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   Natural Resources: Resources include everything provide by the nature. They form the wealth of a country.  Types of Natural […]

   Combustion: The process of burning a substance in the presence of air (oxygen) and undergoes a chemical reaction to […]

   Biodiversity: Occurrence of innumerable number of different types of organisms and the whole range of their varieties (biotypes) adapted to […]

   Cell: The smallest structural and functional unit of an organism, which is typically microscopic and consists of cytoplasm and a […]

   Reproduction is a process in which the organisms produce the young ones of their own kind. There are two modes […]

   Humans become capable of reproduction after puberty sets in. Between the ages of 11 years and 19 years children […]

  Friction is a force that opposes the relative motion between two surfaces of objects in contact. The force of friction […]

  Sound:  Vibrations that travel through the air or another medium and can be heard when they reach a person’s […]

   Materials through which electric current can pass through easily are called conductors of electricity. Electrical conductivity is a measure […]

  Some objects can be charged by rubbing with other objects. There are two kinds of charges — positive charge […]