Mention the main causes for water pollution.
Causes of water pollutions are : $(i)$ Pathogens
$(ii)$ Organic wastes
$(iii)$ Chemical pollutants.
What are pesticides and herbicides ? Explain giving examples.
What is troposphere? and Which components are present in troposphere?
Which are the atmospheric air pollutants ?
Write down the reactions involved during the formation of photochemical smog.
What is Bio-chemical oxygen demand ?
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