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Question
Assertion :Algal blooms are formed in nutrient-less water. Reason: Algal blooms in water turn it unfit for humans consumption, but cause enormous growth of fish.
Assertion :Algal blooms are formed in nutrient-less water. Reason: Algal blooms in water turn it unfit for humans consumption, but cause enormous growth of fish.
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Solution
The correct option is D Both Assertion and Reason are incorrect.
Algal blooms are a result of eutrophication. Eutrophication involves change in biological productivity and nutrient content of a water body. Eutrophication literally means 'well nourishes or enriched'. Eutrophication becomes excessive, when abnormally high amount of nutrients from sewage, fertilizers, animal wastage and detergent, enter streams and lakes causing excessive growth or blooms of microorganisms. They are harmful for both humans and aquatic organisms. Eutrophication results in higher BOD and reduced dissolved oxygen in water body. It causes death of fish and other aquatic animals.
Algal blooms are a result of eutrophication. Eutrophication involves change in biological productivity and nutrient content of a water body. Eutrophication literally means 'well nourishes or enriched'. Eutrophication becomes excessive, when abnormally high amount of nutrients from sewage, fertilizers, animal wastage and detergent, enter streams and lakes causing excessive growth or blooms of microorganisms. They are harmful for both humans and aquatic organisms. Eutrophication results in higher BOD and reduced dissolved oxygen in water body. It causes death of fish and other aquatic animals.
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