Oxygen Levels in the Photic Zone Fluctuate Over the Course

question 33

Multiple Choice

Oxygen levels in the photic zone fluctuate over the course of a 24-hr period.If you were measuring dissolved oxygen over the course of the day,when would you expect to see the lowest levels of oxygen and why?

• A)Mid-morning -- because fish are most active and their respiration rates are highest.
• B)Early afternoon -- when the surface water warms up and sinks to the bottom.
• C)Mid-afternoon -- because the activity of the Calvin cycle (the dark reactions)of photosynthesis are at their peak.
• D)Early evening -- when animals come to feed and disturb the surface waters.
• E)During the night -- because the light reactions of photosynthesis are inactive.

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