Watch Educational Videos for Class Nine

Biology Physics Chemistry Maths

Biology             

Cell

The lessons in this topic teach about cell structure, shape, size, different organelles, their function etc.
Cell - An introduction (7:22 min)
Parts Of A Cell (3:38 min)
Cell - Nucleus and Chromosomes (4:01 min)
Prokaryotic And Eukaryotic Cell, Plant And Animal Cell (7:56 min)
Endoplasmic Reticulum (5:10 min)
Golgi Body(2:50 min)
Lysosome (2:23 min)
Vacuole (1:37 min)
Mitochondria (2:54 min)
Plastid (2:54 min)

Plant Tissues

The lessons in this topic teach about different types of tissues in plant and their functions.
Animal and Plant Tissue (3:33 min)
Meristematic Tissue (3:34 min)
Simple Permanent Tissue (5:38 min)
Complex Permanent Tissue (Xylem, Phloem) (4:18 min)

Animal Tissues

The lessons in this topic teach about different types of tissues in animals and their functions.
Epithelium Tissue (5:45 min)
Connective Tissue (4:35 min)
Muscles and Nerves (4:20 min)

Plasma Membrane

The lessons in this topic teach about plasma membrane's structure, function etc.
Plasma Membrane and Osmosis (6:07 min)
Plasma Membrane Functions (2:45 min)
Diffusion (2:35 min)
Reverse Osmosis (2:42 min)

Diversity in Living Organisms

The lessons in this topic teach about diversity of living organism i.e. classification of plant and animal kingdom.
Why Classification Required (6:38 min)
Classification of Living Organisms - Part 1 (5:15 min)
Classification of Living Organisms - Part 2 (3:09 min)
Five Phyla of Plant Kingdom - Overview (2:23 min)
Kingdom Plantae - Part 1 (8:12 min)
Kingdom Plantae (Five Divisions) - Part 2 (3:33 min)
Monocots and Dicots - Overview (3:20 min)
Nine Phyla of Animal Kingdom - Overview(3:02 min)
Kingdom Animalia - Part 1 (7:39 min)
Kingdom Animalia - Part 2 (6:16 min)
Kingdom Animalia - Part 3 (7:24 min)
Kingdom Animalia - Part 4 (7:02 min)
Kingdom Animalia - Part 5 (5:24 min)
Vertebrates - Overview (4:02 min)

Adaptations in Different Ecosystem

The different lessons in this topic explain about habitats and adaptation. It first describes about different habitats and also explains the challenges organisms face in different habitats and how they overcome these challenges through adaptation.
Aquatic habitat (7:28 min)
Forest habitat (10:08 min)
Grassland and Polar habitat (5:56 min)
Desert habitat and adaptation (4:12 min)

Soil Pollution

The topic discusses about soil and its properties. It then discusses about garbage and soil pollution.
Soil Properties (3:56 min)
Fertile soil (3:00 min)
Soil pollution (7:13 min)
Story - Wake Up Before It is Too Late - Part 1 (6:25 min)
Story - Wake Up Before It is Too Late - Part 2 (6:04 min)
Garbage Problem (8:00 min)
Taking Control of Garbage (6:54 min)

Sense Organs

The topic explains about different structure of different sense organs and their functions.
Human eye (6:16 min)
Structure of ear – Part 1 (3:05 min)
Structure of ear – Part 2 (3:49 min)
Structure of ear – Part 3 (5:41 min)
How ear works (2:52 min)
Nose Structure and Functions (2:57 min)
Tongue Structure and Functions (2:57 min)
Skin Structure and Functions (3:54 min)

Physics             

Matter Around Us

The different learning content in this topic explain about different states of Matter e.g. solid, liquid and gas, using the example of a magic show. Understand how matters change state. It starts with an endearing story - “Hole in the water”, which also teaches children that nothing is impossible if you try hard!
The Hole In The Water - Part 1 (7:26 min)
The Hole In The Water - Part 2 (6:12 min)
States Of Matter - Part 1 (10:37 min)
States Of Matter - Part 2 (4:35 min)
Changing States of Matter - Part 3 (3:30 min)
Evaporation in Real Life (5:19 min)
Diffusion in Real Life (3:42 min)

Laws of Motion

The different learning content in this topic explains the concept of Inertia, Momentum and three laws of motions.
Law of Inertia - Part 1 (3:23 min)
Law of Inertia - Part 2 (2:31 min)
Newton's 2nd Law - Part 1 (6:40 min)
Newton's 2nd Law - Part 2 (1:53 min)
Newton's 3rd Law - Part 1 (2:12 min)
Newton's 3rd Law - Part 2 (2:28 min)

