The Following Question(s) Relate to the Data Table Below, Showing

question 11

Multiple Choice

The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.

-What is a possible reason for oxygen to be so low by the end of the night?

• A) Algae produce oxygen as a by-product of photosynthesis mostly during the day, and not at night.
• B) Fish consume oxygen during the night, and oxygen starts to run out by dawn.
• C) Both of these explain the low level of oxygen
• D) Neither of these explains the low level of oxygen

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