ISC Class 11 Science Chapter Weightage 2026-27
Subject-wise Marks Distribution & Important Topics
Understand the chapter-wise weightage for ISC Class 11 Science exams. Focus on high-weightage topics to maximize your scores. Your complete guide to ISC Class 11 Science chapter weightage.
4 Core Subjects
70+30/80+20 Pattern
High Weightage Topics
Updated for 2026-27
ISC Class 11 Physics Chapter Weightage
| Unit / Chapter | Weightage (%) | Marks (Out of 70) | Importance |
|---|---|---|---|
| Physical World and Measurement | 5% | 3.5 | Medium |
| Mechanics | 30% | 21 | Critical |
| Thermal Physics | 15% | 10.5 | High |
| Waves and Oscillations | 15% | 10.5 | High |
| Optics | 15% | 10.5 | High |
| Electricity and Magnetism | 20% | 14 | Critical |
| Modern Physics | 10% | 7 | High |
Key Topics: Mechanics (30%), Electricity and Magnetism (20%), Optics (15%), Thermal Physics (15%), Waves (15%)
ISC Class 11 Chemistry Chapter Weightage
Physical Chemistry
| Chapter | Weightage (%) | Marks |
|---|---|---|
| Some Basic Concepts | 10% | 7 |
| Structure of Atom | 10% | 7 |
| Chemical Bonding | 10% | 7 |
| Thermodynamics | 10% | 7 |
| Equilibrium | 5% | 3.5 |
Inorganic Chemistry
| Chapter | Weightage (%) | Marks |
|---|---|---|
| Classification of Elements | 10% | 7 |
| s-Block Elements | 10% | 7 |
| p-Block Elements | 10% | 7 |
Organic Chemistry
| Chapter | Weightage (%) | Marks |
|---|---|---|
| Basic Principles | 10% | 7 |
| Hydrocarbons | 15% | 10.5 |
| Functional Groups | 5% | 3.5 |
ISC Class 11 Mathematics Chapter Weightage
| Unit / Chapter | Weightage (%) | Marks (Out of 80) | Importance |
|---|---|---|---|
| Sets and Functions | 15% | 12 | High |
| Algebra | 30% | 24 | Critical |
| Calculus | 35% | 28 | Critical |
| Vectors and 3D Geometry | 15% | 12 | High |
| Statistics and Probability | 5% | 4 | Medium |
Key Topics: Calculus (35%), Algebra (30%), Sets and Functions (15%), Vectors and 3D Geometry (15%)
ISC Class 11 Biology Chapter Weightage
| Unit / Chapter | Weightage (%) | Marks (Out of 70) | Importance |
|---|---|---|---|
| Plant Kingdom | 10% | 7 | Critical |
| Plant Morphology & Anatomy | 10% | 7 | High |
| Plant Physiology | 20% | 14 | Critical |
| Animal Kingdom | 10% | 7 | Critical |
| Animal Morphology & Anatomy | 10% | 7 | High |
| Animal Physiology | 20% | 14 | Critical |
| Genetics and Evolution | 15% | 10.5 | High |
| Ecology | 5% | 3.5 | Medium |
Key Topics: Plant Physiology (20%), Animal Physiology (20%), Genetics and Evolution (15%), Plant Kingdom (10%), Animal Kingdom (10%)
Quick Reference: Subject-wise Weightage
| Subject | High Weightage Topics | Approx. Marks |
|---|---|---|
| Physics | Mechanics (30%), Electricity & Magnetism (20%), Optics (15%), Thermal Physics (15%) | 56/70 |
| Chemistry | Organic Chemistry (15%), Physical Chemistry (10-10%), Inorganic Chemistry (10-10%) | 49/70 |
| Mathematics | Calculus (35%), Algebra (30%), Sets and Functions (15%), Vectors (15%) | 68/80 |
| Biology | Plant Physiology (20%), Animal Physiology (20%), Genetics & Evolution (15%) | 42/70 |
Final Tip: Prioritize high-weightage chapters first. Master them thoroughly before moving to other chapters. This strategy will help you score well in both board exams and competitive exams.
Frequently Asked Questions
Chapter weightage helps you prioritize your study time. Focus more on high-weightage chapters to maximize your scores in exams.
The weightage pattern is set by CISCE and is generally consistent across all ISC schools. However, minor variations may exist. Always check with your school for the exact distribution.
StudyDecode provides comprehensive guidance for ISC Class 11 Science students. We help you understand chapter weightage, plan your studies, and prepare effectively for exams. Book a free consultation to know more.
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