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NEET UG · subject

NEET Biology preparation: the 90 questions that decide your rank

BrainStride Exam DeskReviewed by BrainStride Biology facultyUpdated September 2026 · 9 min read

Biology is 90 of the 180 questions in NEET UG and 360 of the 720 marks — half the paper, split by NTA into Botany and Zoology sections of 45 questions each. Ranks are decided here: at the top of the list, students are separated by two or three Biology questions, almost all of them answerable from an NCERT line. BrainStride is an AI tutor for JEE, NEET and Olympiad preparation that runs a 20-minute diagnostic, maps your weak chapters and writes a daily plan, with every solution checked by teachers.

Quick answer

  • NEET Biology is 90 of the 180 questions and 360 of the 720 marks, marked +4 for a correct answer and −1 for a wrong one.
  • The syllabus runs to 32 NCERT chapters across 10 official units, of which 17 are usually taught as Botany and 15 as Zoology.
  • Genetics and Evolution (10–14 Q), Human Physiology (8–12 Q) and Ecology (6–9 Q) are the heaviest units in recent papers.
  • Almost every question traces to an NCERT line, table or diagram — which is why accuracy, not extra material, is what moves a Biology score.
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All ten Biology units by weightage

Question counts are BrainStride’s analysis of recent NEET papers, not official figures — NTA publishes no chapter weightage. Average questions per paper across the Botany and Zoology sections.

  • Diversity in Living World8–10 Q
  • Structural Organisation in Animals and Plants5–7 Q
  • Cell Structure and Function8–10 Q
  • Plant Physiology6–8 Q
  • Human Physiology8–12 Q
  • Reproduction8–10 Q
  • Genetics and Evolution10–14 Q
  • Biology and Human Welfare4–6 Q
  • Biotechnology and its Applications5–7 Q
  • Ecology and Environment6–9 Q

What each Biology unit is worth, and how it is tested

The ten units of the official NEET Biology syllabus. Unit totals are the ranges we publish on the NEET hub page; the chapter table below breaks them down.

UnitChaptersTypical questionsHow it is tested
Diversity in Living World48–10 QRecall, example-driven
Structural Organisation in Animals and Plants35–7 QDiagram recall
Cell Structure and Function38–10 QRecall + reasoning
Plant Physiology36–8 QProcess recall
Human Physiology68–12 QRecall + application
Reproduction38–10 QSequence and diagram recall
Genetics and Evolution310–14 QReasoning + numericals
Biology and Human Welfare24–6 QRecall
Biotechnology and its Applications25–7 QProcess recall
Ecology and Environment36–9 QRecall, quick marks

Ranges overlap and are rounded, so chapter ranges do not add up exactly to a unit or subject total. Counts shift by a question or two every year.

Every NEET Biology chapter, unit by unit

All 32 NCERT chapters in the NEET Biology syllabus, in the order the units appear in the official syllabus. Chapter names match the syllabus tracker, so you can tick them off as you finish them.

