Assertion: Algal blooms deplete dissolved oxygen levels in polluted water bodies.
Reason: The bioproductivity in water bodies increases due to algal blooms.
Text Solution
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Assertion: True — Algal blooms can deplete dissolved oxygen in polluted water bodies, especially when algae die and decomposers consume oxygen.
Reason: True — Algal blooms increase primary productivity/biomass in water bodies.
However, increased productivity itself does not directly explain oxygen depletion; depletion mainly occurs due to respiration and decomposition of excess algal biomass.
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