#446 Undesirable Substances

There are a number of substances (toxic as well as non-toxic) which are being added to the environment by pollution-caused [1] . These are, in fact, the undesirable consequences of modern civilization. These substances, which are continuously going into air, water and soil, bring about undesirable [2] in physical, chemical and biological [3] of our environment and the life [4] of animals and plants.