In Engelmann's Classic Experiment, Why Were the Oxygen-Requiring Bacteria Clustered

question 7

Multiple Choice

In Engelmann's classic experiment, why were the oxygen-requiring bacteria clustered around the regions of Spirogyra algae that were bathed in red, blue, and violet light?

• A)because photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in those regions
• B)because chlorophyll is green and thus reflects green light
• C)because photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in those regions
• D)because the bacteria were immobile and that is where Engelmann happened to place them

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