Chemistry - Environmental Chemistry Question with Solution | TestHub
ChemistryEnvironmental ChemistryWater PollutionMedium2 minQB
ChemistryMediumsingle choice
A large number of fishes are suddenly found floating dead on lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton.
Select reason for deth of fishes : -
Options:
Answer:
C
Solution:
Excess phytoplankton growth (algal bloom) is followed by their decomposition by microorganisms.
During decomposition, a large amount of dissolved oxygen (DO) is consumed.
The decrease in oxygen level causes suffocation and death of fishes.
Hence correct answer is (C) Level of O₂ decreases due to degradation of phytoplankton
Stream:JEESubject:ChemistryTopic:Environmental ChemistrySubtopic:Water Pollution
⏱ 2mℹ️ Source: QB
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