NCERT Solutions for Class 9 Science provide comprehensive chapter-wise answers, detailed explanations, and step-by-step solutions aligned with the CBSE 2025-26 syllabus to help students master all 15 chapters of the official NCERT textbook.
Class 9 Science forms the foundation for advanced concepts you will encounter in Class 10 board examinations and higher secondary education. The subject integrates three major disciplines—Physics, Chemistry, and Biology—into a unified curriculum designed by the National Council of Educational Research and Training (NCERT). Understanding these concepts thoroughly during Class 9 ensures smoother progression and stronger conceptual clarity in subsequent academic years.
This page serves as your complete resource hub for NCERT Solutions for Class 9 Science, featuring answers to all in-text questions, end-of-chapter exercises, practical-based questions, and higher order thinking skill (HOTS) problems. Each solution follows the exact question sequence from the official NCERT textbook, making it easy to cross-reference while studying. Whether you are preparing for unit tests, half-yearly examinations, or building your foundation for board exams, these solutions offer the structured guidance you need.
Why This Matters: According to CBSE analysis, students who practise NCERT solutions thoroughly score 15-20% higher in examinations compared to those who rely solely on textbook reading. The step-by-step answer format trains you to present responses exactly as examiners expect.
NCERT Solutions for Class 9 Science — Complete Chapter Index
The Class 9 Science curriculum comprises 15 chapters distributed across the three core domains. Below is the complete chapter list with quick navigation links to detailed solutions for each topic. The chapters follow the sequence prescribed in the official NCERT textbook titled “Science” for Class IX, published by NCERT, New Delhi.
| S.No. | Chapter | Go to |
|---|---|---|
| 1 | Matter in Our Surroundings | # |
| 2 | Is Matter Around Us Pure | # |
| 3 | Atoms and Molecules | # |
| 4 | Structure of the Atom | # |
| 5 | The Fundamental Unit of Life | # |
| 6 | Tissues | # |
| 7 | Diversity in Living Organisms | # |
| 8 | Motion | # |
| 9 | Force and Laws of Motion | # |
| 10 | Gravitation | # |
| 11 | Work, Power and Energy | # |
| 12 | Sound | # |
| 13 | Why Do We Fall Ill | # |
| 14 | Natural Resources | # |
| 15 | Improvement in Food Resources | # |
Each chapter section on this page includes solutions for In-text Questions (questions appearing within the chapter text), End-exercise Questions (comprehensive questions at chapter end), Important MCQs, Short Answer Questions, Long Answer Questions, and Practical-based Items. This organisation mirrors how questions appear in CBSE question papers, helping you prepare systematically for examinations.
How to Use These NCERT Solutions Effectively for Exam Preparation
Simply reading solutions without active engagement yields limited results. The following approach, recommended by experienced CBSE educators, maximises learning outcomes and examination performance:
The Concept-Example-Practice Framework: Read the concept explanation in your NCERT textbook first, study the solved example in our solutions to understand the answering methodology, then attempt 2-3 similar questions independently before checking answers. This three-step process builds genuine understanding rather than rote memorisation.
Step 1: Concept Reading — Begin each study session by reading the relevant section in your NCERT textbook. Pay attention to definitions, laws, diagrams, and activities. Note down terms you find difficult.
Step 2: Solution Study — After reading, refer to our solutions for the same section. Observe how answers are structured, how diagrams are labelled, and how numerical problems show step-by-step working with units.
Step 3: Independent Practice — Close this page and attempt end-exercise questions on your own. Write complete answers in your notebook, including diagrams where required. Compare your answers with solutions only after completing.
Step 4: Error Analysis — After each chapter, maintain an error log listing concepts you found challenging or answers you got wrong. Review this log before examinations to address weak areas systematically.
For students seeking additional challenge beyond the standard curriculum, exploring NCERT Solutions for Class 10 Science can provide insight into how current concepts extend to more advanced applications in the following year.
