Theodor WEngelmann Illuminated a Filament of Algae with Light That Passed

question 18

Multiple Choice

Theodor W.Engelmann illuminated a filament of algae with light that passed through a prism,thus exposing different segments of algae to different wavelengths of light.He added aerobic bacteria and then noted in which areas the bacteria congregated.He found that the largest groups were found in the areas illuminated by the red and blue light.What would you predict would happen if you ran the same experiment without passing light through a prism?

• A)The bacteria would congregate toward the middle of the algal filament.
• B)The bacteria would be relatively evenly distributed along the algal filament.
• C)The number of bacteria present would decrease due to an increase in the carbon dioxide concentration.
• D)The bacteria would congregate toward the two ends of the algal filament.
• E)The number of bacteria would decrease due to a lack of oxygen.