NEET UG · Biology · 2017–2026

NEET Biology: chapter-wise weightage

All 940 Biology questions from ten NEET papers, by chapter, unit and topic. Which chapters carry the marks, how the questions have changed, and what is rising.

Questions in 10 years: 940; 50% of every paper
Chapters in the syllabus: 32; 5 dropped since 2024
Chapters for half the marks: 12; ranked by ten-year share
From Class 12: 49%; 2026: 57%
Easy: 61%; hard: 1.0%
Need a calculation: 3%; 2026: 8%
Use a figure: 1%; 2026: 0%
Per paper: 94; questions, on average

Key findings · NEET Biology

1
12 of 32 chapters carry half of the Biology weightage. The top five hold 26%: Molecular Basis of Inheritance; Biotechnology: Principles and Processes; Principles of Inheritance and Variation; Sexual Reproduction in Flowering Plants; Cell: The Unit of Life.
2
Human Health and Disease is rising fastest: 4.8 questions a paper since 2024, up from 2.5 before.
3
Anatomy of Flowering Plants has fallen most: 1.2 a paper since 2024, down from 2.9.
4
64% of Biology questions were easy in 2026, against 61% across ten years.
5
Botany had 520 questions and Zoology 420 over ten years; in 2026 the split was 50 to 40.

Chapter weightage

Every Biology chapter, ranked

Share is the chapter's average share of the whole paper. “Weighted est.” is a model: a weighted average of past papers with recent ones counting more, scaled to 180 questions. A guide to effort, not a forecast.

Right: weighted estimate (model), and the change since 2024.

#	Chapter	Class	Share	Asked (10 yrs)	Years asked	Since 2024	Trend	Weighted est.
1	Molecular Basis of InheritanceGenetics and Evolution	12	3.2%	61	10/10	5.1 vs 6.1	-1.0	5.8
2	Biotechnology: Principles and ProcessesBiotechnology	12	2.5%	46	10/10	4.8 vs 4.2	+0.6	4.9
3	Cell: The Unit of LifeCell Structure and Function	11	1.9%	36	10/10	4.9 vs 2.9	+2.0	4.2
4	Principles of Inheritance and VariationGenetics and Evolution	12	2.3%	43	10/10	3.8 vs 4.3	-0.5	4.1
5	Human ReproductionReproduction	12	1.8%	33	10/10	4.2 vs 2.7	+1.5	3.9
6	Human Health and DiseaseHuman Physiology	12	1.8%	33	10/10	4.8 vs 2.5	+2.3	3.9
7	Sexual Reproduction in Flowering PlantsReproduction	12	2.0%	37	10/10	3.9 vs 3.5	+0.5	3.8
8	Animal KingdomDiversity in Living World	11	1.8%	34	10/10	3.9 vs 3.0	+0.9	3.7
9	BiomoleculesCell Structure and Function	11	1.7%	33	10/10	3.8 vs 2.8	+1.0	3.6
10	Organisms and PopulationsEcology and Environment	12	1.6%	31	9/10	3.3 vs 2.9	+0.4	3.4
11	EvolutionGenetics and Evolution	12	1.5%	28	10/10	3.5 vs 2.4	+1.2	3.2
12	Cell Cycle and Cell DivisionCell Structure and Function	11	1.7%	32	10/10	2.2 vs 3.4	-1.2	3.0
13	Plant KingdomDiversity in Living World	11	1.7%	31	10/10	2.6 vs 3.1	-0.5	3.0
14	Morphology of Flowering PlantsStructural Organization	11	1.5%	28	10/10	3.2 vs 2.5	+0.7	3.0
15	Structural Organisation in AnimalsPart droppedStructural Organization	11	1.4%	27	10/10	3.2 vs 2.3	+0.9	3.0
16	Chemical Coordination and IntegrationHuman Physiology	11	1.3%	24	10/10	3.6 vs 1.8	+1.8	2.9
17	Photosynthesis in Higher PlantsPlant Physiology	11	1.2%	23	9/10	3.2 vs 1.8	+1.5	2.9
18	Biological ClassificationDiversity in Living World	11	1.4%	26	9/10	2.6 vs 2.5	0.1	2.6
19	Plant Growth and DevelopmentPlant Physiology	11	1.2%	23	9/10	2.6 vs 2.0	+0.6	2.6
20	Biodiversity and ConservationEcology and Environment	12	1.2%	22	9/10	2.5 vs 1.9	+0.6	2.2
21	Biotechnology and its ApplicationsBiotechnology	12	1.3%	24	9/10	1.6 vs 2.6	-1.0	2.1
22	Body Fluids and CirculationHuman Physiology	11	1.1%	21	10/10	1.9 vs 2.1	-0.1	2.1
23	EcosystemEcology and Environment	12	1.1%	20	10/10	2.0 vs 1.9	0.1	2.1
24	Reproductive HealthReproduction	12	1.2%	22	10/10	1.6 vs 2.3	-0.7	2.0
25	Locomotion and MovementHuman Physiology	11	1.0%	19	9/10	1.6 vs 1.9	-0.3	2.0
26	Anatomy of Flowering PlantsStructural Organization	11	1.3%	25	9/10	1.2 vs 2.9	-1.6	1.9
27	Microbes in Human WelfareBiotechnology	12	0.9%	16	9/10	1.6 vs 1.6	0.1	1.5
28	Excretory Products and their EliminationHuman Physiology	11	0.9%	16	9/10	1.3 vs 1.7	-0.4	1.5
29	Respiration in PlantsPlant Physiology	11	0.8%	15	10/10	1.3 vs 1.5	-0.2	1.4
30	Breathing and Exchange of GasesHuman Physiology	11	0.9%	17	9/10	0.9 vs 1.9	-1.0	1.3
31	Neural Control and CoordinationPart droppedHuman Physiology	11	0.8%	15	8/10	0.9 vs 1.7	-0.7	1.2
32	The Living WorldDiversity in Living World	11	0.5%	9	7/10	1.3 vs 0.7	+0.7	1.2

