Short Answer Type
Long Answer TypeWhat processes are generally responsible for the deoxygenation of water?
Deoxygenation of water takes place through the following processes:
(i) Oxidation of organic matter: The dissolved oxygen in water is consumed rapidly by microorganisms to oxidise organic matter of sewage.
(ii) Bio-oxidation of the nitrogenous matter: Oxygen in water may be consumed by the bio-oxidation of the nitrogenous material. 
(iii) Oxidation of chemical reducing agent: The dissolved oxygen in water may be consumed by the chemical or biochemical oxidation of chemical reducing agents. 
Short Answer TypeLong Answer TypeWhat are the different sources of soil pollution? Discuss various measures for controlling soil pollution.
Explain giving reactions, the plausible explanation for the escape of methyl isocyanate gas from the Union Carbide Ltd. Plant in Bhopal on Dec 2, 1984.
Short Answer TypeFor your agricultural field or garden, you have developed a compost producing pit. Discuss the process in the light of bad odour, files and recycling of wastes for a good produce.
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