Why is it necessary to measure the $BOD$ value of water?
- ATo determine the amount of dissolved oxygen.
- BTo measure the extent of pollution caused by biodegradable organic matter.
- CTo check the concentration of heavy metals.
- DTo measure the acidity of water.
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$(1)$ Deficiency of fluoride is responsible for ............. .
$(2)$ The upper limit of lead concentration in drinking water is ............. .
$(3)$ The maximum limit of nitrate in drinking water is ............. .
$(4)$ ............. and ............. chemicals act as poisons for the nervous system.
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$(2)$ The upper limit of lead concentration in drinking water is ............. .
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$(4)$ ............. and ............. chemicals act as poisons for the nervous system.
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