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

question 77

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) Chlorophyll is green and thus reflects green light.
• B) The bacteria were immobile and that is where Engelmann happened to place them.
• C) Photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in those regions.
• D) Photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in those regions.
• E) The most energy-rich wavelengths of light are found at the edges of visible and nonvisible light (ultraviolet and infrared).

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