Light-absorbing pigments that are not at the reaction center of a photosystem: a. are all constructed from chlorophyll. b. are free floating in the stroma. c. increase the amount of the visible light spectrum that can be harnessed for photosynthesis. d. enable photosynthesis to occur in the dark for a short period of time. e. are identical in all plant species.

Light   absorbing  pigment    that   are  not   at  the   reaction  center  of  a   photosystem  increases  the  amount  of  the  visible  light  spectrum  that  can  be  harnessed  for  photosynthesis (answer C).  The  chlorophyll  is  the  reaction  center.  whereby  light  is absorbed  by  chlorophyll and molecules  are  bound  to  reaction  center  protein  in the  thylakoid  membrane.