Short Answer Type
Long Answer TypeShort 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.
What are pesticides and herbicides? Explain giving examples.
Pesticides: The chemical substances which are used to kill or block the reproductive process in harmful organisms such as rodents, mites, bacteria, fungi etc. Synthetic (man-made) pesticides are broad-based in their action, that is they harm much more organisms than these intended. These substances are non-biodegradable. Pesticides can be divided into three types namely insecticides, herbicides and fungicides.
Herbicides: Herbicides or weedicides are used to kill weeds. Weeds are undesirable plants which grow along with the main crops. Common herbicides are:
(i) 2, 4-D (2, 4-dichloro phenoxy acetic acid)
(ii) MPCA(2- methyl-4-chloro-1-phenoxyacetic acid)
(iii) Butachlor.
The herbicides called triazines are widely used to kill weeds in corn fields.
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