The experimental study of photosynthesis is beginning to reveal new physics. Already now it has become clear that quantum effects in much longer scales as believed in orthodoxy are involved. The latest revelation is decribed in a Science News article. The title is Unusual Quantum Effect Discovered in Earliest Stages of Photosynthesis. When photon excites the cell, it excites one electron inside chromophore. The surprising finding was that single photon actually excites several chromophores simultaneously!
What does this statement mean? One could think photon as a finite sized object (in TGD Universe space-time sheet that I have used to call "massless extremal") with size scale of wavelength which for visible photons is of order cell size. The photon would excite a superposition of states in which one of the chromophores is excited. The system formed by chromophores behaves as quantum coherent system. If quantum coherence is not present, one can say that photon excites just single chromophore at time.
Quantum coherence makes possible amplification for the rate of process. In incoherent situation the rate would be proportional to the number N of chromophores. In coherent situation it would in the optimal case be proportional to N2 (constructive interference). Note that one could imagine also second option in which photon literally excites several electrons belonging to different chromophores separately but this does not make sense to me.
This kind of simultaneous excitation would make sense in TGD framework if photo space-time sheet has size of order wave length, which is indeed of the order of cell size. If photon is dark then its size is scaled by the ratio hbar/hbar0 so that even chromophores in several cells could be excited simultaneously!
For TGD based model of photosynthesis see the chapter Macroscopic quantum coherences and quantum metabolism as different sides of the same coin: part I of "TGD Universe as a Conscious Hologram".