[robochat]

There's been some hypotheses of photosynthesis relying on quantum effects to improve its efficiency but it's still contentious the last that I checked [1].

[1] https://physicsworld.com/a/is-photosynthesis-quantum-ish/

[Kim_Bruning]

From what I remember, photosynthesis directly deals with photons, electrons (e-) , and protons (H+), so I'd say it's a quantum process to begin with?