Introduction There are some destructive natural phenomena like storms, cyclones, earthquakes and lightning. Human life and property get badly affected by these natural phenomena. But with time we evolved to protect our life from these types of destruction.
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Introduction Materials such as iron, copper, and aluminium are known are conductors of electricity because they allow an electric current to pass through them. Materials such as rubber, plastic and wood are known as insulators or bad conductors of electricity because they do not electric current to pass through them. We can test the conductivity
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Introduction There is a variety of sounds that we hear in our surroundings like the sound of doorbells, the sound of footsteps, the chirping of birds, sound of musical instruments like flute, guitar, table etc. Sound helps us to listen and communicate with one another.
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Introduction Moving objects like a rolling ball or swinging bob of a pendulum slows down slowly and come to rest after some time. This happens because of a force exerted in the opposite direction of the motion of the objects. Friction is a contact force acting in the opposite direction of the applied force. Friction
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Introduction An object like a ball can move from one place to another when you kick it. A moving object can change its direction, move faster or slower for example when a batsman hit a ball, it changes its direction so, what makes an object move, go faster, slow down, or change its direction? We
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Introduction Human beings can reproduce only after a certain age because their reproductive system becomes active after a certain age. The hormonal changes are responsible for transforming a child into an adult. The period of life, when the body undergoes several changes which lead to reproductive maturity, is called adolescence. Adolescence begins at the age
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Reproduction The phenomenon of producing young ones from an existing living organism of the same species is called Reproduction. It is essential for the continuation of a species. Living organisms produce more organisms of their kind to maintain the life of their species on this earth. Reproduction gives rise to more organisms with similar basic
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Introduction Cells are the major structural unit of an organ. Just as bricks are arranged together to make a building, similarly cell is arranged to make body of every organism. In 1665 Robert Hooke observed slices of cork under a magnifying instrument. Cork is a part of the bark of a tree. He detected compartments
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Introduction A great variety of plants and animals exist on earth. The part of the earth which contains living and non- living organisms is called Biosphere. It contains a huge variety of species living together that are interdependent on each other. The presence of a large number of organisms found in a particular area is
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Combustion A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is said to be combustible. It is also called fuel. The fuel may be solid, liquid or gas. Sometimes, light is also given off during combustion, either as a flame or as
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