Interdependence of Plants and Animals

The two principal groups of living organisms are plants and animals. From the very early phase of evolution both the communities have lived together side by side in an intimate association to form the biotic environment or biosphere. In a stable ecosystem the plants and animals form a delicate nutritional interdependence which with minor fluctuations …

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Production of X-Rays When highly energetic electrons are made to strike a metal target, electromagnetic radiation comes out. A large part of this radiation has wavelength of the order of 0.1 nm ( 1 A) and is known as X-ray. X-ray was discovered by the German physicist W.c. Roentgen in 1895. He found that photographic …

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