ChapterUnitClassSectionTypical questionsThe mistake it catches
1. The Living WorldDiversity in Living World11Botany1–2 QLearning the taxonomic hierarchy without the examples it is tested with.
2. Biological ClassificationDiversity in Living World11Botany2–3 QMixing five-kingdom criteria with the three-domain system.
3. Plant KingdomDiversity in Living World11Botany2–3 QConfusing haplontic, diplontic and haplo-diplontic life cycles.
4. Animal KingdomDiversity in Living World11Zoology2–3 QPlacing a phylum by habitat instead of the diagnostic feature.
5. Morphology of Flowering PlantsStructural Organisation in Animals and Plants11Botany2–3 QReading a floral formula without aestivation and placentation.
6. Anatomy of Flowering PlantsStructural Organisation in Animals and Plants11Botany2–3 QSwapping dicot and monocot vascular bundle features.
7. Structural Organisation in AnimalsStructural Organisation in Animals and Plants11Zoology1–2 QLearning frog anatomy without the labels NCERT uses.
8. Cell: The Unit of LifeCell Structure and Function11Botany3–4 QQuoting organelle functions but missing the exceptions NCERT states.
9. BiomoleculesCell Structure and Function11Zoology2–3 QConfusing enzyme classes with their examples.
10. Cell Cycle and Cell DivisionCell Structure and Function11Botany2–3 QPutting chromosome number and DNA content at the wrong meiotic stage.
11. Photosynthesis in Higher PlantsPlant Physiology11Botany2–3 QMixing C3 and C4 leaf anatomy with their biochemical steps.
12. Respiration in PlantsPlant Physiology11Botany2–3 QCounting ATP without the assumptions NCERT states.
13. Plant Growth and DevelopmentPlant Physiology11Botany2–3 QMatching a growth regulator to the wrong classic experiment.
14. Breathing and Exchange of GasesHuman Physiology11Zoology1–2 QMis-stating lung volumes and capacities by definition.
15. Body Fluids and CirculationHuman Physiology11Zoology2–3 QConfusing cardiac cycle phases with the ECG waves.
16. Excretory Products and their EliminationHuman Physiology11Zoology1–2 QPlacing reabsorption in the wrong part of the nephron.
17. Locomotion and MovementHuman Physiology11Zoology1–2 QDescribing sliding filament theory without what happens to each band.
18. Neural Control and CoordinationHuman Physiology11Zoology1–2 QReversing the ion movements in resting and action potentials.
19. Chemical Coordination and IntegrationHuman Physiology11Zoology2–3 QMatching a hormone to the wrong gland or the wrong disorder.
20. Sexual Reproduction in Flowering PlantsReproduction12Botany3–4 QLosing track of ploidy at each stage of the embryo sac.
21. Human ReproductionReproduction12Zoology3–4 QMis-timing events in gametogenesis and the menstrual cycle.
22. Reproductive HealthReproduction12Zoology2–3 QLearning contraceptive categories without NCERT’s examples.
23. Principles of Inheritance and VariationGenetics and Evolution12Botany4–5 QApplying a plain 9:3:3:1 where linkage or incomplete dominance changes it.
24. Molecular Basis of InheritanceGenetics and Evolution12Botany4–6 QBlurring prokaryotic and eukaryotic transcription, or the lac operon states.
25. EvolutionGenetics and Evolution12Zoology2–4 QUsing Hardy–Weinberg without checking its assumptions.
26. Human Health and DiseaseBiology and Human Welfare12Zoology3–4 QMatching a disease to the wrong pathogen or vector.
27. Microbes in Human WelfareBiology and Human Welfare12Botany1–2 QLearning microbe names without the product each one makes.
28. Biotechnology: Principles and ProcessesBiotechnology and its Applications12Zoology3–4 QMixing up the order in which restriction enzymes, vectors and ligase are used.
29. Biotechnology and its ApplicationsBiotechnology and its Applications12Zoology2–3 QConfusing Bt cry genes with the RNA interference examples.
30. Organisms and PopulationsEcology and Environment12Botany2–3 QSwapping the exponential and logistic growth equations and their symbols.
31. EcosystemEcology and Environment12Botany2–3 QInverting the pyramid of energy against those of number and biomass.
32. Biodiversity and ConservationEcology and Environment12Botany2–3 QQuoting biodiversity figures without the NCERT context they come from.

Ranges overlap and are rounded, so chapter ranges do not add up exactly to a unit or subject total. Counts shift by a question or two every year.

Is the Botany and Zoology split official?

Partly. NTA splits the Biology half of the paper into Botany and Zoology sections of 45 questions each, so the split of the paper is official. Which chapter is taught under which heading is a coaching convention: the 32 NCERT chapters are usually divided about 17 to 15, and a chapter or two moves between them depending on the material you use. The official syllabus itself is organised by unit, not by Botany and Zoology, which is how the table above orders it.

What does "NCERT line by line" actually mean?

It means the question is written from a specific sentence, table or diagram caption rather than from the idea in general. A question on the lac operon is rarely "explain regulation"; it is which state a named gene is in, in the words the textbook used.

So the useful unit of revision is the line, not the chapter. Read a page, close it, and say what the paragraph claimed — including the exceptions, which is where four-option questions are built. BrainStride maps a wrong Biology answer back to the NCERT paragraph the question came from, so revision points at a line rather than a chapter.

Where do most Biology marks leak?

Not in the hard units. They leak in recall that was never checked: a hormone matched to the wrong gland, ploidy misplaced in the embryo sac, a pyramid inverted. Each is worth −1 on top of the +4 you did not get, so ten such slips is a 50-mark swing, and in a year like 2025 — when the topper scored 686 — that is thousands of ranks. The NEET cutoff page shows how sharply marks turn into ranks near the top.