Dropped from the NEET UG 2026 syllabus: Environmental Issues (19), Digestion and Absorption (15), Transport in Plants (13), Mineral Nutrition (12), Strategies for Enhancement in Food Production (11).

Drill down

Chapter, topic, idea, question

Every Biology chapter, opened all the way down: its topics, the ideas inside them, and the questions themselves.

chapterAskedShareYears’17’18’19’20’21’22’23’24’25’26

Open61 · 6%6%10/106654978682
Open46 · 5%5%10/10536655564
Open43 · 5%5%10/105454265633
Open37 · 4%4%10/106343333354
Open36 · 4%4%10/102452422447
Open34 · 4%4%10/103324523444
Open33 · 4%4%10/10224444642
Open33 · 4%4%10/10234323654
Open33 · 4%4%10/102423333355
Open32 · 3%3%10/10222454642
Open31 · 3%3%9/10262434244
Open31 · 3%3%10/10432353352
Open28 · 3%3%10/103442246
Open28 · 3%3%10/10423233433
Open27 · 3%3%10/1023334442

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Year by year

Every chapter in every paper

Questions per chapter in each year's paper, chapters in the 2026 syllabus, highest weighted estimate first.

Molecular Basis of Inheritance61
6654978682
Biotechnology: Principles and Processes46
5136655564
Cell: The Unit of Life36
2452422447
Principles of Inheritance and Variation43
5454265633
Human Reproduction33
2423333355
Human Health and Disease33
2343123654
Sexual Reproduction in Flowering Plants37
6343333354
Animal Kingdom34
3324523444
Biomolecules33
2124444642
Organisms and Populations31
262434244
Evolution28
1344221416
Cell Cycle and Cell Division32
2224546412
Plant Kingdom31
4323533152
Morphology of Flowering Plants28
4213233433
Structural Organisation in Animals27
1123334442
Chemical Coordination and Integration24
2232112353
Photosynthesis in Higher Plants23
212233325
Biological Classification26
463113215
Plant Growth and Development23
123333323
Biodiversity and Conservation22
313232521
Biotechnology and its Applications24
423631221
Body Fluids and Circulation21
3222222213
Ecosystem20
2112332132
Reproductive Health22
3132323212
Locomotion and Movement19
212133214
Anatomy of Flowering Plants25
343233331
Microbes in Human Welfare16
214211131
Excretory Products and their Elimination16
222213211
Respiration in Plants15
1221122211
Breathing and Exchange of Gases17
132232121
Neural Control and Coordination15
33211221
The Living World9
1111113

