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 noted that the largest groups were found in the areas illuminated by the red and blue light. Which of the following statements describes a relationship that Engelmann's experiment helped to determine?
A) the relationship between wavelength of light and the rate of aerobic respiration
B) the relationship between wavelength of light and the amount of heat released
C) the relationship between wavelength of light and the rate of photosynthesis
D) the relationship between carbon dioxide concentration and the rate of photosynthesis

Question

Quizplus · Accepted Answer

Engelmann's experiment helped to determine the relationship between wavelength of light and the rate of photosynthesis. He observed that the bacteria congregated in the areas of the algae exposed to red and blue light, which are colors that are optimal for photosynthesis. This suggested that the algae were producing more oxygen in these areas, indicating that photosynthesis was occurring at a higher rate.

Theodor W Engelmann Illuminated a Filament of Algae with Light That