What pigment is responsible for capturing light energy in the chloroplasts?

The pigment responsible for capturing light energy in the chloroplasts is chlorophyll. Chlorophyll is crucial for the process of photosynthesis, as it absorbs light, primarily in the blue and red wavelengths, and reflects green light, which is why plants appear green. This absorption of light energy initiates a series of biochemical reactions that convert carbon dioxide and water into glucose and oxygen, providing the necessary energy for the plant and, indirectly, for most life on Earth.

While other pigments like carotenoids and xanthophylls also play roles in photosynthesis—mainly in protecting the plant from excess light and contributing to light absorption—they are not the primary pigments responsible for capturing light energy. Chloroplastin is not a recognized pigment in the context of photosynthesis in plants. Thus, chlorophyll is the correct answer due to its central role in harvesting light energy effectively.