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(D) The experiment described is the famous action spectrum experiment performed by $T$.$W$. Engelmann in $1883$.He used the green alga $Cladophora$ an

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Blue and red light

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(D) The experiment described is the famous action spectrum experiment performed by $T$.$W$. Engelmann in $1883$.He used the green alga $Cladophora$ and placed it in a suspension of aerobic bacteria $(Azotobacter)$.These bacteria were used to detect the sites of $O_2$ evolution.He split light using a prism to create a spectrum and illuminated the alga.He observed that the bacteria accumulated mainly in the regions of blue and red light,where the rate of photosynthesis was highest,leading to maximum $O_2$ release.

One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of

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Englemann $(1882)$ observed the accumulation of aerobic bacteria around the blue and red light regions of a chloroplast in the green alga $Cladophora$. He therefore concluded that:

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