Human activities lead to environmental problems such as depletion of ozone layer and production of huge amount of garbage.
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A source of energy is one which provide adequate amount of energy in a convenient form over a long period of time.
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Electromagnets and electric motors involve the magnetic effect of electric current, and electric generators involve the electric effect of moving magnets.
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Direction of current is taken opposite to flow of electrons as electrons were not known at the time when the phenomenon of electricity was discovered first and current was considered to be flow of positive charge.
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Some common phenomena associated with lights are image formation by mirrors, the twinkling of stars, the beautiful colours of a rainbow, bending of light by a medium and so on.
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Gregor Johann Mendel (1822 & 1884) started his experiments on plant breeding and hybridisation. He proposed the laws of inheritance in living organisms.
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Reproduction is the process by which living organisms produce new individuals similar to themselves. It ensures continuity of life on earth.
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The changes in the environment to which the organisms respond and react are called stimuli such as light, heat, cold, sound, smell, touch etc.
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All the processes like respiration, digestion, which together keep the living organisms live and perform the job of body maintenance are called life processes.
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To make the study of these elements easy, these elements have been divided into few groups in such a way that elements in the same group have similar properties..
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