Which of the following reduces the dissolved oxygen level in water?

Eichhornia

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Dam

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Drought

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Embankment

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Solution

The correct option is A Eichhornia
$∙$ Eichhornia is a water plant.
$∙$ Pollution is the cause of the excess growth of this plant.
$∙$ This plant reduces the oxygen dissolved level in water leading to the death of the living beings underwater.

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