In the lagoon sample collected at 2:15 PM, what was the measured dissolved oxygen level?

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Multiple Choice

In the lagoon sample collected at 2:15 PM, what was the measured dissolved oxygen level?

Explanation:
Dissolved oxygen in a lagoon fluctuates with the daily cycle because plants and algae produce oxygen during daylight and organisms consume it at night. By mid‑afternoon, with strong sunlight, photosynthesis tends to boost DO levels in a well‑mixed lagoon. A reading of about 20 mg/L at 2:15 PM fits that daytime peak and indicates good oxygenation. Values around 25 mg/L can occur but are less common and may indicate supersaturation, while 15 mg/L or 10 mg/L would be lower than expected during peak photosynthesis. So, 20 mg/L is the most plausible measurement for that time.

Dissolved oxygen in a lagoon fluctuates with the daily cycle because plants and algae produce oxygen during daylight and organisms consume it at night. By mid‑afternoon, with strong sunlight, photosynthesis tends to boost DO levels in a well‑mixed lagoon. A reading of about 20 mg/L at 2:15 PM fits that daytime peak and indicates good oxygenation. Values around 25 mg/L can occur but are less common and may indicate supersaturation, while 15 mg/L or 10 mg/L would be lower than expected during peak photosynthesis. So, 20 mg/L is the most plausible measurement for that time.

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