Increased concentration of DDT in fish-eating birds is due to
1. eutrophication
2. bio-magnification
3. cultural eutrophication
4. accelerated eutrophication
Subtopic: Â Water Pollution |
From NCERT
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Ozone gas is continuously formed in the stratosphere by
1. Action of UV rays on nascent oxygen
2. Reaction of oxygen with water vapour
3. Action of UV rays on molecular oxygen
4. Action of UV rays on water vapour
Subtopic: Â Ozone Layer Depletion |
From NCERT
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