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Environmental Issues

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Plant Growth and Development
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Microbes in Human Welfare
Strategies for Enhancement in Food Production
Molecular Basis of Inheritance
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  1. Biochemical Oxygen Demand (BOD) in a river water
    1. has no relationship with concentration of oxygen in the water.
    2. gives a measure of Salmonella in the water.
    3. increases when sewage gets mixed with river water.
    4. remains unchanged when algal bloom occurs.
Correct Option: C

Biochemical Oxygen Demand (BOD) in a river water increases when sewage gets mixed with river water. Biochemical oxygen demand or biological oxygen demand (BOD) is a chemical procedure for determining how fast biological organisms use up oxygen in a body of water. It is used in water quality management and assessment, ecology and environmental science. BOD considered as an indication of the quality of a water source.


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