Class 9 Science Notes

Introduction How do we define pure? The use of word ‘Pure’ in science means that all the constituent particles of a substance are the...

Laws of Chemical Combination Antoine L. Lavoisier laid the foundation of chemical sciences by establishing two important Laws of Chemical...

Introduction Matter is made up of fundamental building blocks, that is atoms and molecules. The existence of different kinds of matter is...

Introduction In unicellular organisms, a single cell performs all basic functions such as ingestion, digestion, absorption, reproduction,...

Introduction - Each organism is different from the other to a lesser or greater extent. - On one hand we have microscopic bacteria of a...

Introduction What is a cell? A cell is considered as the building block of life. All living organisms are composed of these microscopic...

Introduction Rest: A body is said to be in a state of rest when its position does not change with respect to a reference point. Motion: A...

Introduction Force can be called as a push or pull on the object that enables us to do any work. For example in order to open the door we...

Introduction What is Gravitational Force? Every object in the universe is attracting every other object of the universe. The force of...

The energy required for the life process comes from food. Activities like playing, singing, reading, writing, thinking, jumping, cycling...

Introduction Sound is a form of energy which produces sensation of hearing in our ears It is produced due to vibration of different...

What is Health? Health is a state of complete physical, mental and social well-being. It is not merely the absence of diseases. It is a...

Introduction Life on the earth depends on the resources like air, water, soil, etc. The resources available on the earth and the energy...

Introduction Food supplies proteins, carbohydrates, fats, vitamins and minerals, which are required for body development, growth and...

Introduction Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we...