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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.

Column-$I$	Column-$II$
$(a)$ Priestley	$(i)$ Sulphur bacteria
$(b)$ Engelmann	$(ii)$ Bell jar
$(c)$ Van Niel	$(iii)$ Aquatic plant
$(d)$ Ingenhousz	$(iv)$ Cladophora

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

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Match the column and select the correct option $:-$
Column-$I$ Column-$II$
$(a)$ Priestley $(i)$ Sulphur bacteria
$(b)$ Engelmann $(ii)$ Bell jar
$(c)$ Van Niel $(iii)$ Aquatic plant
$(d)$ Ingenhousz $(iv)$ Cladophora

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