Cyclic-photophosphorylation involves only pigment system-I. When the photons activate PS-I, a pair of electrons are raised to a higher energy level. They are captured by primary acceptor, which passes them on to ferredoxin, plastoquinone, cytochrome complex, plastocyanin and finallyback to reaction centre of PS-I, ie, P700. At each step of electron transfer, the electrons lose potential energy. Their trip down hill is caused by the transport chain to pump H+across the thylakoid membrane. The proton gradient thus established is responsible for forming ATP (2 molecules). No reduction of NADP to NADPH +H+.
Cyclic-photophosphorylation results in the formation of
NEET UG 2009 — Botany Respiration in Plants
2009mcqmedium
Cyclic-photophosphorylation results in the formation of
Official previous-year question
Held on 30 Apr 2009 · Verified 9 Jul 2026.
Options
- A
NADPH
- B
ATP and NADPH
- C
ATP, NADPH and O2
- D
ATP
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