How Photosynthesis Captures Light and Powers Life on Earth | HowStuffWorks

Photosynthesis is a way to store stable energy.

Ancient bacteria used a thermal-sensing pigment called bacteriochlorophyll to detect the infrared signal generated by heat. These bacteria were the progenitors of descendants that could make chlorophyll. This pigment captures shorter, more energetic light wavelengths from the sun and uses them as a source of power.

The process of capturing and storing sunlight meant that ancient bacteria had to burn water. The method of burning is only oxidation - tearing off of electrons from one atom and transferring those electrons to another.

Early photosynthetic bacteria captured the photons and used their energy to strip water of many of its protons and electrons to use for energy production. Later, chlorophyll could split two water molecules at the same time. We call this a Photosystem II chlorophyll-protein cluster.