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In the NEET exam, Biology is the highest-weightage and most score-deciding subject, contributing 50% of the total marks. While all chapters are included in the syllabus, NEET toppers do not prepare every Biology chapter with equal focus. Instead, they carefully analyze the NEET chapter-wise weightage from the last 5–10 years to identify chapters that are asked repeatedly and carry higher importance.
This strategic approach helps students concentrate on high-yield NCERT-based topics, improve accuracy, reduce silly mistakes, and maximize overall scores. Based on this strategy, below is the NEET Biology chapter-wise weightage analysis from 2021 to 2025, highlighting the most important chapters to prioritize for effective and high-scoring NEET preparation.
| Subject | Resources |
| NEET Physics Chapter-Wise Weightage | Download PDF |
| NEET Chemistry Chapter-Wise Weightage | Download PDF |
Here is the NEET Biology chapter-wise weightage based on the last 5 years (2021–2025). This analysis allows students to identify high-scoring and frequently asked Biology chapters, enabling focused preparation and better time management.
| Biology Chapter | NEET Biology 5 Years Questions | NEET Biology 5 Years Weightage % | 2025 Questions | Weightage % | 2024 Questions | Weightage % | 2023 Questions | Weightage % | 2022 Questions | Weightage % | 2021 Questions | Weightage % |
| The Living World | 8 | 8.88% | 0 | 0.00% | 1 | 1.11% | 3 | 3.33% | 2 | 2.22% | 2 | 2.22% |
| Biological Classification | 12 | 13.32% | 1 | 1.11% | 2 | 2.22% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Plant Kingdom | 20 | 22.21% | 5 | 5.56% | 4 | 4.44% | 3 | 3.33% | 4 | 4.44% | 4 | 4.44% |
| Animal Kingdom | 16 | 17.76% | 4 | 4.44% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Morphology of Flowering Plants | 14 | 15.54% | 3 | 3.33% | 2 | 2.22% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Anatomy of Flowering Plants | 9 | 9.99% | 1 | 1.11% | 1 | 1.11% | 3 | 3.33% | 2 | 2.22% | 2 | 2.22% |
| Structural Organisation in Animals | 16 | 17.76% | 4 | 4.44% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Cell The Unit of Life | 20 | 22.21% | 5 | 5.56% | 4 | 4.44% | 3 | 3.33% | 4 | 4.44% | 4 | 4.44% |
| Biomolecules | 16 | 17.76% | 4 | 4.44% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Cell Cycle and Cell Division | 10 | 11.10% | 1 | 1.11% | 2 | 2.22% | 3 | 3.33% | 2 | 2.22% | 2 | 2.22% |
| Transport in Plants | 7 | 7.77% | 0 | 0.00% | 1 | 1.11% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% |
| Mineral Nutrition | 4 | 4.44% | 0 | 0.00% | 1 | 1.11% | 1 | 1.11% | 1 | 1.11% | 1 | 1.11% |
| Photosynthesis in Higher Plants | 10 | 11.10% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% |
| Respiration in Plants | 5 | 5.55% | 1 | 1.11% | 1 | 1.11% | 1 | 1.11% | 1 | 1.11% | 1 | 1.11% |
| Plant Growth and Development | 8 | 8.88% | 2 | 2.22% | 1 | 1.11% | 1 | 1.11% | 2 | 2.22% | 2 | 2.22% |
| Digestion and Absorption | 11 | 12.21% | 0 | 0.00% | 2 | 2.22% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Breathing and Exchange of Gases | 12 | 13.32% | 1 | 1.11% | 2 | 2.22% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Body Fluids and Circulation | 11 | 12.21% | 1 | 1.11% | 1 | 1.11% | 3 | 3.33% | 3 | 3.33% | 3 | 3.33% |
| Excretory Products and Their Elimination | 8 | 8.88% | 1 | 1.11% | 1 | 1.11% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% |
| Locomotion and Movement | 8 | 8.88% | 1 | 1.11% | 1 | 1.11% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% |
| Neural Control and Coordination | 8 | 8.88% | 0 | 0.00% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% | 2 | 2.22% |
This chapter-wise difficulty analysis of NEET Biology is based on the last five years of exam trends. It helps students identify high-scoring and time-saving chapters, prioritize NCERT-focused topics, and maximize accuracy in the highest-weightage subject of NEET.
