In Engelmann's 1882 experiment, why did bacteria cluster in areas of red or blue wavelengths of light?
A)The bacteria used light of those wavelengths for photosynthesis.
B)Algae photosynthesized most efficiently at those wavelengths, producing needed oxygen.
C)The bacteria produced oxygen most efficiently using red and blue light.
D)Algae photosynthesized most efficiently at those wavelengths, producing needed carbon dioxide.
E)The bacteria were attracted to bright light.

Question

Quizplus · Accepted Answer

Engelmann's experiment demonstrated that algae photosynthesized most efficiently at red and blue wavelengths of light, leading to higher oxygen production in those areas. The bacteria, which were aerobic, clustered in these regions to utilize the oxygen produced by the algae.

In Engelmann's 1882 Experiment, Why Did Bacteria Cluster in Areas