Science Class 9 CBSE: Notes & Sample Papers

NCERT Book for Class 9 Science    Chapter 1 – Matter in Our Surroundings  Chapter 2 – Is Matter Around Us Pure  Chapter 3 – Atoms and Molecules  Chapter 4 – Structure of the Atom  Chapter 5 – The Fundamental Unit of Life  Chapter 6 – Tissues  Chapter 7 – Diversity in Living Organisms  Chapter […]

Chapter 1 Matter in Our Surroundings Class 9 Notes Chapter 2 Is Matter Around Us Pure Class 9 Notes Chapter 3 Atoms and Molecules Class 9 Notes Chapter 4 Structure of the Atom Class 9 Notes Chapter 5 The Fundamental Unit of Life Class 9 Notes Chapter 6 Tissues Class 9 Notes Chapter 7 Diversity in Living Organisms Class 9 Notes Chapter 8 Motion Class 9 Notes Chapter 9 Force and Laws […]

Facts that Matter Food supplies proteins, carbohydrates, fats, vitamins and minerals, all of which we require for body development, growth and health. Different crops require different climatic conditions, temperature and photoperiods for their growth and completion of their life cycle. Photoperiods are related to the duration of sunlight. Growth of plants and flowers are dependent […]

Facts that Matter Life exists on earth due to its ambient temperature, water, food and energy from the sun. Lithosphere: The outer crust of the earth is called the lithosphere. Hydrosphere: Sum of all water bodies is called hydrosphere. Atmosphere: Air that covers the earth is called the atmosphere. Biosphere: The life-supporting zone of the […]

Facts that Matter Introduction Health is a state of complete physical, mental and social well-being. Basic conditions for good health: Proper balanced and nutritious diet. Personal hygiene. Clean environment and surroundings. Healthy air, no pollution in the surrounding. Regular exercise. Proper rest. Good standard of living and economic status. Disease: when the body is not at […]

Facts that Matter A sound is a form of energy which produces a sensation of hearing in our ears. Propagation of Sound: Sound is produced by vibrating objects. Medium: The matter or substance through which sound is transmitted is called a medium. It can be solid, liquid or gas. Air is the most common medium for sound […]

Facts that Matter Work: When a force acts on an object and the object shows displacement, the force has done work on the object. Two conditions need to be satisfied for work to be done: (i) A force should act on object (a) The object must be displaced Work = Force x Displacement Unit of workdone […]

Facts that Matter The universal law of gravitation: Every object in the universe attracts every other object with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them. The force is along the line joining the centres of two objects. Let two objects A […]

Facts that Matter Force: It is a push or pulls on an object that produces an acceleration in the body on which it acts. S.I. unit of force is Newton. A force can do three things on a body. It can change the speed of the body. It can change the direction of motion of a […]

Facts that Matter An object is said to be in motion when its position changes with time. We describe the location of an object by specifying a reference point. Motion is relative. The total path covered by an object is said to be the distance travelled by it. The shortest path/distance measured from the initial […]

Facts that Matter Diversity: This earth is full of organisms of various shapes and sizes. The largest Phylum of animal kingdom alone contains over a million species. There are varieties of plants, right from small grasses to tall Eucalyptus trees. This variety in living beings is called diversity. Biodiversity: The variety of animals and plants living in […]

Facts that Matter Tissues Group of cells having a common origin and similar function are termed as tissues. A. Plant tissues: On the basis of the dividing capacity, plant tissues are of two types: Meristematic tissues Permanent tissues 1. Meristematic tissues: Consist of actively-dividing cells. Meristematic tissues are of three types: Apical meristem: Present at the growing tips […]

Facts that Matter The smallest functional unit of life is a cell, discovered by Robert Hooke in 1665. A cell can independently perform all necessary activities to sustain life. Hence cell is the basic unit of life. There are two types of cells plant cell and animal cell. The different cell organelles and their functions […]

Facts that Matter John Dalton assumed that atom is indivisible. In 1866 E. Goldstein discovered the presence of new radiations in a gas discharge tube and called them canal rays. These rays were positively charged radiations which led to the discovery of sub-atomic particle called proton. In 1900 J.J. Thomson discovered the sub-atomic particle—the electron […]

Facts that Matter Law of Chemical Combination Given by Lavoisier and Joseph L. Proust as follows: 1. Law of conservation of mass: Mass can neither be created nor destroyed in a chemical reaction. e.g., A + B → C + D Reactants → Products Mass of reactants = Mass of products 2. Law of constant proportion: In a chemical […]

Facts that Matter Compounds The compound is a pure substance made up of two or more elements combined chemically in a definite ratio. Characteristics: The properties of compound differ from those of its constituents. Compound has fixed melting point and boiling point. Compound is a homogeneous substance. Constituent elements can be separated by chemical process. Mixtures It […]

Facts that Matter Introduction Everything in this universe is made of materials which scientist has names ‘matter’. The matter is made up of very small tiny particles. It is not continuous but is particulate. The matter is anything that occupies space and has mass. Particles of matter have space between them and are continuously moving. Particles of […]

Matter In Our Surroundings   Is Matter Around Us Pure   Atoms And Molecules   Structure Of The Atom   The Fundamental Unit Of Life   Tissues   Diversity In Living Organisms   Motion   Force And Laws Of Motion   Gravitation   Work And Energy   Conservation Of Energy And Power   Sound   […]