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The green alga used by T.W Engelmann in his prism experiment is
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Cladophora
T.W Engelmann by using a prism split light into its spectral components and then illuminated a green alga, Cladophora, placed in a suspension of aerobic bacteria. The bacteria were used to detect the sites of O2 evolution. He observed that the bacteria accumulated mainly in the region of blue and red light of the split spectrum.
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