’17’18’19’20’21’22’23’24’25’26

Chapter	2017	’18	2019	’20	2021	’22	2023	’24	2025	’26	Total
Molecular Basis of Inheritance	6	6	5	4	9	7	8	6	8	2	61
Biotechnology: Principles and Processes	5	1	3	6	6	5	5	5	6	4	46
Cell: The Unit of Life	2	4	5	2	4	2	2	4	4	7	36
Principles of Inheritance and Variation	5	4	5	4	2	6	5	6	3	3	43
Human Reproduction	2	4	2	3	3	3	3	3	5	5	33
Human Health and Disease	2	3	4	3	1	2	3	6	5	4	33
Sexual Reproduction in Flowering Plants	6	3	4	3	3	3	3	3	5	4	37
Animal Kingdom	3	3	2	4	5	2	3	4	4	4	34
Biomolecules	2	1	2	4	4	4	4	6	4	2	33
Organisms and Populations	2	6	·	2	4	3	4	2	4	4	31
Evolution	1	3	4	4	2	2	1	4	1	6	28
Cell Cycle and Cell Division	2	2	2	4	5	4	6	4	1	2	32
Plant Kingdom	4	3	2	3	5	3	3	1	5	2	31
Morphology of Flowering Plants	4	2	1	3	2	3	3	4	3	3	28
Structural Organisation in Animals	1	1	2	3	3	3	4	4	4	2	27
Chemical Coordination and Integration	2	2	3	2	1	1	2	3	5	3	24
Photosynthesis in Higher Plants	2	1	·	2	2	3	3	3	2	5	23
Biological Classification	4	6	3	1	1	3	·	2	1	5	26
Plant Growth and Development	1	·	2	3	3	3	3	3	2	3	23
Biodiversity and Conservation	3	1	3	2	·	3	2	5	2	1	22
Biotechnology and its Applications	·	4	2	3	6	3	1	2	2	1	24
Body Fluids and Circulation	3	2	2	2	2	2	2	2	1	3	21
Ecosystem	2	1	1	2	3	3	2	1	3	2	20
Reproductive Health	3	1	3	2	3	2	3	2	1	2	22
Locomotion and Movement	2	1	2	1	3	3	2	1	·	4	19
Anatomy of Flowering Plants	3	4	3	2	3	3	3	3	1	·	25
Microbes in Human Welfare	2	1	4	2	1	1	·	1	3	1	16
Excretory Products and their Elimination	2	2	2	2	·	1	3	2	1	1	16
Respiration in Plants	1	2	2	1	1	2	2	2	1	1	15
Breathing and Exchange of Gases	1	3	2	2	3	2	1	2	1	·	17
Neural Control and Coordination	3	3	2	1	·	1	2	2	·	1	15
The Living World	1	1	1	·	1	1	·	·	1	3	9

09+questions in that year’s paper

Units

Units, ranked

Chapters grouped into NEET syllabus units. Share of the subject's ten-year questions.

Biology units

SHARE OF 10 YEARS

Human Physiology · 7 chapters · ~14.9 expected17%
Genetics and Evolution · 3 chapters · ~13.1 expected15%
Cell Structure and Function · 3 chapters · ~10.8 expected12%
Diversity in Living World · 4 chapters · ~10.5 expected11%
Reproduction · 3 chapters · ~9.7 expected11%
Biotechnology · 3 chapters · ~8.5 expected10%
Structural Organization · 3 chapters · ~7.9 expected9%
Ecology and Environment · 3 chapters · ~7.7 expected8%
Plant Physiology · 3 chapters · ~6.9 expected7%

Trend

Rising and falling chapters

Change in questions per paper: 2024–2026 against 2017–2023, on a 180-question paper.

