What is $B.O.D$?
- AAmount of $O_2$ produced by organisms in water
- BAmount of $O_2$ consumed by microorganisms for decomposition
- CTotal amount of $O_2$ present in water
- DAll of the above
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Consider the following statements:
$I.$ Algal blooms are formed by free-floating algae.
$II.$ Algal blooms cause fish mortality and deterioration of water quality.
$III.$ Water hyacinth, the world's most problematic aquatic weed, is also called 'Terror of Bengal'.
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$III.$ Water hyacinth, the world's most problematic aquatic weed, is also called 'Terror of Bengal'.
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