By De, Anil K. De, Arnab Kumar.
Highlights of the booklet comprise: publicity to easy suggestions of setting in multidimensional features; material is gifted in an easy and lucid sort during the ebook with much less pressure on technical bias; word list of keyword phrases (Appendix) is integrated for larger comprehension; and suggestions workouts are incorporated as a bankruptcy to enhance the knowledge of the topic.
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Extra resources for Environmental Engineering
5 TROPHIC LEVELS The transfer of food energy takes place in some hierarchical order in the ecosystem. The food energy passes from one group of organisms to other groups at different levels. These levels are called Trophic levels which mean feeding level of a group of organisms. Trophic Level I: Here we find primary producers or autotrophs which produce their own food by converting solar energy into chemical energy in the form of organic substances such as carbohydrates. The green plants belong to this category.
6 POPULATION GROWTH PATTERN (INDIAN CONTEXT) During the British rule in India the population growth rate was insignificant. Agriculture was neglected and peasants were tortured as a matter of the colonial policy which led to poverty, malnutrition, famine, epidemics and death. 1 per cent during 1911-1921. Slow Population and Environment 33 increase in population was noticed from 1931 onwards which got a boost after Independence in 1947. The population of 340 million in 1947 more than doubled to 683 million in 1981 within a period of 34 years and to over 1 billion in 2000.
Discuss how population pressure affects: (a) Food, (b) Water and (c) Forest Resources. 9. What is P-Triangle? How can we get out of this Triangle? General Concepts 39 Air Pollution Pure air is colourless and odourless. But various pollutants from natural and man-made sources are entering the atmosphere daily and these disturb the dynamic equilibrium in the atmosphere. This leads to air pollution when the normal properties of air are upset and both man and environment suffer. Natural sources of air pollution are: • Volcanic activity, vegetation decay, forest fires emitting carbon monoxide, sulphur dioxide and hydrogen sulphide and tiny particles of solids or liquids sprayed from the seas and land by wind.