Free detailed NCERT Study Notes for CBSE Class 8 Science, Questions with Solutions, Sample Test Papers & Worksheets based on NCERT Books & Syllabus.
After reading these Class 8 Science Revision Study Notes, you can take a quick Online Test to check your understanding of the subject & chapters like Crop Production, Micro-organisms, Synthetic Fibres & Plastics, Metals & Non-Metals, Coal & Petroleum, Combustion & Flame, Conservation of Plants & Animals, The Cell, Reproduction in Animals, Force & Pressure, Friction, Sound, Electric Current & Circuits, Some Natural Phenomena, Light, Stars & The Solar System and Pollution of Air and Water to score better marks.
IMPORTANT TERMS
Agriculture Science that deals with the growth of plants and rearing of animals for food, clothing and other products.
Animal Husbandry Rearing of animals on a large scale for foods and other needs.
Horticulture Art of cultivating fruits, flowers, vegetables and ornamental plants.
Weeds Undesirable plants that grow naturally along Read more...
IMPORTANT TERMS
Polymer - A large molecule formed by the combination of many small molecules.
Biodegradable - Material that gets decomposed through natural processes.
Non-biodegradable - Material which is not easily decomposed through natural processes.
Teflon - A special plastic on which water and oil do not stick, suitable for cookwares.
SYNTHETIC FIBRES
Fibres that Read more...
IMPORTANT TERMS
Fluids Liquids and gases are together known as Fluids.
Net force Overall force acting on an object.
Atmosphere Covering of air around the earth
Manometer An instrument used for measuring the pressure of a fluid.
Barometer An instrument used to measure atmospheric pressure.
Newton (N) The SI unit of Read more...
IMPORTANT TERMS
Malleability The property due to which metals can be beaten into thin sheets.
Sonority Ability to produce a ringing sound when struck.
Ductility Physical ability of a metal to be easily drawn into thin wires.
Lustrous Materials having shiny appearance. E.g. Gold, silver
Corrosion Process of deterioration of metals due to Read more...
Microorganisms
IMPORTANT TERMS
Fermentation Process of conversion of sugar into an acid by the action of microorganisms.
Pasteurisation Process of heating a food to a specific temperature for a specific period of time in order to kill harmful microorganisms.
Preservatives Chemicals used to check the growth of microorganisms in food stuffs.
Communicable diseases Read more...
SOME NATURAL PHENOMENA
IMPORTANT TERMS
Seismograph A device used to measure seismic waves generated by earthquakes.
Seismology The study of earthquakes and seismic waves that move through and around the earth.
Seismologist A scientist who studies earthquakes and seismic waves.
Electroscope A device used to detect the presence and nature of electric charge Read more...
POLLUTION OF AIR AND WATER
IMPORTANT TERMS
Potable Water Water that is suitable for drinking by human beings.
Pollutants Substances that contaminate the air, water and soil.
Smog A fog-like layer in the atmosphere made up of smoke and fog.
Soot Fine black particles, chiefly composed of carbon.
Sewage Waste water generated from Read more...
STARS AND THE SOLAR SYSTEM
IMPORTANT TERMS
Astronomy The branch of science that deals with the study of celestial objects.
An Astronomer A scientist, who studies matter in outer space or celestial objects such as Sun, moon, stars etc.
Orbit The path followed by an object revolving around another object.
Light Year Distance Read more...
Conservation of Plants and Animals
IMPORTANT TERMS
Species A group or class of animals or plants having certain common characteristics which distinguish it from other groups.
Flora Species of plants found in a particular area are termed flora of that area.
Fauna Species of animals living in a particular area Read more...
COMBUSTION AND FLAME
IMPORTANT TERMS
Ignition Temperature The lowest temperature at which a substance catches fire.
Inflammable Substances Substances having low ignition temperature and catch fire easily. e.g. petrol
Calorific Value The amount of heat produced in kilojoules when a gram of fuel is burnt completely.
Fuels Substances which produce heat and light Read more...
SOUND
IMPORTANT TERMS
Sound Sound is Vibrations that travel through a medium and can be heard.
Vibration A vibration is rapid back and forth movement of body about its mean position. This is also known as oscillatory motion.
Amplitude The maximum displacement of any object from its mean position during oscillations is known as amplitude. Read more...
LIGHT
IMPORTANT TERMS
Reflection Reflection is the phenomenon of bouncing back of light to the same medium, after striking a reflecting surface.
Incident Ray A ray coming from an object and striking any surface is called incident ray
Reflected Ray The ray that comes back from a surface after reflection is Read more...
FRICTION
IMPORTANT TERMS
Force Force is a push or pull acting on an object.
Non-contact Force Forces that do not need physical contact with the object on which they are acting are called non-contact forces. Examples- Gravitational Force, Magnetic Force and Electrostatic Force etc.
Contact Force Forces that act on objects by direct or Read more...
CELL: STRUCTURE AND FUNCTIONS
IMPORTANT TERMS
Cell A cell is defined as the smallest structural and functional unit of an organism.
Unicellular Organism Organisms whose body consists of a single cell is called unicellular organisms. For example - Amoeba, Paramecium and bacteria etc.
Multicellular Organism Organisms whose body consists of more than one cell Read more...
REPRODUCTION IN ANIMALS
IMPORTANT TERMS
Reproduction Reproduction may be defined as the process by which living things produce offspring of their own kind.
Asexual Reproduction In asexual reproduction, a new individual is formed from the cell(s) of a single parent. For example- Amoeba, Hydra, Yeast, Starfish etc.
Sexual Reproduction In sexual reproduction, two parents Read more...
ELECTRIC CURRENT AND CIRCUITS
IMPORTANT TERMS
Electric Current Flow of charged particles inside a substance constitutes an electric current.
Conductors Materials in which charged particles can move freely are called as conductors. For example - Metals like Copper, Silver, and Gold etc.
Insulators Materials in which charged particles cannot move freely are called as Read more...
COAL AND PETROLEUM
IMPORTANT TERMS
Calorific Value It is defined as the amount of heat produced in kilojoules when one gram of fuel is completely burned.
Fossil Fuel Fossil fuels are formed from the buried remains of plants and animals over a period of millions of years. Examples - Coal, Petroleum etc.
Refining It Read more...
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