[The principle of instantaneous action in photosynthesis]

The principle of instant action for photosynthesis is grounded. According to this principle, all primary photophysical events of energy delivery from light harvesting Chl molecules to reaction centres proceed at time intervals not exceeding critical value approximating 10(-10) seconds. This provides: a) high quantum yield (more then 90%) of primary photosynthesis: b) Chl protection from irreversible photodestruction. Original experimental data obtained by V.I. Godik and the author support the above principle at least for purple bacteria, green bacteria and photosystem I of plants.