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An Intiative by Sri Chaitanya
a
If DO of water is below 6 ppm, the growth of fish gets inhibited
b
O2 reaches water through atmosphere or photosynthesis carried out by many aquatic green plants during day light
c
If BOD is below 5 ppm, it indicates polluted water
d
Aerobic bacteria degrade organic waste and decrease DO
answer is C.
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