What did Engelmann observe from his prism experiments?

Bacteria could not detect the sites of

O_{2}

evolution

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Bacteria released excess carbon dioxide in red and blue light

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Bacteria accumulated due to increase in temperature caused by increase in

O_{2}

concentration

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Bacteria are accumulated towards red and blue light

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Solution

The correct option is D Bacteria are accumulated towards red and blue light
T.W Engelmann: He described the first action spectrum of photosynthesis. By using a prism he split sunlight into its spectral components (VIBGYOR) and then illuminated green algae Cladophora placed in a suspension of aerobic bacteria. The bacteria were used to detect the sites of O $_{2}$ evolution.
Observation:
1. Bacteria accumulated mainly in the region of blue and red light of the split spectrum.
2. It resembles roughly the absorption spectra of chlorophyll a and b.
Hence, the correct answer is 'Bacteria are accumulated towards red and blue light'.

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