The statement that justifies the researcher's claim about color change in the culture is: (4) In green light, more phycoerythrin molecules are produced, allowing more green light to be absorbed, thus increasing photosynthesis.
Phycoerythrin is a red-colored pigment present in red algae as well as some cyanobacteria. It belongs to the family of phycobiliproteins. It acts as an accessory pigment to absorb the sunlight energy and transfer it to the reaction center.
Photosynthesis is the process of synthesizing food by the plant by using the inorganic raw material. It is performed in two parts: light-depending reactions and light-independent reactions.
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