Important: CBSE evaluators award marks for step-by-step working, correct units, labelled diagrams, and precise terminology. Practise writing complete answers rather than just understanding solutions mentally.
Chapter 1: Matter in Our Surroundings — Complete Solutions
This opening chapter of Class 9 Science Chemistry section introduces the physical nature of matter, laying groundwork for all subsequent chemistry chapters. Students learn that matter is made up of particles, these particles have spaces between them, particles are in continuous motion, and particles attract each other. Understanding these postulates helps explain phenomena like diffusion, dissolution, and state changes.
| Section | Anchor | What it covers |
|---|---|---|
| In-text Questions | # | Concept checks after subtopics; short reasoning with examples. |
| NCERT Exercise | # | Definitions, reasoning, numericals on evaporation and cooling. |
| MCQs & VSA | # | One-liners on properties, diffusion, latent heat. |
| Short/Long Answers | # | State changes, factors affecting evaporation, applications. |
| Practical-based | # | Observations on evaporation, cooling, diffusion experiments. |
| HOTS | # | Real-life reasoning; compare evaporation vs. boiling. |
The chapter covers the three states of matter—solid, liquid, and gas—with their characteristic properties including shape, volume, compressibility, fluidity, and density. The kinetic energy of particles determines the state, which can change through heating or cooling. Key concepts include latent heat of fusion, latent heat of vaporisation, sublimation, and factors affecting evaporation (surface area, temperature, humidity, wind speed).
Key Definition: Latent heat of vaporisation is the heat energy required to convert 1 kg of liquid at its boiling point to gas at the same temperature without any rise in temperature. For water, this value is 22.5 × 10⁵ J/kg or 540 cal/g.
In-text questions focus on particle arrangement and movement, while end-exercises test application of concepts to real-life situations like why we feel cool after sweating or why naphthalene balls disappear over time.
Chapter 2: Is Matter Around Us Pure — Complete Solutions
Building on Chapter 1, this chapter teaches classification of matter based on chemical composition. Students learn to distinguish between pure substances (elements and compounds) and mixtures (homogeneous and heterogeneous). The chapter introduces solutions, suspensions, and colloids with their distinguishing properties.
| Section | Anchor | What it covers |
|---|---|---|
| In-text Questions | # | Mixture classification; method selection. |
| NCERT Exercise | # | Flowcharts; purity tests; methods’ principles. |
| MCQs & VSA | # | True/False, matchings on processes and setups. |
| Short/Long Answers | # | Comparisons (distillation vs. fractional distillation, etc.). |
| Practical-based | # | Chromatography strips, crystallisation steps, safety. |
| HOTS | # | Industrial contexts; water purification caselets. |
Solution concepts include solute, solvent, concentration, solubility, and factors affecting solubility (temperature, pressure for gases, nature of solute and solvent). The Tyndall effect differentiates colloids from true solutions. Separation techniques covered include evaporation, centrifugation, chromatography, distillation, fractional distillation, and separation using separating funnel.
Students preparing for competitive examinations should pay special attention to physical and chemical changes, as these concepts appear frequently in Olympiad papers and NTSE examinations.
Chapter 3: Atoms and Molecules — Complete Solutions
This chapter introduces the atomic theory and fundamental concepts of chemistry including atoms, molecules, atomic mass, molecular mass, and the mole concept. These concepts form the foundation for stoichiometry and chemical calculations in higher classes.
Key topics include Laws of Chemical Combination (Law of Conservation of Mass, Law of Constant Proportions), Dalton’s Atomic Theory, writing chemical formulae using valency, molecular formula vs formula unit, and the mole as SI unit for amount of substance. The Avogadro constant (6.022 × 10²³) connects microscopic particles to measurable quantities.
Calculation Tip: When solving mole-based numericals, always write the formula first, substitute values with units, and show unit cancellation. This approach ensures full marks in examinations. Example: Number of moles = Given mass / Molar mass = g / (g/mol) = mol
The numericals in this chapter require careful attention to significant figures and unit conversions. Practice calculating molar mass of compounds, number of atoms/molecules in given mass, and mass of given number of particles.
