Question

With the rise of water temperature, dissolved oxygen

• A. Remains unchanged
• B. Increases in amount
• C. Decreases in amount
• D. Is more available to the aquatic organisms

Answer 1

The correct option is C Decreases in amount

Dissolved oxygen is the free oxygen in the liquid. It is the form which is not present in combined form with any compound and can be available for the organisms in the aquatic environment. When there is rise in temperature, the dissolved oxygen starts to react with the other molecules. This results in the formation of compounds. The rise in temperature causes decrease in the level of dissolved oxygen.

Thus the correct answer is option C.