What Is Life? 2nd Edition by Jay Phelan

Exercise 9

During photosynthesis, which step is most responsible for a plant's acquisition of new organic material?
A) the "building" of NADPH during the Calvin cycle
B) the excitation of chlorophyll molecules by photons of light
C) the "plucking" of carbon atoms from the air and fixing of them to organic molecules within the chloroplast
D) the loss of water through evaporation
E) the production of ATP during the light reactions