Question
Biology Question on evolution
A dental disease characterized by mottling of teeth is due to the presence of certain chemical element in drinking water. Which of the following is that element?
A
fluorine
B
boron
C
mercury
D
chlorine.
Answer
fluorine
Explanation
Solution
Fluorides are given out during refining of materials. Fluorides cause flourosis. It is a disease which is defined by mottling of teeth, abnormal bones that "are liable to fracture because flourine replaces Ca2+ and" makes the bones brittle. Fluoride pollution is a serious problem in many districts of Rajasthan, where excess of fluoride in water adversely affects the health of man. Many villagers have aged prematurely or became hunch backs.