The water quality of a pond was analysed and its BOD was found to be 4. The pond has
- Water has high amount of fluoride compounds
- Highly polluted water
- Very clean water
- Slightly polluted water
The Correct Option is C
Solution and Explanation
BOD (Biochemical Oxygen Demand) is a measure of the amount of oxygen consumed by microorganisms in the breakdown of organic matter.
A BOD value of 0-5 indicates very clean water, as there is little organic matter to decompose.
A BOD of 6-15 indicates moderately polluted water.
A BOD higher than 15 suggests highly polluted water.
Since the BOD is 4, it indicates very clean water.
Thus, the correct answer is: (3) Very clean water.
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Concepts Used:
Water Pollution
- Water pollution means the contamination of water bodies such as seas, lakes, rivers, aquifers, oceans, and groundwater caused majorly due to inhuman activities with industrial and agricultural effluents. It is the change of chemical, biological, or physical properties of water that will result in a destructive consequence for living organisms.
- Portable water is considered safe for human and animal consumption as well as used for drinking, cooking, crop irrigation, washing, etc,. Nowadays, chemicals, bacteria, and other pollutants are also influencing this. It adversely acts on all the living forms, directly or indirectly depending upon the source. The effects of water pollution can be felt for years to come.
Sources of Water Pollution:
The following are the major sources of Water Pollution:
- Domestic Waste
- Urbanization
- Deforestation
- Industrial effluents
- Social and Religious Practices
- Insecticides and pesticides
- Detergents and Fertilizers