Question

Aquatic species are more comfortable in cold water because __________

• A. as the temperature decreases the solubility of dissolved oxygen increases.
• B. as the temperature increases the solubility of dissolved oxygen increases.
• C. as the temperature increases the solubility of dissolved oxygen decreases.
• D. as the temperature decreases the solubility of dissolved oxygen decreases.

Answer 1

Answer: (A)

The explanation for the correct option:

Option(B) As the temperature decreases the solubility of dissolved oxygen increases.

• Aquatic species are more comfortable in cold water because as the temperature decreases the solubility of dissolved oxygen increases.

• Gases are usually more soluble at colder temperatures. For example, oxygen is more soluble in cold water than in hot water.
• Dissolved oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms
• Oxygen dissolves in surface water due to the aerating action of winds.
• Oxygen is also introduced into the water as a byproduct of aquatic plant photosynthesis.
• The solubility of oxygen decreases as temperature increases. this means that warmer surface water requires less dissolved oxygen to reach 100% air saturation than does deeper, cooler water.

Hence, Option(B) As the temperature decreases the solubility of dissolved oxygen increases is the correct reason for the comfortability of Aquatic species in cold water.