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Subject :NSO    Class : Class 4

A scientist observed a sudden increase in the number of algae in a lake over a few days. The reason behind it could be that ____________.

AWater cycle in the area got unbalanced
BElectronic wastes were being dumped in a nearby area
CA factory with heavy smoke discharge has been established nearby
DHeavy amount of chemical fertilisers were being used in a nearby field

Option d As heavy amount of chemicals fertilizers were being used in a nearby fiel

Ans 1:

Class : Class 4

Ans 2: (Master Answer)

Class : Class 1


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