Evaluation · Q13
Q.Excess of fluoride in drinking water causes:
a) Lung disease
b) Intestinal infection
c) Fluorosis
d) None of the above
Tamil Nadu DgeNCERTSubjectiveImportance★★★★★est
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Concept understanding — Water Pollution and Its Control
Water quality is judged across physical, chemical, biological and aesthetic characteristics, and water pollution occurs whenever a change in these makes water harmful to the organisms that consume or live in it -- effectively, water becomes 'polluted' once it is unfit for its intended use. Sources are classified as point sources (traceable discharges like factory effluent and sewage pipes), non-point sources (diffuse inputs like acid rain and agricu …
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