| Column I | Column II | ||
| A. | Minamata disease | 1. | Cadmium in water |
| B. | Itai-Itai disease | 2. | Excess of nitrate in drinking water |
| C. | Knock-knees disease | 3. | Mercury in water |
| D. | Methaemoglobinemia | 4. | Excess fluoride |
A) A-1, B-4, C-2, D-3
B) A-3, B-1, C-4, D-2
C) A-2, B-3, C-4, D-1
D) A-3, B-4, C-1, D-2
Correct Answer: B
Solution :
Mercury is converted into methyl mercury by bacterial action in aquatic environment. It resulted in Minamata disease in Japan in 1952 due to eating fishes taken from mercury polluted Minamata bay. Consumption of rice grown on water polluted with cadmium caused disease in Japan called itai-itai. Fluoride toothpastes are used to prevent dental decay but excess causes molted teeth, stiffering of joints and hardened bones called skeletal fluorosis or knock-knee disease. Excess of nitrate in drinking water causes methaemoglobinemia.
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