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

Multiple Choice

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.