Which chapters have the highest weightage in NEET?

Counted across the 7 complete papers on this site, the heaviest chapters are Molecular Basis of Inheritance, Biotechnology: Principles and Processes, Principles of Inheritance and Variation, Biomolecules, Cell Cycle and Cell Division and Current Electricity — each carrying roughly 2 to 4 per cent of the questions. No single chapter dominates, which is why a plan built around a few favourites tends to fail.

How is this chapter-wise weightage calculated?

By counting every question from the previous-year papers transcribed on this site — 1222 of them — mapping each to its NCERT chapter, and dividing. Only papers held at 95 per cent or more of their questions are counted, and the coverage of each is shown on the page above the results.

Does high weightage mean I should study that chapter first?

Not on its own. Weightage tells you how often a chapter has appeared, not how many marks you can reliably earn from it. With −1 for a wrong answer, a heavy chapter you half-know can cost more than a lighter one you know completely.

Is the weightage the same every year?

No. These are counts from past papers, not a forecast, and the mix moves between years. Treat them as where the questions have been, not where the next ones must be.

NEET chapter-wise weightage

Every page that answers this question gives you a range. This one gives you a count — of 1222 questions from 7 complete previous-year papers, each mapped to its NCERT chapter. The papers, and how much of each one we hold, are listed first so you can judge the number before you read it.

The papers this is counted from

Paper	Questions held	Coverage	Counted?
NEET 2025	178 of 180	99%	yes
NEET 2024	200 of 200	100%	yes
NEET 2023	198 of 200	99%	yes
NEET 2022	199 of 200	100%	yes
NEET 2021	200 of 200	100%	yes
NEET 2020	180 of 180	100%	yes
NEET 2019	176 of 180	98%	yes

A paper is counted only when we hold at least 95% of its questions. Counting a paper we hold a third of would pull every chapter it happens to touch upward and every chapter it misses down, invisibly. Of the 1331 questions in the counted papers, 1222 are mapped to a chapter; the remaining 109 are not yet mapped and are excluded from the percentages below.

The paper, drawn to scale

One band per subject, each as tall as that subject’s share. Every chapter inside is as wide as its share of the subject — so a rectangle’s area is its share of the paper.

Every rectangle’s area is that topic’s share of the subject paper, counted from 7 complete previous-year papers — 1222 questions in all. The whole frame is one paper. Bands run largest unit to smallest; cells too small to letter are named in the table below.