Gravitation

The different learning content in this topic explains about gravity, acceleration due to gravitational pull and laws applicable on free falling objects.
What is Gravity (2:24 min)
Newton's Laws of Gravity (4:05 min)
Gravity and Free Falling Object - Part 1 (6:42 min)
Gravity and Free Falling Object - Part 2 (2:04 min)

Sound

The lessons in this topic explain what sound is, how it is produced and how it travels from one place to another place. It also explains why different instruments produce different kind of sound. The lessons give clear ideas about various characteristics of sound and terms related to sound e.g. amplitude, pitch, frequency, echo etc. It starts with a beautiful story - 'Life Is An Echo'.
Story - Life Is An Echo (9:52 min)
What Is Sound (9:14 min)
Sound Requires A Medium (6:38 min)
Characteristics Of Sound (11:42 min)

Motion

The lessons help you to understand linear motion. Understand relations between speed, acceleration and distance though different formulas and graph.
Relative motion (3:45 min)
Distance vs Displacement (3:53 min)
Speed vs Velocity (3:41 min)
Acceleration and Deceleration (5:29 min)
Equations of Motion (5:29 min)
Motion word problems (Negative acceleration) (3:48 min)
Motion word problems (Acceleration) (2:51 min)
Distance-Time Graph (05:04 min)
Velocity-Time Graph (06:31 min)
Velocity-Distance Graph (03:21 min)

Floating Bodies

The topic explains why objects float and sinks. It explains many important law like Law of Archimedes, Pascal’s law and also describes function of hydraulics.
Relative Density - Part 1 (4:10 min)
Relative Density - Part 2 (3:43 min)
Effective Density of Mixture - Part 1 (3:53 min)
Effective Density of Mixture - Part 2 (2:40 min)
Liquid - What floats, What sinks (11:13 min)
Liquid Pressure (3:40 min)
Pascal's Law (2:03 min)
Hydraulics (3:21 min)

Work and Energy

This topic explains about work and energy. It clears the concept of potential and kinetic energy and explains how they are related.
What is Work (5:10 min)
Calculate Work Done (3:49 min)
Energy (4:00 min)
Kinetic Energy - Part 1 (5:02 min)
Kinetic Energy - Part 2 (2:40 min)

Chemistry             

Is Matter Pure

The lessons teach about different types of mixtures and their properties.
Mixture (5:30 min)
Concentration of Solution (5:51 min)
Colloid and its Properties (4:33 min)
Separation Methods (6:16 min)
Pure Substances (3:07 min)

Atoms and Molecules

The different learning content in this topic explains about atom and molecules.
Atom Molecule Introduction (9:23 min)
Dalton's Theory (5:16 min)
Elements and their Symbols(2:56 min)
Atomicity and Valency(7:14 min)
How to write compounds using symbols(7:42 min)
Atomic and Molecular Mass(3:26 min)
Avogadro constant (4:21 min)
Avogadro constant and Molecular Mass (4:03 min)
Mole and Avogadro's number - Part 1 (3:41 min)
Mole and Avogadro's number - Part 2 (4:34 min)

What is Inside Atom

The different learning content in this topic explains what is inside atom, electron configuration etc.
What is inside Atom (5:45 min)
Electrons and Orbits (9:48 min)
Atomic and Mass Number (5:23 min)
Isotope and Isobar (5:00 min)

Maths             

Real Numbers

This topic explains about properties of irrational numbers, difference between rational and irrational numbers and position of different types of numbers on numberline etc.
Real Numbers(4:10 min)
Finding rational numbers on numberline (2:54 min)
Nonterminating recurring decimals(3:35 min)
Rational and Irrational Numbers (2:50 min)
Finding irrational numbers on numberline (6:52 min)
Finding square root of decimal numbers on numberline (5:47 min)
Irrational number addition subtraction (5:01 min)
Irrational number multiplication - Part 1 (4:37 min)
Irrational number multiplication - Part 2 (3:27 min)
Rationalising denominator(7:11 min)
Exponent of real number(6:20 min)

Polynomial and Factorization

The lessons in this topic explain about basic properties of polynomials and its factorization.
Polynomials (4:54 min)
Degree of Polynomials (5:42 min)
Zero of Polynomials (6:31 min)
Zero of Polynomials (3:56 min)
Polynomial Division(6:52 min)
Theory of Remainder (7:39 min)
Factor Theorem (5:52 min)
Polynomial Factorization - Part 1 (6:44 min)
Polynomial Factorization - Part 2 (8:38 min)
Identity 5(4:30 min)
Identity 6 and 7(8:07 min)
Identity 8(4:56 min)

