Every living and non-living objects in nature is constantly being exposed to a natural background of electromagnetic radiation that comes from space as well is produced by radioactive elements in the Earth’s crust. Animals and plants use electromagnetic radiation for a variety of their living activities e.g. communication, control and regulation of their various physiological, psychological and behavioural functions. Though essential for living organisms, exposure to excess such radiation beyond the naturally evolved tolerance limits causes various harmful effects in them. In present urban, domestic and working place environments, sources of electromagnetic radiations are increasing rapidly. Increasing radiations from sources like power lines, microwave, telecommunication, electrical appliances, radar, transmissions of radio and television etc. are causing the problem of increasing electromagnetic pollution of environment. The effect of increased exposure of electromagnetic radiation on human, animal and plant bodies are now coming to light and are being increasingly studied.