NCERT Class 9 Science – All Chapters

All chapters of NCERT Class 9 Science with notes, solutions, MCQ questions and video lectures. Study each chapter thoroughly with our free CBSE study material.

Chapters List

1

Chapter 1 – Matter in Our Surroundings

Matter is made of tiny particles that have space between them, move continuously, and attract each other. It exists in three states— solid, liquid, and gas—which can change from one state to another with temperature or pressure changes. Evaporation and diffusion are everyday examples of particle movement.

2

Chapter 2 – Is Matter Around Us Pure?

Pure substances consist of a single type of particle, while most matter around us exists as mixtures. Mixtures can be homogeneous (solutions), heterogeneous (suspensions), or colloidal. Physical changes alter appearance without changing composition, whereas chemical changes produce new substances.

3

Chapter 3 – Atoms and Molecules

Matter is made of tiny indivisible particles called atoms, which combine to form molecules and ions. Elements have unique properties and symbols, while compounds have definite compositions. Atomic and molecular masses help in understanding chemical formulas and reactions.

4

Chapter 4 – Structure of the Atom

Atoms are made of subatomic particles—electrons, protons, and neutrons. Different arrangements of electrons determine valency, while atomic number and mass number define elements. Isotopes have the same atomic number but different masses, and isobars have the same mass but different atomic numbers.

5

Chapter 5 – The Fundamental Unit of Life

All living organisms are made of cells, which are the basic structural and functional units of life. Cells contain organelles like nucleus, mitochondria, and chloroplasts that perform specific functions. New cells are formed through cell division, either by mitosis or meiosis.

6

Chapter 6 – Tissues

Multicellular organisms have specialized cells grouped into tissues to perform specific functions efficiently. Plants have meristematic and permanent tissues like xylem and phloem, while animals have epithelial, connective, muscular, and nervous tissues. This division of labor ensures proper growth, support, movement, and coordination in living organisms.

7

Chapter 7 – Motion

Motion is the change in an object’s position with time, which can be straight, circular, or complex. It is described using distance, displacement, speed, velocity, and acceleration. Graphs and equations help represent and analyze uniform and non-uniform motions, including uniform circular motion.

8

Chapter 8 – Force and Laws of Motion

Motion occurs due to forces acting on objects, and all changes in motion require an unbalanced force. Newton’s three laws of motion explain how force, mass, and acceleration interact, and the concepts of inertia, momentum, and action-reaction govern everyday phenomena.

9

Chapter 9 – Gravitation

Gravitation is the universal force of attraction between all objects, responsible for phenomena like free fall, planetary motion, and tides. Weight, buoyancy, thrust, and pressure are effects of gravitational and fluid forces, while Archimedes’ principle explains why objects float or sink in liquids.

10

Chapter 10 – Work and Energy

Work is done when a force causes displacement, and energy is the capacity to do work. Energy exists in various forms like kinetic and potential, and the law of conservation of energy states that total energy remains constant. Power measures the rate at which work is done or energy is transferred.

11

Chapter 11 – Sound

Sound is produced by vibrating objects and travels as longitudinal waves through a medium. It has characteristics like frequency, amplitude, pitch, and intensity. Ultrasound and hearing aids have important applications in medicine, industry, and daily life.

12

Chapter 12 – Improvement in Food Resources

Food for humans comes from crops and livestock, and improving agricultural and animal husbandry practices is essential to meet growing demands. Techniques like crop variety improvement, irrigation, organic farming, poultry, fish farming, and bee-keeping increase production sustainably.