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(B) The first action spectrum of photosynthesis was described by $T$.$W$. Engelmann. He used a prism to split light into its spectral components and t

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Unicellular green alga Chlorella

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(B) The first action spectrum of photosynthesis was described by $T$.$W$. Engelmann. He used a prism to 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 $O_2$ evolution. He observed that the bacteria accumulated mainly in the region of blue and red light of the split spectrum. $Chlorella$ was used by Robert Hill in his experiments to study the light and dark phases of photosynthesis,not by Engelmann.

The curve showing the effectiveness of different wavelengths of light in photosynthesis was first given by Engelmann using all,except:

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