Biology, 14.04.2020 20:13 justapointie

In the early 1880s, German scientist Theodor Engelmann combined a photosynthetic filamentous alga with aerobic, oxygen-seeking bacteria in a tube of water. The alga was long and narrow and lined up in the same direction as the long tube, while the bacteria were much smaller and moved freely within the tube. When Engelmann exposed the tube to white light, the bacteria moved about randomly. When he placed a prism between the light and the tube, the bacteria gathered in two distinct regions along the length of the filamentous algae that correspond to different colors of light from the prism. What did Engelmann's experiment demonstrate

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In the early 1880s, German scientist Theodor Engelmann combined a photosynthetic filamentous alga wi...