural Control, Chemical Coordination | Heaviest |
Class 12 units #
| Unit | Chapters | Weight |
|---|---|---|
| Reproduction | Sexual Reproduction in Flowering Plants, Human Reproduction, Reproductive Health | Heavy |
| Genetics and Evolution | Principles of Inheritance and Variation, Molecular Basis of Inheritance, Evolution | Heaviest |
| Biology and Human Welfare | Human Health and Disease, Microbes in Human Welfare | Medium |
| Biotechnology | Principles and Processes, Applications | Medium |
| Ecology | Organisms and Populations, Ecosystem, Biodiversity and Conservation | Heavy |
💡 Tips
- Read NCERT line by line, including diagrams, tables, summaries and small-font sections. NEET Biology questions are regularly drawn verbatim from all of them.
- Three readings is the commonly reported pattern: understanding, detail, recall.
- Genetics needs practice, not just reading — it is the one Biology unit with genuine problem-solving.
- Diagram-based questions are common. Learn to label every major NCERT figure from memory.
- Ecology is high-yield and low-effort relative to its weight. Do not leave it last.
NEET Biology syllabus — frequently asked questions
How many questions come from Biology in NEET?
Ninety questions worth 360 marks, exactly half the paper, split evenly between Botany and Zoology.
Which Biology chapters have the highest weightage in NEET?
Human Physiology and Genetics and Evolution are the heaviest, followed by Ecology, Plant Physiology, Cell Biology and Reproduction.
Is NCERT enough for NEET Biology?
Very nearly. NCERT Class 11 and 12 Biology covers the overwhelming majority of what is asked, including diagrams and tables. Add a question bank for practice rather than another textbook.
Is Class 11 or Class 12 Biology more important for NEET?
Both are substantial. Class 11 carries Human Physiology, Plant Physiology and Cell Biology, while Class 12 carries Genetics, Ecology and Reproduction. Neither year can be skipped.
Which Biology unit is hardest in NEET?
Genetics, because it is the one unit requiring genuine problem-solving rather than recall. It is also among the highest-weightage units, so it repays the extra effort.
Physics and Chemistry chapter lists with weightage.
Disclaimer: Weightage figures are indicative from past-paper analysis, not official. The NMC revises the syllabus periodically.
