Question

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. this experiment helped to determine the relationship between which of the following parameters?

heterotrophic and autotrophic organisms

wavelengths of light and the rate of aerobic respiration

wavelengths of light and the amount of heat released

wavelengths of light and the rate of photosynthesis

the concentration of carbon dioxide and the rate of photosynthesis

Explanation:

Engelmann's experiment used aerobic bacteria (which need oxygen) to indicate where oxygen was produced (by photosynthesis). Different wavelengths of light were tested. Since more bacteria (needing oxygen from photosynthesis) were in red - and blue - light areas, it shows a relationship between light wavelengths and photosynthesis rate.

Answer:

wavelengths of light and the rate of photosynthesis