Rising

Human Health and Disease+2.32.5 → 4.8 per paper · slope +0.24 a year
Cell: The Unit of Life+2.02.9 → 4.9 per paper · slope +0.22 a year
Chemical Coordination and Integration+1.81.8 → 3.6 per paper · slope +0.17 a year
Human Reproduction+1.52.7 → 4.2 per paper · slope +0.22 a year
Photosynthesis in Higher Plants+1.51.8 → 3.2 per paper · slope +0.31 a year
Evolution+1.22.4 → 3.5 per paper · slope +0.12 a year
Biomolecules+1.02.8 → 3.8 per paper · slope +0.22 a year
Structural Organisation in Animals+0.92.3 → 3.2 per paper · slope +0.24 a year

Falling

Anatomy of Flowering Plants−1.62.9 → 1.2 per paper · slope -0.29 a year
Cell Cycle and Cell Division−1.23.4 → 2.2 per paper · slope +0.03 a year
Breathing and Exchange of Gases−1.01.9 → 0.9 per paper · slope -0.17 a year
Molecular Basis of Inheritance−1.06.1 → 5.1 per paper · slope -0.08 a year
Biotechnology and its Applications−1.02.6 → 1.6 per paper · slope -0.09 a year
Neural Control and Coordination−0.71.7 → 0.9 per paper · slope -0.22 a year
Reproductive Health−0.72.3 → 1.6 per paper · slope -0.09 a year
Plant Kingdom−0.53.1 → 2.6 per paper · slope -0.07 a year

Shape of the questions

How Biology questions have changed

Class balance, difficulty and figure use in each year's paper. Tap a year to open that paper.

Class 11 and Class 12

0%25%50%75%100%

2017
4941
2018
4842
2019
4545
2020
4743
2021
5248
2022
5347
2023
5545
2024
5248
2025
4248
2026
3951

Class 11
Class 12

Difficulty

0%25%50%75%100%

2017
5238
2018
6327
2019
5435
2020
5733
2021
6929
2022
5742
2023
5741
2024
5545
2025
5138
2026
5830

Easy
Medium
Hard

Question pattern

0%25%50%75%100%

20177120
20187612
20196713
2020641317
2021591817
2022472211
202348101811
202430163010
2025441212
20265810

Recall
Concept
Application
Calculation
Figure-based
Match the lists
Two statements
Assertion–reason

Need a calculation

2%’17 0%’18 3%’19 1%’20 2%’21 6%’22 1%’23 2%’24 4%’25 8%’26

Use a figure

0%’17 0%’18 0%’19 0%’20 1%’21 1%’22 1%’23 7%’24 4%’25 0%’26

Botany and Zoology

The two halves of Biology

NEET prints Biology as two sections. Which section each chapter's questions sat in, and how the split moved by year.

Questions by section, by year

0%25%50%75%100%

2017
5733
2018
5535
2019
5337
2020
5040
2021
5050
2022
5050
2023
5050
2024
5050
2025
5535
2026
5040

Botany
Zoology

By chapter, ten years

Molecular Basis of InheritanceBotany 47 · Zoology 14
4714
Biotechnology: Principles and ProcessesBotany 13 · Zoology 33
1333
Principles of Inheritance and VariationBotany 36 · Zoology 7
367
Sexual Reproduction in Flowering PlantsBotany 37 · Zoology 0
37
Cell: The Unit of LifeBotany 30 · Zoology 6
306
Animal KingdomBotany 0 · Zoology 34
34
Human ReproductionBotany 1 · Zoology 32
32
Human Health and DiseaseBotany 1 · Zoology 32
32
BiomoleculesBotany 25 · Zoology 8
258
Cell Cycle and Cell DivisionBotany 23 · Zoology 9
239
Organisms and PopulationsBotany 25 · Zoology 6
256
Plant KingdomBotany 31 · Zoology 0
31
EvolutionBotany 3 · Zoology 25
25
Morphology of Flowering PlantsBotany 28 · Zoology 0
28
Structural Organisation in AnimalsBotany 0 · Zoology 27
27
Biological ClassificationBotany 21 · Zoology 5
215
Anatomy of Flowering PlantsBotany 25 · Zoology 0
25
Chemical Coordination and IntegrationBotany 0 · Zoology 24
24
Biotechnology and its ApplicationsBotany 6 · Zoology 18
618
Photosynthesis in Higher PlantsBotany 23 · Zoology 0
23
Plant Growth and DevelopmentBotany 23 · Zoology 0
23
Biodiversity and ConservationBotany 21 · Zoology 1
21
Reproductive HealthBotany 0 · Zoology 22
22
Body Fluids and CirculationBotany 0 · Zoology 21
21
EcosystemBotany 19 · Zoology 1
19
Locomotion and MovementBotany 0 · Zoology 19
19
Breathing and Exchange of GasesBotany 0 · Zoology 17
17
Microbes in Human WelfareBotany 14 · Zoology 2
142
Excretory Products and their EliminationBotany 0 · Zoology 16
16
Respiration in PlantsBotany 15 · Zoology 0
15
Neural Control and CoordinationBotany 0 · Zoology 15
15
The Living WorldBotany 6 · Zoology 3
63

