Chapter 10

Last update by mayurcooled on 04/16/2014
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In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
a. autotrophs and heterotrophs
b. producers and primary consumers
c. photosynthesis
d. autotrophs
e. green plants

Answer:
D: autotrophs

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    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.

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    An outcome of this experiment was to help determine
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    What wavelength of light in the figure is most effective in driving photosynthesis?
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