Question

Black foot disease is caused by the pollution of groundwater as consequence of increased seepage of
A. Nitrates
B. Fluorides
C. Arsenic
D. Mercury

Answer 1

Hint:Black foot disease is a disease which was seen in Taiwan, China and it was passed via drinking water. The disease affected the blood vessels in the human body severely which would lead to gangrene.

Complete answer:
Black foot disease is a severe form of peripheral vascular diseases. Drinking arsenic-rich water over a long period results in various health effects like changing colour of skin, skin cancer etc. Absorption of arsenic through the skin is minimal. In China, exposure to arsenic via drinking water.

Normally, all kinds of water have arsenic but in very small amounts, and in most kinds of water the concentration of arsenic is less than 0.01mg/L. In many countries like the US, India, China and Argentina natural arsenic contamination is a major concern.

Groundwater is likely to be contaminated by arsenic. Due to poor reporting, low levels of awareness the extent of adverse health problems caused by arsenic in drinking. In China, exposure to arsenic via drinking water has caused severe disease of the blood vessels, which leads to gangrene known black foot disease. Arsenicosis is caused by exposure over a period of time to intake of arsenic via food or air, drinking water.

Therefore, from the above explanation the correct option is (C) Arsenic.

Note: The symptoms of black food disease are as follows,
i) Skin becomes pale in colour and cold.
ii) There is a loss of sensation or presence of severe pain in the affected areas.
iii) Redness and swelling is also seen.
iv) Presence of sores or blisters is also seen.