Chapter 4: Structure of the Atom — Complete Solutions
This chapter traces the historical development of atomic models from Thomson’s plum pudding model through Rutherford’s nuclear model to Bohr’s model. Understanding the experiments that led to each model helps appreciate the scientific method.
Students learn about subatomic particles (electrons, protons, neutrons) and their properties, atomic number, mass number, isotopes, and isobars. The electronic configuration of atoms (2, 8, 18 rule) and concept of valence electrons explain chemical reactivity and valency.
The Rutherford gold foil experiment observations and conclusions are frequently asked questions. Practice drawing atomic structure diagrams with proper labelling of nucleus, shells, and electron arrangement.
Chapter 5: The Fundamental Unit of Life — Complete Solutions
This chapter begins the Biology section with cell biology. Students learn that the cell is the basic structural and functional unit of all living organisms, examining both prokaryotic and eukaryotic cell types.
Detailed study of cell organelles includes cell membrane (selective permeability, osmosis, diffusion), cell wall (in plant cells), nucleus (chromosomes, DNA), cytoplasm, endoplasmic reticulum (rough and smooth), Golgi apparatus, lysosomes, mitochondria, plastids (chloroplasts, chromoplasts, leucoplasts), and vacuoles.
Why This Matters: Cell biology concepts directly connect to topics in Class 10 (life processes, genetics) and Class 11-12 Biology. Strong fundamentals here significantly ease understanding of complex processes like photosynthesis, respiration, and cell division.
Diagram-based questions are very common from this chapter. Practice drawing and labelling plant cell, animal cell, and individual organelles like mitochondria and chloroplast with clear labelling.
Chapter 6: Tissues — Complete Solutions
Extending cell concepts, this chapter covers tissues—groups of cells with similar structure and function. Students learn classification of plant tissues and animal tissues with their locations and functions.
Plant tissues include meristematic tissue (apical, lateral, intercalary) and permanent tissue (simple: parenchyma, collenchyma, sclerenchyma; complex: xylem, phloem). Animal tissues include epithelial tissue (squamous, cuboidal, columnar, stratified), conn
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Traits and examples. |
| Exercise | # | Classification keys; differences. |
| MCQs/VSA | # | Group signatures; quick recall. |
| SA/LA & HOTS | # | Rationale behind grouping; case questions. |
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Concept checks; small numericals. |
| Exercise | # | Graphs; equation applications. |
| MCQs/VSA | # | Definitions, units, slope ideas. |
| SA/LA & HOTS | # | Mixed graphs; multi-step problems. |
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Conceptual reasoning; quick sums. |
| Exercise | # | Momentum, impulse, law applications. |
| MCQs/VSA | # | One-liners on laws, inertia types. |
| SA/LA & HOTS | # | Linked scenarios; FBD-style reasoning. |
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Concept checks; simple g-based sums. |
| Exercise | # | Buoyancy, pressure, floats vs sinks. |
| MCQs/VSA | # | Definitions; unit conversions. |
| SA/LA & Practical | # | Apps of Archimedes; spring balance tasks. |
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Conceptual checks; unit practice. |
| Exercise | # | PE/KE, power rating, efficiency. |
| MCQs/VSA | # | Units, definitions, simple calcs. |
| SA/LA & HOTS | # | Energy transformations; real contexts. |
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Wave relations; quick sums. |
| Exercise | # | Echo/SONAR numericals; definitions. |
| MCQs/VSA | # | Units, ranges, ear parts. |
| SA/LA & Practical | # | Apparatus usage; precautions; graphs. |
| Section | Anchor | Coverage |
|---|---|---|
| In-text | # | Basic distinctions; examples. |
| Exercise | # | Pathogens, vectors, immunity. |
| MCQs/VSA | # | Definitions; prevention strategies. |
| SA/LA & HOTS | # | Community health; case-based items. |