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What did Engelmann conclude about the congregation of bacteria in the red and blue areas?


  1. Bacteria congregated in these areas due to an increase in the temperature of the red and blue light.

  2. Bacteria released excess carbon dioxide in these areas.

  3. Bacteria congregated in these areas because these areas had the most oxygen being released.

  4. Bacteria are attracted to red and blue light and thus these wavelengths are more reactive than other wavelengths.


Solution

The correct option is C

Bacteria congregated in these areas because these areas had the most oxygen being released.


Engelmann used oxygen loving bacteria to grow on the algae. The bacteria congregating in the region of the red and blue light indicated that there was more oxygen being produced in these areas, indicating there was more photosynthetic activity in these areas. Thus Engelmann concluded that the red and blue light of the visible spectrum generate more photosynthetic activity than other parts of the visible spectrum.

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