Entering Class 9 is often a bit of a wake-up call for most students. Suddenly, “Science” isn’t just one book with easy stories; it splits into the distinct worlds of Physics, Chemistry, and Biology. It’s the year where the foundation for your Class 10 boards—and even competitive exams like JEE or NEET—is truly laid. If you get your concepts right now, the next three years become a breeze. If you don’t, it feels like a constant uphill climb.
At Easy Study Notes, we’ve seen thousands of students struggle with bulky textbooks that use over-complicated language. That is exactly why we’ve curated these CBSE Class 9 Science Notes for the 2026 Exam. These aren’t just summaries; they are strictly aligned with the latest 2025-26 syllabus, designed to turn “I don’t get this” into “Oh, that’s actually simple!”
Stay tuned until the end to find the link to download the full PDF package for your revision.
CBSE Class 9 Science Syllabus & Weightage 2025-26
Before you dive into the chapters, you need a roadmap. You wouldn’t start a journey without knowing which roads are the longest, right? In Science, the “weightage” tells you where to spend most of your energy
Unit No. Unit Name Marks
Unit I Matter – Its Nature and Behaviour (Chemistry) 25
Unit II Organization in the Living World (Biology) 22
Unit III Motion, Force, and Work (Physics) 27
Unit IV Food Production 06
Total 80
Pro Tip: Pay extra attention to Unit III (Physics). At 27 marks, it’s the heavyweight champion of the syllabus. If you master the numericals here, you’re already ahead of the curve.
Unit 1: Matter – Its Nature and Behaviour (Chemistry)
Chemistry in Class 9 is all about zooming in. We stop looking at the world as “stuff” and start seeing it as particles.
Chapter 1: Matter in Our Surroundings
Think of matter as anything that takes up space. We explore the States of Matter—Solid, Liquid, and Gas—and how they change.
Evaporation: Why does a drop of water on a hot floor disappear? We explain the cooling effect of evaporation (the reason why earthen pots keep water cool).
Sublimation: Some things like camphor skip the liquid stage entirely and go from solid to gas. We break down these “magic” transitions.
Chapter 2: Is Matter Around Us Pure?
In the real world, “pure” means no chemicals. In Chemistry, “pure” means everything is made of the same particle.
Mixtures vs. Compounds: We use simple analogies to show why salt water is a mixture but pure salt is a compound.
Colloids & Tyndall Effect: Ever seen a beam of light through a dusty room? That’s the Tyndall effect. We explain why milk looks uniform but is actually a complex mixture.
Chapter 3: Atoms and Molecules
This is where it gets technical but fascinating. We cover the Laws of Chemical Combination—the rules that atoms must follow when they “hook up” to form molecules.
Valency: Think of valency as the “combining power” or the number of hands an atom has to hold onto others.
Chemical Formulae: We give you a step-by-step “criss-cross” method to write formulas like H_2O or Al_2O_3 without memorizing them.
Chapter 4: Structure of the Atom
If atoms are the building blocks, what’s inside the block?
Bohr’s Model: We visualize the atom like a mini solar system.
Isotopes and Isobars: Some atoms are like twins—same “name” (atomic number) but different “weight” (mass number). We explain why this matters in medicine and fuel.
Unit 2: Organization in the Living World (Biology)
Biology is the story of life. This year, we move from the “what” to the “how.”
Chapter 5: The Fundamental Unit of Life
The Cell is the hero here. Imagine a factory where every department has a job.
Cell Organelles: The Mitochondria is the power plant, the Nucleus is the CEO’s office, and the Lysosomes are the waste management crew.
Plant vs. Animal Cells: We provide a clear side-by-side comparison (like why plants need a rigid cell wall but you don’t).
Chapter 6: Tissues
Cells don’t work alone; they form teams called tissues.
Meristematic vs. Permanent Tissues: Think of Meristematic as “active” cells that never stop growing (like the tips of roots) and Permanent as cells that have “settled down” into a specific job.
Animal Tissues: We cover everything from the skin that protects you to the muscles that help you run.
Unit 3: Motion, Force, and Work (Physics)
Physics can be scary because of the math, but it’s actually just the logic of how things move.
Chapter 7: Motion
We move past just “fast and slow.”
Distance-Time Graphs: Learning to read these is like learning a new language.
Equations of Motion: We simplify the three big equations (v = u + at, etc.) so you know exactly which one to use for any numerical problem.
Chapter 8: Force and Laws of Motion
Newton’s Three Laws: From why you fly forward when a bus stops (Inertia) to why a gun recoils when fired.
Momentum: Why is it harder to stop a slow-moving truck than a fast-moving bicycle? It’s all in the momentum.
Chapter 9: Gravitation
Universal Law of Gravitation: Why the moon stays in orbit and why your pen falls to the floor.
Mass vs. Weight: One of the most common points of confusion—we explain why you weigh less on the moon even though your “mass” is the same.
Archimedes’ Principle: Why does a heavy iron ship float while a small needle sinks?
Chapter 10: Work and Energy
In Physics, “Work” isn’t just doing homework.
Kinetic & Potential Energy: The energy of motion vs. the energy of position (like a stretched rubber band).
Conservation of Energy: Energy can’t be created or destroyed; it just changes clothes!
Chapter 11: Sound
Sound is a vibration traveling through a medium.
Echo & Ultrasound: How bats “see” in the dark and how doctors look inside the body without surgery.
Unit 4: Food Production
Chapter 12: Improvement in Food Resources
With a growing population, we need smarter ways to grow food.
Crop Variety Improvement: How scientists create plants that can survive drought or pests.
Manures vs. Fertilizers: The classic debate between natural organic matter and lab-made chemicals.
Why These Are the Best Notes for 2026 Exams?
We didn’t just copy-paste the textbook. Our team at Easy Study Notes spent months refining this material to ensure it actually helps you learn.
Easy Language: We explain things as if we’re sitting right next to you. No “scientific jargon” without a clear explanation first.
Visual Aids: Science is visual. Our notes are packed with flowcharts that summarize 10 pages into one diagram.
Exam-Oriented: We’ve analyzed the last 10 years of papers. We highlight Important Previous Year Questions (PYQs) right next to the topics so you know what’s likely to show up on your paper.
Mobile-Friendly: Whether you’re on a bus or relaxing on the couch, these PDFs are optimized to look great on any screen.
Tips to Score High in Class 9 Science
Master the NCERT Diagrams: In Biology and Physics, a neat, labeled diagram can often get you 3 marks even if your explanation is short. Practice drawing the plant cell and the human ear.
The “Formula Sheet” Trick: For Physics, write every formula from Motion and Work and Energy on a single sheet of paper. Stick it on your wall. Seeing it every day makes it impossible to forget.
Practice Numericals: You can’t “read” Physics; you have to “do” it. Solve at least 5 numericals from each chapter.
Regular Revision: Don’t wait for the final exam. Use our chapter-wise notes to revise every weekend.
Conclusion
Class 9 Science is a journey of discovery. It’s the year you stop asking “what” and start asking “why.” With the right resources, this subject becomes less about memorizing and more about understanding the world around you. We are confident that these notes will be your best companion for the 2026 exams.
Believe in yourself, stay consistent, and remember—every expert was once a beginner.
Ready to Ace Your Exams?