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Engelmann's experiment with Cladophora and aerobic bacteria established the
AAction spectrum of photosynthesis matching chl a absorption
BQuantum requirement of two photons per each CO2 fixed
CCalvin cycle as a three-stage cyclic biosynthetic process
DZ-scheme of light reactions with PS I and PS II coupled
Answer & Solution
Correct answer: A. Action spectrum of photosynthesis matching chl a absorption
Engelmann split light with a prism over Cladophora and used aerobic bacteria as O2 detectors. Bacteria accumulated under blue and red light, indicating those wavelengths drove photosynthesis the most. This matched chl a's absorption spectrum.
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