NEET 2027 Biology carries 360 marks across 90 questions and chapters like Molecular Basis of Inheritance and Human Health and Disease consistently account for 30–40 marks based on previous year trends.
Biology contributes 50% of the total NEET score, making it the most critical subject for your rank. With 45 questions each from Botany and Zoology spanning Class 11 and Class 12, a chapter-wise strategy built on previous year data from 2019 to 2025 can significantly boost your score.
- Total Biology marks in NEET 2027: 360 (90 questions × 4 marks each, with –1 for wrong answers)
- Molecular Basis of Inheritance is the single highest-weightage chapter with 5–7 questions annually.
- Class 12 chapters carry higher overall weightage than Class 11, contributing 55–60% of Biology questions.
- Genetics chapters combined (Molecular Basis of Inheritance + Principles of Inheritance and Variation) can yield 9–13 questions per paper.
- Human Physiology (Zoology) chapters collectively contribute 18–22 questions each year.
| Direct Link: NEET 2027 Official Website | neet.nta.nic.in |
NEET 2027 Biology Exam Pattern
The Biology section in NEET 2027 follows the NTA two-section format introduced in 2024. Understanding this structure helps you plan how many questions to attempt from each chapter.
| Parameter | Details |
|---|---|
| Total Questions (Biology) | 100 (Section A: 35 + Section B: 15 per subject) |
| Questions to Attempt | 90 (35 from Section A + 10 out of 15 from Section B per subject) |
| Marking Scheme | +4 for correct, –1 for incorrect |
| Maximum Marks (Biology) | 360 |
| Subjects | Botany (Class 11 + 12) and Zoology (Class 11 + 12) |
Targeting 80+ correct answers in Biology (320+ marks) places you in a strong position for government medical college admission, based on previous year NEET cutoff analysis.
Class 11 Biology Chapter-Wise Weightage
Class 11 chapters contribute approximately 40–45% of Biology questions in NEET. The figures below reflect average questions per chapter based on NEET papers from 2019 to 2025.
| Chapter | Subject | Average Questions (2019–2025) | Expected Marks |
|---|---|---|---|
| Animal Kingdom | Zoology | 3–5 | 12–20 |
| Neural Control and Coordination | Zoology | 3–4 | 12–16 |
| Chemical Coordination and Integration | Zoology | 3–4 | 12–16 |
| Excretory Products and their Elimination | Zoology | 3–4 | 12–16 |
| Body Fluids and Circulation | Zoology | 3–4 | 12–16 |
| Photosynthesis in Higher Plants | Botany | 3–4 | 12–16 |
| Cell: The Unit of Life | Botany | 3–4 | 12–16 |
| Morphology of Flowering Plants | Botany | 3–4 | 12–16 |
| Plant Kingdom | Botany | 3–4 | 12–16 |
| Digestion and Absorption | Zoology | 2–3 | 8–12 |
| Breathing and Exchange of Gases | Zoology | 2–3 | 8–12 |
| Biomolecules | Botany | 2–3 | 8–12 |
| Cell Cycle and Cell Division | Botany | 2–3 | 8–12 |
| Anatomy of Flowering Plants | Botany | 2–3 | 8–12 |
| Structural Organisation in Animals | Zoology | 2–3 | 8–12 |
| Biological Classification | Botany | 2–3 | 8–12 |
| Locomotion and Movement | Zoology | 2–3 | 8–12 |
| Respiration in Plants | Botany | 2–3 | 8–12 |
| Transport in Plants | Botany | 1–2 | 4–8 |
| Mineral Nutrition | Botany | 1–2 | 4–8 |
| Plant Growth and Development | Botany | 1–2 | 4–8 |
| The Living World | Botany | 1–2 | 4–8 |
Animal Kingdom, Neural Control and Coordination, and Photosynthesis in Higher Plants are the top-priority Class 11 chapters based on consistent previous year question frequency.
Class 12 Biology Chapter-Wise Weightage
Class 12 Biology dominates the NEET paper, contributing 55–60% of Biology questions. Genetics chapters alone — Molecular Basis of Inheritance and Principles of Inheritance and Variation — can contribute 9–13 questions, making them a combined scoring powerhouse.
| Chapter | Subject | Average Questions (2019–2025) | Expected Marks |
|---|---|---|---|
| Molecular Basis of Inheritance | Botany/Zoology | 5–7 | 20–28 |
| Principles of Inheritance and Variation | Botany/Zoology | 4–6 | 16–24 |
| Human Health and Disease | Zoology | 4–5 | 16–20 |
| Sexual Reproduction in Flowering Plants | Botany | 3–5 | 12–20 |
| Human Reproduction | Zoology | 3–4 | 12–16 |
| Biotechnology: Principles and Processes | Botany/Zoology | 3–4 | 12–16 |
| Organisms and Populations | Botany/Zoology | 2–3 | 8–12 |
| Ecosystem | Botany/Zoology | 2–3 | 8–12 |
| Evolution | Zoology | 2–3 | 8–12 |
| Reproductive Health | Zoology | 2–3 | 8–12 |
| Biotechnology and its Applications | Botany/Zoology | 2–3 | 8–12 |
| Reproduction in Organisms | Botany/Zoology | 1–2 | 4–8 |
| Microbes in Human Welfare | Botany | 1–2 | 4–8 |
| Strategies for Enhancement in Food Production | Botany | 1–2 | 4–8 |
| Biodiversity and Conservation | Botany | 1–2 | 4–8 |
| Environmental Issues | Botany | 1–2 | 4–8 |
Chapters like Environmental Issues, Biodiversity and Conservation, and Microbes in Human Welfare carry low weightage but are quick to revise through NCERT highlights — do not skip them entirely.
