Give comparison between the cyclic and non-cyclic photophosphorylation.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
|
Feature |
Cyclic Photophosphorylation |
Non-cyclic Photophosphorylation |
|
Photosystems involved |
PS I only (P700) |
Both PS I and PS II (P700 + P680) |
|
Electron flow |
Cyclic (returns to PS I) |
Linear (H₂O → NADP⁺) |
|
Products |
ATP only |
ATP + NADPH + O₂ |
|
Oxygen evolution |
No (no water splitting) |
Yes (from photolysis) |
|
External electron donor |
Not required |
H₂O required |
|
NADP⁺ reduction |
Does not occur |
Occurs (NADP⁺ → NADPH) |
|
Site |
Stroma lamellae |
Grana thylakoids |
|
Light wavelength |
>680 nm (far-red) |
400-700 nm (full spectrum) |
|
Primary function |
Extra ATP for Calvin cycle |
Provide ATP + NADPH for dark reactions |
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