Ravi has purchased an aquarium and was surprised to know that regular cleaning of
aquariums is essential. Why does it have to be regularly cleaned?
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A.
Dead fish and plants may spoil the electric supply of the aquarium.
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B.
Dead fish and plants are decomposed by microorganisms and smell bad.
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C.
Dead fish and plants should be disposed of in the soil, not in water.
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D.
Dead fish and plants may spoil the aeration system of the aquarium.
Correct Answer:
C. Dead fish and plants should be disposed of in the soil, not in water.
Explanation:
Aquariums must be cleaned regularly because they are artificial environments that lack the natural self-cleansing mechanisms found in nature. Organic waste from dead fish and plants is broken down by microorganisms, which can lead to the buildup of toxic substances and unpleasant odors, making manual maintenance essential to keep the ecosystem healthy.
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