If dissolved ______ is not present, the aquatic life would die.

Oxygen

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Nitrogen

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Hydrogen

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None of these

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Solution

The correct option is A Oxygen

Dissolved oxygen means the free or non-compound oxygen present in water or in other liquids. Dissolved oxygen is important to many forms of life including fish, bacteria and plants. These organisms use oxygen in respiration, similar to organisms on land. Fishes obtain oxygen for respiration through their gills, while plant life and phytoplankton require dissolved oxygen for respiration when there is no light for photosynthesis.
So the given statement If dissolved oxygen is not present, the aquatic life would die.

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