What is the main function of chlorophyll in plants?

The main function of chlorophyll in plants is to absorb light energy for photosynthesis. Chlorophyll is a pigment found primarily in the chloroplasts of plant cells and is crucial for the process of converting solar energy into chemical energy. During photosynthesis, chlorophyll absorbs primarily blue and red wavelengths of light while reflecting green light, which is why plants appear green. This absorption of light energy enables plants to convert carbon dioxide and water into glucose and oxygen, supporting not only their own growth and energy needs but also providing oxygen as a byproduct, essential for aerobic life on Earth.

Other options do not pertain to chlorophyll's primary role. Structural support is provided by cell walls and other components, nutrients are stored primarily in roots and seeds, and water loss regulation is managed by stomata and other tissues. Thus, the function of chlorophyll as an energy absorber is pivotal for the process of photosynthesis and overall plant health and productivity.