Science Class 5 Pollution

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

A farmer notices that the pond at the edge of his field has turned bright green and the fish have died. What is the most likely sequence of events that caused this?

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A Overfishing caused the algae to grow because there were no fish to eat it.
B Lack of sunlight caused the water to turn green and freeze the fish.
C Excess fertilizer washed into the pond, causing an algae bloom that used up all the oxygen.
D The fish ate the green algae and died from food poisoning.

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Answer: C. Excess fertilizer washed into the pond, causing an algae bloom that used up all the oxygen.

The answer is C) Excess fertilizer washed into the pond, causing an algae bloom that used up all the oxygen, and the explanation is that this process, called eutrophication, leads to oxygen depletion, making it impossible for aquatic animals to survive.

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A farmer notices that the pond at the edge of his field has turned bright green and the fish have died. What is the most likely sequence of events that caused this?

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