Class 7 Science Revision Notes
Nutrition in Plants Notes
Nutrition in Plants — Notes Nutrition is the process of taking in food and using it for energy, growth and repair. Modes of nutrition Autotrophic: organisms that make their own fo…
Nutrition in Animals Notes
Nutrition in Animals — Notes Animals take in food and break it down to absorb nutrients. Steps of nutrition Ingestion, digestion, absorption, assimilation and egestion (removal of…
Heat Notes
Heat — Notes Heat is a form of energy that flows from a hotter to a colder body. Temperature and thermometers Temperature measures how hot or cold an object is, in degrees Celsius…
Acids, Bases and Salts Notes
Acids, Bases and Salts — Notes Acids and bases Acids taste sour and turn blue litmus red (e.g. lemon, vinegar, curd). Bases taste bitter, feel soapy and turn red litmus blue (e.g.…
Physical and Chemical Changes Notes
Physical and Chemical Changes — Notes Physical changes In a physical change , no new substance is formed, and the change is usually reversible — only the shape, size or state chan…
Respiration in Organisms Notes
Respiration in Organisms — Notes Respiration releases energy from food in the cells of all living things. Types of respiration Aerobic respiration: uses oxygen and releases more e…
Transportation in Animals and Plants Notes
Transportation in Animals and Plants — Notes Transport in humans The circulatory system carries materials around the body. Blood has plasma, red cells (carry oxygen using haemoglo…
Motion and Time Notes
Motion and Time — Notes Speed Speed tells how fast an object moves: The unit is metre per second (m/s) or kilometre per hour (km/h). Uniform motion: equal distances in equal inter…
Electric Current and its Effects Notes
Electric Current and its Effects — Notes Symbols and circuits Electric components are drawn using standard symbols (cell, battery, bulb, switch, wire). A circuit must be closed fo…
Light Notes
Light — Notes Light travels in straight lines and lets us see objects. Reflection Light bounces back from a shiny surface ( reflection ). A plane mirror forms an image that is: of…