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Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Cyclic and Non-cyclic Photo-phosphorylation

  • Photophosphorylation - Synthesis of ATP from ADP and inorganic phosphate in the presence of light, occurring in chloroplasts and mitochondria.
  • Non-Cyclic Photophosphorylation - Both PS II and PS I work in series (Z scheme). Produces both ATP and NADPH + H⁺. Electrons do not return to PS II.
  • Cyclic Photophosphorylation - Only PS I functions; electrons circulate within the photosystem and return to PS I via the electron transport chain. Produces ATP only (no NADPH, no O₂).
  • Location - Grana contain both PS I and PS II → non-cyclic occurs here. Stroma lamellae lack PS II and NADP reductase → cyclic occurs here.
  • Cyclic photophosphorylation also occurs when only light beyond 680 nm is available for excitation.
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