The green pigment in plants is called chlorophyll. Chlorophyll captures light energy in the blue and red regions of the visible light spectrum.

Here's why:

* Chlorophyll absorbs blue and red light most efficiently: This is because these wavelengths of light have the right energy levels to excite electrons within chlorophyll molecules, initiating the process of photosynthesis.

* Chlorophyll reflects green light: This is why plants appear green to our eyes. The green light isn't absorbed and is instead reflected back.

Let me know if you'd like to learn more about the process of photosynthesis!