Certain Bacterial Photoautotrophs Use Bacteriochlorophyll for Photosynthesis

question 27

Multiple Choice

Certain bacterial photoautotrophs use bacteriochlorophyll for photosynthesis.Bacteriochlorophyll molecules absorb light of longer wavelengths than the chlorophyll a molecules of other photosynthesizing organisms.The longer wavelengths pass through other organisms.What is the ecological advantage to this?

• A) Bacteria can grow below dense layers of algae, using light not absorbed by the algae.
• B) Bacteria can grow beneath algae layers because short wavelengths passing through algae are converted to longer wavelengths.
• C) Bacteria can grow above algae because absorption of long wavelengths helps algae, on which bacteria feed.
• D) The long wavelengths are absorbed and used to produce bioluminescence.
• E) There is no ecological advantage to absorbing light of a longer wavelength.

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