Weightage by chapter

Chapter	Subject	Class	Questions	Share
Molecular Basis of Inheritance	Botany	12	45	3.7%
Biotechnology: Principles and Processes	Zoology	12	36	2.9%
Principles of Inheritance and Variation	Botany	12	33	2.7%
Biomolecules	Zoology	11	28	2.3%
Cell Cycle and Cell Division	Botany	11	26	2.1%
Current Electricity	Physics	12	26	2.1%
Human Reproduction	Zoology	12	25	2%
Animal Kingdom	Zoology	11	24	2%
Plant Kingdom	Botany	11	23	1.9%
Cell: The Unit of Life	Botany	11	23	1.9%
Human Health and Disease	Zoology	12	23	1.9%
Sexual Reproduction in Flowering Plants	Botany	12	22	1.8%
Structural Organisation in Animals	Zoology	11	22	1.8%
Plant Growth and Development	Botany	11	21	1.7%
Morphology of Flowering Plants	Botany	11	21	1.7%
The p-Block Elements	Chemistry	12	21	1.7%
Hydrocarbons	Chemistry	11	20	1.6%
Aldehydes, Ketones and Carboxylic Acids	Chemistry	12	19	1.6%
Chemical Bonding and Molecular Structure	Chemistry	11	19	1.6%
Ray Optics and Optical Instruments	Physics	12	19	1.6%
Electrostatic Potential and Capacitance	Physics	12	19	1.6%
Evolution	Zoology	12	19	1.6%
Semiconductor Electronics	Physics	12	19	1.6%
Organisms and Populations	Botany	12	18	1.5%
Units and Measurements	Physics	11	18	1.5%
Biotechnology and its Applications	Zoology	12	18	1.5%
Anatomy of Flowering Plants	Botany	11	18	1.5%
Biodiversity and Conservation	Botany	12	17	1.4%
Ecosystem	Botany	12	16	1.3%
Reproductive Health	Zoology	12	16	1.3%
Moving Charges and Magnetism	Physics	12	16	1.3%
Dual Nature of Radiation and Matter	Physics	12	16	1.3%
Photosynthesis in Higher Plants	Botany	11	15	1.2%
Chemical Coordination and Integration	Zoology	11	15	1.2%
Chemical Kinetics	Chemistry	12	15	1.2%
Thermodynamics	Chemistry	11	15	1.2%
System of Particles and Rotational Motion	Physics	11	15	1.2%
Equilibrium	Chemistry	11	14	1.1%
Alternating Current	Physics	12	14	1.1%
Coordination Compounds	Chemistry	12	14	1.1%
The d- and f-Block Elements	Chemistry	12	14	1.1%
Breathing and Exchange of Gases	Zoology	11	13	1.1%
Body Fluids and Circulation	Zoology	11	13	1.1%
Structure of Atom	Chemistry	11	13	1.1%
Electrochemistry	Chemistry	12	13	1.1%
Respiration in Plants	Botany	11	12	1%
Biological Classification	Botany	11	12	1%
Gravitation	Physics	11	12	1%
Solutions	Chemistry	12	12	1%
Work, Energy and Power	Physics	11	12	1%
Electromagnetic Waves	Physics	12	12	1%
Microbes in Human Welfare	Botany	12	12	1%
Oscillations	Physics	11	12	1%
Some Basic Concepts of Chemistry	Chemistry	11	11	0.9%
Biomolecules	Chemistry	12	11	0.9%
Laws of Motion	Physics	11	11	0.9%
Amines	Chemistry	12	11	0.9%
Organic Chemistry: Some Basic Principles and Techniques	Chemistry	11	11	0.9%
Motion in a Straight Line	Physics	11	11	0.9%
Locomotion and Movement	Zoology	11	11	0.9%
Excretory Products and their Elimination	Zoology	11	10	0.8%
Kinetic Theory	Physics	11	10	0.8%
Mechanical Properties of Fluids	Physics	11	10	0.8%
Nuclei	Physics	12	10	0.8%
Alcohols, Phenols and Ethers	Chemistry	12	10	0.8%
Electric Charges and Fields	Physics	12	9	0.7%
Haloalkanes and Haloarenes	Chemistry	12	9	0.7%
Wave Optics	Physics	12	9	0.7%
Electromagnetic Induction	Physics	12	8	0.7%
Atoms	Physics	12	8	0.7%
Classification of Elements and Periodicity in Properties	Chemistry	11	7	0.6%
Motion in a Plane	Physics	11	7	0.6%
Redox Reactions	Chemistry	11	6	0.5%
Purification and Characterisation of Organic Compounds	Chemistry	11	6	0.5%
Mechanical Properties of Solids	Physics	11	6	0.5%
Thermodynamics	Physics	11	6	0.5%
Thermal Properties of Matter	Physics	11	6	0.5%
Magnetism and Matter	Physics	12	6	0.5%
Neural Control and Coordination	Zoology	11	6	0.5%
The Living World	Botany	11	4	0.3%
Waves	Physics	11	4	0.3%
Principles Related to Practical Chemistry	Chemistry	12	3	0.2%

What this does not tell you

It is not a forecast. These are counts from papers already sat. The mix moves between years, and a chapter that carried six questions last year is not owed six this year.
Weightage is not marks. A wrong answer costs one mark, so a heavy chapter you half-know can return less than a light one you know completely. Frequency tells you where questions have been, not where your marks are.
The mapping is ours, not NTA’s. Each question was assigned to a chapter by hand. A question sitting across two chapters was filed under one, and reasonable people would file some of them differently.
7 papers is a small sample. Enough to see the shape, not enough to separate a 5% chapter from a 4% one. Read the ordering, not the decimal.

Act on it rather than reading it

Every question counted above is on this site with all four options and the correct answer, free and without an account.

Browse the questions The syllabus, with free video lectures Sit a full paper

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Citing this

Quoting these figures somewhere? Every one is linked to the document it came from, so the number can be checked rather than taken on trust.

NEETLogic, "NEET chapter-wise weightage, counted from previous-year papers", 7 September 2026. https://neetlogic.in/pyq/weightage

Common questions

Which chapters have the highest weightage in NEET?: Counted across the 7 complete papers on this site, the heaviest chapters are Molecular Basis of Inheritance, Biotechnology: Principles and Processes, Principles of Inheritance and Variation, Biomolecules, Cell Cycle and Cell Division and Current Electricity — each carrying roughly 2 to 4 per cent of the questions. No single chapter dominates, which is why a plan built around a few favourites tends to fail.
How is this chapter-wise weightage calculated?: By counting every question from the previous-year papers transcribed on this site — 1222 of them — mapping each to its NCERT chapter, and dividing. Only papers held at 95 per cent or more of their questions are counted, and the coverage of each is shown on the page above the results.
Does high weightage mean I should study that chapter first?: Not on its own. Weightage tells you how often a chapter has appeared, not how many marks you can reliably earn from it. With −1 for a wrong answer, a heavy chapter you half-know can cost more than a lighter one you know completely.
Is the weightage the same every year?: No. These are counts from past papers, not a forecast, and the mix moves between years. Treat them as where the questions have been, not where the next ones must be.