Final answer:
Chlorophyll's most important role during photosynthesis is converting light energy from the sun into chemical energy.
Step-by-step explanation:
Chlorophyll's most important role during photosynthesis is converting light energy from the sun into chemical energy. Chlorophyll is the green pigment found in plants that captures energy from the sun. When a chlorophyll molecule absorbs light energy, electrons are excited and transfer the energy to a series of carrier molecules, ultimately leading to the production of ATP, the main source of chemical energy in cells.