The five Biology mistakes that repeat

Patterns our subject mentors see most often — illustrative, not measured. Sample observations; replace with measured data before launch.

Reading NCERT without the tables and diagrams

Why it happens

Questions are written from captions, small tables and the exceptions printed beside them.

The fix

Treat every table and labelled diagram as examinable text: cover it, recall it, then check it.

Statement-based questions answered from a feeling

Why it happens

Two statements both sound familiar, and familiarity is not the same as knowing which one NCERT made.

The fix

Judge each statement separately as true or false before looking at the options, then match.

Similar terms never separated

Why it happens

Meiosis stages, immunity types and growth regulators are learned as clusters, not as distinctions.

The fix

Write the pairs you confuse on one sheet with the single difference that separates them, and test that sheet weekly.

Guessing across 90 questions

Why it happens

Biology feels guessable, so a dozen guesses slip in — and −1 each turns a good paper into an average one.

The fix

Rule out two options before answering. Below that, leave it blank and come back in the second pass.

Class 11 Botany left until the end

Why it happens

Plant Kingdom, Morphology and Anatomy are dry, so they get postponed past the point where revision is possible.

The fix

Finish them early and revisit them on a schedule — together they are worth more than either Biotechnology unit (5–7 Q).

Where to go after NEET Biology

Everything here is free and open — no sign-up needed for the tools.

How the Biology content here is checked

Every solution is reviewed by a subject teacher before it ships, explanations are audited weekly, and a one-tap report sends any question straight to a mentor.

Read the editorial policy
  • Reviews the NEET Biology solution bank before release
  • Audits NCERT line mapping for Botany and Zoology weekly
  • Weightage ranges come from our own reading of past papers, never from an official source that does not publish them.
  • Report anything that looks wrong and it is fixed or explained within 48 hours.

NEET Biology: common questions

How many questions come from Biology in NEET UG?

NEET UG Biology has 90 of the paper’s 180 questions and 360 of its 720 marks — half the paper — split into Botany and Zoology sections of 45 questions each. All questions are compulsory under the pattern used since 2025, with +4 for a correct answer and −1 for a wrong one. Biology is therefore where the rank is decided.

How many chapters are there in the NEET Biology syllabus?

The NEET Biology syllabus covers 32 NCERT chapters grouped into 10 official units, from Diversity in Living World to Ecology and Environment. About 17 are usually taught as Botany and 15 as Zoology, though that split is a coaching convention rather than part of the official syllabus.

Which are the most important chapters for NEET Biology?

In recent NEET papers the heaviest units are Genetics and Evolution (10–14 Q), Human Physiology (8–12 Q), Cell Structure and Function (8–10 Q) and Ecology (6–9 Q). These are BrainStride’s analysis of past papers rather than official figures — NTA publishes no chapter weightage — so use them to order your revision, not to skip units.

Is NCERT enough for NEET Biology?

For the syllabus, yes: almost every NEET Biology question traces back to an NCERT line, table or diagram. What NCERT does not give you is practice under time and negative marking, which is where scores are actually lost. Read NCERT actively, then test yourself on past-paper-style questions chapter by chapter.

How do I score above 320 in NEET Biology?

Accuracy, not extra books. Above 320 of 360 means roughly 82 of 90 questions right with almost no wrong answers, so the work is eliminating careless losses: recall checked line by line, statement questions judged one statement at a time, and guesses restricted to questions where two options are already ruled out.

Should I study Botany and Zoology separately?

Study them in the order the syllabus units run, not as two subjects — units such as Reproduction and Genetics contain both. The Botany and Zoology labels matter on exam day, because the paper has a 45-question section for each, so practise in that format closer to the exam to get used to the switch.

Official sources

Pattern and marking facts on this page follow the NEET UG pattern used since 2025. Confirm the 2027 details in the official bulletin when it is released.

Which Biology chapters are costing you the most marks?

Twenty minutes of diagnostic answers that, chapter by chapter, and points each miss back to the NCERT line behind it.

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Chapter guides for this subject

Formulas, the mistakes that cost marks, worked examples and a quiz — free, no account.