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Class 9 - Science Notes
Browse 15 articles in this category. Choose a title below, or explore the related categories for more reading.
Is Matter Around Us Pure? - 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 same in their chemical nature. That is it is made up of same type of particles and is…
13 min read →Atoms and Molecules - Class 9 Science Notes
Laws of Chemical Combination Antoine L. Lavoisier laid the foundation of chemical sciences by establishing two important Laws of Chemical Combinations, which are: (i) Law of Conservation of Mass (ii)Law of Constant…
10 min read →Structure of Atoms - Class 9 Science Notes
Introduction Matter is made up of fundamental building blocks, that is atoms and molecules. The existence of different kinds of matter is due to different atoms constituting them. Are atoms really indivisible, as…
10 min read →Tissues - Class 9 Science Notes
Introduction In unicellular organisms, a single cell performs all basic functions such as ingestion, digestion, absorption, reproduction, excretion among others. There are no specialized organs to perform these…
16 min read →Diversity in Living Organisms - Class 9 Science Notes
Introduction - Each organism is different from the other to a lesser or greater extent. - On one hand we have microscopic bacteria of a few micrometers in size, while on other hand blue whale and red wood trees of 30…
12 min read →Fundamental Unit of Life - Class 9 Science Notes
Introduction What is a cell? A cell is considered as the building block of life. All living organisms are composed of these microscopic units and it is therefore considered as the basic functional and structural unit of…
16 min read →Motion | CBSE Class 9 Science Notes
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 body is said to be in a state of motion when its position change continuously with…
14 min read →Force and Laws of Motion | CBSE Class 9 Science Notes
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 either push or pull it. Similarly, when a drawer is polled or pushed to open or…
16 min read →Gravitation - Class 9 Science Notes
Introduction What is Gravitational Force? Every object in the universe is attracting every other object of the universe. The force of attraction between any two objects in the universe is known as the “force of…
9 min read →Work and Energy - Class 9 Science Notes
The energy required for the life process comes from food. Activities like playing, singing, reading, writing, thinking, jumping, cycling and running require energy. Work Work done on an object is defined as the product…
6 min read →Sound - Class 9 Science Notes
Introduction Sound is a form of energy which produces sensation of hearing in our ears It is produced due to vibration of different objects. Law of conservation of energy is also applicable to sound. Sound travels in the…
12 min read →Why do we fall ill? - Class 9 Science Notes
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 state of complete physical, mental and social well being. Health of a person depends…
17 min read →Natural Resources - Class 9 Science Notes
Introduction Life on the earth depends on the resources like air, water, soil, etc. The resources available on the earth and the energy from the sun are necessary to meet the basic requirement all life forms on the…
9 min read →Improvement in Food Resources - Class 9 Science Notes
Introduction Food supplies proteins, carbohydrates, fats, vitamins and minerals, which are required for body development, growth and health. Both plants and animals are major sources of food. Green Revolution: Green…
9 min read →Matter in Our Surroundings | CBSE Class 9 Science Notes
Introduction Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a small drop of water or a…
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