Lines and Angles

The lessons teach about different types of angles formed when two lines intersect or two line intersected by a traversal.
Parallel lines and traversal - Corresponding angles (4:40 min)
Vertically Opposite angles (5:38 min)
Vertically Opposite Angles are Equal (4:12 min)
Parallel lines and traversal - Corresponding angles (5:54 min)
Alternate Angle Theorem(4:08 min)
Theory of Remainder (4:29 min)

Co-Ordinate Geometry

The lessons in this topic explain Cartesian system and how to plot graphs in that system.
Coordinate geometry - Introduction to graph (5:43 min)
What is cartesian system (1:38 min)
Understanding Cartesian System (5:40 min)

Linear Equation in Two Variables

The lessons in this video introduces to linear equation in two variables and show how to find their solution through graph.
Linear Equation in One Variable (2:58 min)
Linear Equation in Two Variables (5:58 min)
Linear Graph of Equation in Two Variables - Part 1 (3:31 min)
Linear Graph of Equation in Two Variables - Part 2 (3:11 min)
Linear Graph of Equation in Two Variables - Part 3 (3:35 min)

Statistics

The lessons in this topic explain about mean, median and mode.
What is Grouped Data (4:38 min)
Mean - Part 1 (4:06 min)
Mean - Part 2 (Ungrouped Frequency distribution) (5:14 min)
Mean - Part 3 (Direct Method for Grouped data) (6:15 min)
Histogram (5:36 min)
Histogram II (5:04 min)
Frequency Polygon (6:33 min)
A dream comes true (4:46 min)
What is median (11:06 min)
How much to order (4:19 min)
What is mode (10:32 min)

Surface areas and Volumes

The following lessons teach how to find surface area and volume of different 3d shapes.
Solid Shapes around us (2:42 min)
Surface Area Problem (2:38 min)
Surface Area of cuboids (4:26 min)
Surface Area of a cube (2:57 min)
Surface Area of a cylinder(8:59 min)
Surface Area of a cone - Part 1 (3:45 min)
Surface Area of a cone - Part 2 (10:53 min)
Volume of a Cuboid (13:55 min)
Volume of a Cylinder (4:13 min)

Probability

The different lessons in this topic explain what probability is. It describes how to measure probability of an event. It explains about sample space, how to measure probability of event from experiment. It gives definition of most likely, sure and impossible event from probability point of view. It starts with an inspiring story – Uncle’s dice.
Uncle's Dice - Part 1 (8:21 min)
Uncle's Dice - Part 2 (7:45 min)
What is Probability (8:29 min)
Probability - Sample Space And Events (6:14 min)

The Elements of Geometry

The lessons in this topic explain few of Euclid’s famous Postulates and Axioms.
Geometry in ancient time (3:28 min)
What are Axioms and Postulates (4:18 min)
Euclid's Axioms - Part 1 (3:58 min)
Euclid's Axioms - Part 2 (3:10 min)
Euclid's Postulates - Part 1 (2:20 min)
Euclid's Postulates - Part 2 (2:08 min)

Triangles

The lessons in topic proves criteria of congruence and few other important theories related to triangle.
SAS axiom and ASA Proof (3:55 min)
Isosceles triangle (2:44 min)
Proof of SSS (2:33 min)

Quadrilaterals

The lessons in this topic proves many theories related to quadrilateral.
Diagonal divides it into two congruent triangle - Proof (1:48 min)
Opposite sides of parallelogram – Proof (3:02 min)
Angles of Parallelogram (3:14 min)
Diagonal of Parallelogram (2:16 min)
Parallel - One pair of side parallel and equal - Proof (2:19 min)
Triangle Midpoint Theory Proof (4:42 min)

Areas

This topic proves some theories that relates triangle and parallelograms on base, between same parallel pair.
Area of Parallelogram within same Parallel - Part 1 (3:29 min)
Area of Parallelogram within same Parallel - Part 2 (2:36 min)
Area of Triangle within same Parallel (2:23 min)

Circles

The lessons prove some theories involving chord and arc of circle.
Properties of circle (6:35 min)
Equal chord subtends equal angle at centre - Proof (3:14 min)
Perpendicular on chord from centre – Part 1 (2:07 min)
Perpendicular on chord from centre – Part 2 (1:52 min)
Equal chords are equidistance from centre - Part 1 (4:14 min)
Equal Arc and Chord of Circle - Part 2 (4:53 min)
Cyclic Quadrilateral (2:43 min)

Geometrical Constructions

The videos in this topic shows construction of perpendicular bisector of line, bisector of angle, triangle etc and explains how those methods work.
Perpendicular bisector (2:57 min)
60 degree angle (1:36 min)
Bisector of angle (2:10 min)
Construction of triangle (2:57 min)
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