Ethel shiju
from
National Public School Indiranagar, Bangalore
Subject :NSO Class : Class 8
The overuse of fertilisers in a farm results in the runoff pollution of nearby river. Which of the following graphs correctly represents the resulting changes in the levels of oxygen and bacteria in that river?
A
B
C
D
Could someone pls explain?
Ans 2:
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Ans 3:
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NIVED PRAKASH NAIR
from
SARVODAYA, THIRUVANANTHAPURAM
Class : Class 8
The ans is not DEutrophication decreases oxygen and the graph shows increasing oxygen