Assertion: Algal blooms deplete dissolved oxygen levels in polluted waterbodies. Reason: The bio productivity of water bodies increases due to algal blooms.
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An overgrowth of algae in a small period due to the excess of nitrogen and phosphorous.
This overgrowth consumes oxygen, and the sunlight is blocked for the underwater plants.
The death of oxygen also leads to oxygen consumption.
Hence, the assertion is true.
The reason the bio productivity of water bodies increases due to algal blooms is true.
As the number of autotrophic organisms in the lake increases, this causes an increase in bio productivity.
Hence, both the assertion and the reason are true, but the reason does not explain the assertion.
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