Apart from giving plants a green appearance, what is the role of chlorophyll?

Chlorophyll is a vital pigment found in plants, primarily responsible for capturing light energy during photosynthesis. While its green appearance is well-known, its primary function is to absorb sunlight and channel that energy to the photosystems in the thylakoid membranes of chloroplasts. This absorption of light energy is essential for driving the light-dependent reactions of photosynthesis, where water is split, and energizing electrons are transferred through a series of proteins to ultimately form ATP and NADPH, energy carriers used in the synthesis of glucose during the light-independent reactions.

This role of chlorophyll in attracting and capturing sunlight directly ties into the overall efficiency of the photosynthetic process, making option B the correct choice. In contrast, the other options misrepresent the functions associated with chlorophyll: it does not reflect sunlight for energy, does not store energy as glucose (that function is fulfilled later in the photosynthetic process), and does not convert oxygen into carbon dioxide; rather, it plays a role in converting light energy into chemical energy.