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Historically, plants have transformed sunlight into chemical energy for their energy needs. This phenomenon, photosynthesis, can only be studied thanks to the findings of scientists Joseph Priestley and Jan Ingen-Housz.

The process of absorbing light mainly occurs thanks to the chlorophyll which is located directly under the surface of the leaf. The pigments gather in reaction centers called photosystems.

Computer animation tracks the passage of electrons and protons through the P680 and P700 photosystems and into the stroma. Photosystems convert solar energy into chemical energy, thereby producing ATP.

Explanation of how plants use carbon dioxide from the atmosphere. A study at the molecular level makes it possible to distinguish between the plants which carry out their photosynthesis in C-3 and those which carry out it in C-4.