1.

A dental disease characterised by mottling of teeth is due to presence of a certain chemical clement in drinking water.Which is that element

Answer»

Boron
Chlorine
Fluorine
Mercury

Solution :The excess of fluorine in water CAUSES fluorosis. The symptoms of fluorosis are motting of teeth (YELLOWISH streaks ) and ABNORMAL bones LIABLE to FRACTURE etc. It is an example of endemic disease.


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