| Biology Chapter | NEET Biology 5 Years Questions | NEET Biology 5 Years Weightage % |
| The Living World | 8 | 8.88% |
| Biological Classification | 12 | 13.32% |
| Anatomy of Flowering Plants | 9 | 9.99% |
| Biomolecules | 16 | 17.76% |
| Transport in Plants | 7 | 7.77% |
| Mineral Nutrition | 4 | 4.44% |
| Respiration in Plants | 5 | 5.55% |
| Plant Growth & Development | 8 | 8.88% |
| Excretory Products & Elimination | 8 | 8.88% |
| Locomotion & Movement | 8 | 8.88% |
| Biology Chapter | NEET Biology 5 Years Questions | NEET Biology 5 Years Weightage % |
| Plant Kingdom | 20 | 22.21% |
| Animal Kingdom | 16 | 17.76% |
| Morphology of Flowering Plants | 14 | 15.54% |
| Structural Organisation in Animals | 16 | 17.76% |
| Cell – The Unit of Life | 20 | 22.21% |
| Cell Cycle & Cell Division | 10 | 11.10% |
| Photosynthesis in Higher Plants | 10 | 11.10% |
| Digestion & Absorption | 11 | 12.21% |
| Breathing & Exchange of Gases | 12 | 13.32% |
| Body Fluids & Circulation | 11 | 12.21% |
| Neural Control & Coordination | 8 | 8.88% |
Biology carries the highest weightage in NEET, but even here, all chapters are not tested equally. Chapter-wise weightage helps students maximize scores with focused NCERT-based preparation.
1. Strategic Prioritization: Weightage analysis highlights high-yield Biology chapters like Cell Biology, Plant Kingdom, Animal Kingdom, Biomolecules, and Human Physiology.
2. Optimal Time Management: Students can focus more on frequently asked NCERT chapters and avoid over-investing time in low-weightage topics.
3. Boosted Scoring Potential: High-weightage Biology chapters appear consistently. Mastering them helps students aim for 300+ marks with high accuracy.
4. Confidence & Reduced Anxiety: Completing the most important Biology chapters first builds confidence and makes final revisions faster and stress-free.
5. Smarter Revision Strategy: Weightage-based Biology revision ensures repeated reading of NCERT lines, diagrams, and tables that directly convert into marks.
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1. Why is Biology the most important subject in NEET?
Biology carries 90 questions (360 marks), making it 50% of NEET. High accuracy in Biology directly boosts rank and overall NEET score.
2. Is NEET Biology fully based on NCERT?
Yes. Almost all NEET Biology questions are directly or indirectly from NCERT Class 11 and 12 textbooks, including diagrams, tables, and terminology.
3. Which Biology chapters have the highest weightage in NEET?
Plant Kingdom, Cell – The Unit of Life, Animal Kingdom, Biomolecules, and Human Physiology chapters consistently carry the highest weightage.
4. How reliable is the 5-year chapter-wise weightage analysis?
Very reliable. NEET follows a consistent question pattern, and analyzing the last 5 years helps identify repeatedly asked, high-probability chapters.
5. Are easy Biology chapters enough to score 300+ marks?
No. Easy chapters build confidence, but scoring 300+ requires mastering high-weightage medium chapters like Cell Biology, Plant Kingdom, and Physiology.
6. Which Biology chapters should be studied first for NEET?
Start with high-weightage NCERT-based chapters like Cell Biology, Biomolecules, Plant Kingdom, Animal Kingdom, and Human Physiology.
7. Is Biology easier than Physics and Chemistry in NEET?
Yes. Biology is more factual and NCERT-driven, making it easier to score with proper reading, revision, and repeated PYQ practice.
8. How does difficulty-level analysis help NEET Biology preparation?
It helps students prioritize chapters smartly—cover easy chapters quickly, focus deeply on medium ones, and avoid spending excess time on low-yield topics.
9. How many times should NCERT Biology be revised for NEET?
At least 3–4 full revisions are essential. Toppers often revise NCERT Biology multiple times, especially diagrams, examples, and highlighted lines.
10. Can strong Biology performance compensate for weak Physics?
Yes. High Biology accuracy can significantly boost total score and rank, especially when Physics is comparatively tougher for many students.
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