Most Important Chapters for NEET 2027 Biology
These 10 chapters are your highest-return investment for NEET 2027 Biology. Based on 2019–2025 trends, these chapters together account for approximately 55–65% of the Biology score.
| Priority | Chapter | Class | Average Questions | Why It Matters |
|---|---|---|---|---|
| 1 | Molecular Basis of Inheritance | 12 | 5–7 | Highest single-chapter weightage; predictable question types |
| 2 | Principles of Inheritance and Variation | 12 | 4–6 | Genetics problems test Mendel, codominance, sex-linkage |
| 3 | Human Health and Disease | 12 | 4–5 | Factual recall; high scoring with targeted NCERT reading |
| 4 | Animal Kingdom | 11 | 3–5 | Phylum-level classification; visual mnemonics help retention |
| 5 | Sexual Reproduction in Flowering Plants | 12 | 3–5 | Diagram-heavy; structure and process questions |
| 6 | Neural Control and Coordination | 11 | 3–4 | Neuron structure, synapse, reflex arc tested annually |
| 7 | Chemical Coordination and Integration | 11 | 3–4 | Hormone functions and target organs; factual scoring |
| 8 | Excretory Products and their Elimination | 11 | 3–4 | Nephron diagram and urine formation tested consistently |
| 9 | Biotechnology: Principles and Processes | 12 | 3–4 | rDNA, PCR, gel electrophoresis appear frequently |
| 10 | Photosynthesis in Higher Plants | 11 | 3–4 | Calvin cycle and light reactions — cycle diagrams are essential |
If you have 90 days or fewer before NEET 2027, spend at least 40% of your Biology study time on these 10 chapters before covering medium and low-weightage topics.
Botany vs Zoology: Marks Distribution
NEET Biology splits equally between Botany and Zoology at 45 questions each. But their difficulty and scoring patterns differ. Zoology Class 12 chapters are more factual and yield easier marks for students who read NCERT carefully.
| Subject | Questions | Max Marks | Top Scoring Chapters |
|---|---|---|---|
| Botany – Class 11 | ~22 | ~88 | Plant Kingdom, Morphology, Cell Biology, Photosynthesis |
| Botany – Class 12 | ~23 | ~92 | Molecular Basis of Inheritance, Sexual Reproduction, Biotechnology |
| Zoology – Class 11 | ~22 | ~88 | Animal Kingdom, Neural Control, Excretion, Circulation |
| Zoology – Class 12 | ~23 | ~92 | Human Reproduction, Human Health and Disease, Evolution |
Prepare Genetics as one combined unit — Molecular Basis of Inheritance and Principles of Inheritance and Variation share overlapping concepts (DNA replication, transcription, translation, Mendelian genetics) and together represent the single biggest scoring opportunity in NEET Biology with 9–13 questions annually based on previous year trends.
NEET 2027 Biology Chapter-Wise Weightage FAQs
Ques. Which chapter has the highest weightage in NEET Biology?
Ans. Molecular Basis of Inheritance has the highest weightage in NEET Biology, contributing 5–7 questions (20–28 marks) annually based on previous year trends from 2019 to 2025. Principles of Inheritance and Variation is close behind with 4–6 questions per year.
Ques. How many questions come from Class 12 Biology in NEET?
Ans. Based on previous year trends, approximately 50–55 out of 90 Biology questions come from Class 12 chapters. This makes Class 12 Biology the higher-priority section compared to Class 11.
Ques. Is Botany or Zoology easier for NEET students?
Ans. Most students find Class 12 Zoology chapters easier to score in because topics like Human Health and Disease, Human Reproduction, and Reproductive Health are factual and directly covered by NCERT. Botany chapters like Photosynthesis in Higher Plants and Plant Kingdom require deeper conceptual understanding.
Ques. What Biology score is needed for a government medical college in NEET 2027?
Ans. Targeting 300+ marks in Biology (out of 360) puts you in a strong position for government medical college admission. This translates to approximately 80+ correct answers. Students scoring 600+ overall with strong Biology marks qualify for top government medical colleges under the general category based on previous year cutoff trends.
Ques. Which Class 11 Biology chapters are most important for NEET 2027?
Ans. Animal Kingdom (3–5 questions), Neural Control and Coordination (3–4 questions), Chemical Coordination and Integration (3–4 questions), and Photosynthesis in Higher Plants (3–4 questions) are the most important Class 11 Biology chapters for NEET 2027 based on previous year trends.
Ques. Can I skip low-weightage Biology chapters for NEET 2027?
Ans. Skipping low-weightage chapters entirely is not recommended. Chapters like Environmental Issues, Biodiversity and Conservation, and Microbes in Human Welfare each contribute 1–2 questions. A quick NCERT revision of these chapters takes only a few hours and can secure 4–8 additional marks — which can shift your rank meaningfully.
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