What role does chlorophyll play in photosynthesis?

What role does chlorophyll play in photosynthesis?

• A. It stores glucose
• B. It absorbs light energy to drive the light-dependent reactions
• C. It splits water in the Calvin cycle
• D. It transports electrons to the nucleus

Answer: (B)

Chlorophyll’s job is to capture light energy and initiate the light-dependent reactions. It sits in the chloroplast’s thylakoid membranes, organized in photosystems, and when it absorbs photons its electrons become excited. That energy is transferred to an electron transport chain, driving the flow of electrons that leads to the production of ATP and NADPH. Those energy-rich molecules then power the Calvin cycle, where carbon dioxide is fixed into sugars. So chlorophyll doesn’t store glucose, it doesn’t directly split water in the Calvin cycle, and it doesn’t transport electrons to the nucleus—its essential role is harvesting light energy to kick off the light-dependent reactions.

Chlorophyll’s job is to capture light energy and initiate the light-dependent reactions. It sits in the chloroplast’s thylakoid membranes, organized in photosystems, and when it absorbs photons its electrons become excited. That energy is transferred to an electron transport chain, driving the flow of electrons that leads to the production of ATP and NADPH. Those energy-rich molecules then power the Calvin cycle, where carbon dioxide is fixed into sugars. So chlorophyll doesn’t store glucose, it doesn’t directly split water in the Calvin cycle, and it doesn’t transport electrons to the nucleus—its essential role is harvesting light energy to kick off the light-dependent reactions.