Topics

Biology topics asked most

The 20 topics with the most questions in ten years. A filled dot is a year the topic was asked.

Biomolecule Structure33
Biomolecules
Plant Tissues and Anatomy25
Anatomy of Flowering Plants
Endocrine Glands and Hormone Action24
Chemical Coordination and Integration
Restriction Enzymes22
Biotechnology: Principles and Processes
Mitotic Division21
Cell Cycle and Cell Division
Mendelian Inheritance20
Principles of Inheritance and Variation
Flower Structure19
Morphology of Flowering Plants
Cloning Vectors18
Biotechnology: Principles and Processes
Animal Kingdom: Basis of Classification and Non-chordates18
Animal Kingdom
Immunity and Lymphoid Organs17
Human Health and Disease
Human Diseases, Cancer and Drug Abuse16
Human Health and Disease
Chordate Classes16
Animal Kingdom
Population Interactions16
Organisms and Populations
Microbes in Human Welfare16
Microbes in Human Welfare
DNA Double Helix16
Molecular Basis of Inheritance
Energy Flow in Ecosystem15
Ecosystem
Plant Growth Regulators15
Plant Growth and Development
Transcription Process15
Molecular Basis of Inheritance
Pollination Mechanisms15
Sexual Reproduction in Flowering Plants
Sex Determination and Genetic Disorders15
Principles of Inheritance and Variation

Topic	Chapter	Total	Per paper	Weighted est.
Biomolecule Structure	Biomolecules	33	3.1	3.4
Plant Tissues and Anatomy	Anatomy of Flowering Plants	25	2.4	1.8
Endocrine Glands and Hormone Action	Chemical Coordination and Integration	24	2.3	2.7
Restriction Enzymes	Biotechnology: Principles and Processes	22	2.1	1.9
Mitotic Division	Cell Cycle and Cell Division	21	2.0	1.8
Mendelian Inheritance	Principles of Inheritance and Variation	20	1.9	1.8
Flower Structure	Morphology of Flowering Plants	19	1.8	2.3
Cloning Vectors	Biotechnology: Principles and Processes	18	1.7	2.1
Animal Kingdom: Basis of Classification and Non-chordates	Animal Kingdom	18	1.7	1.8
Immunity and Lymphoid Organs	Human Health and Disease	17	1.6	1.9
Human Diseases, Cancer and Drug Abuse	Human Health and Disease	16	1.5	1.8
Chordate Classes	Animal Kingdom	16	1.5	1.7
Population Interactions	Organisms and Populations	16	1.5	1.7
Microbes in Human Welfare	Microbes in Human Welfare	16	1.6	1.4
DNA Double Helix	Molecular Basis of Inheritance	16	1.5	1.4
Energy Flow in Ecosystem	Ecosystem	15	1.4	1.8
Plant Growth Regulators	Plant Growth and Development	15	1.4	1.7
Transcription Process	Molecular Basis of Inheritance	15	1.4	1.5
Pollination Mechanisms	Sexual Reproduction in Flowering Plants	15	1.4	1.4
Sex Determination and Genetic Disorders	Principles of Inheritance and Variation	15	1.4	1.3

Papers

Biology in each NEET paper

What does “share” mean?

A chapter's average share of the whole NEET paper over ten years. Years with 200 printed questions are scaled to 180 so they compare fairly.

Is the weighted estimate a prediction?

No. It is a weighted average of the chapter's recent share, scaled to a 180-question paper. It shows where past papers put their weight, not what the next paper will ask.