The events of photosynthesis may be covered under three phases:

Phase 1: Absorption and retention of light by the photosynthetic pigments

Phase II: Conversion of light energy absorbed in phase I into another species of energy, the chemical energy(ATP and NADPH2) by photophosporylation.

Phase III: The chemical energy so trapped in ATP and NADPH2 in the earlier phase is comfortably stored in stable products like starch by Calvin cycle reactions or Hatch & Slack Pathway or by the reactions of Crassulacean Acid Metabolism.

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