Which among the following are described as uphill transport of electrons in light reaction of photosynthesis?
A. Movement of electrons from P700 to primary electron acceptor of PSI.
B. Movement of electrons from primary electron acceptor of PSII to system of cytochromes.
C. Movement of electrons from cytochromes to P700.
D. Movement of electrons from P680 to primary electron acceptor of PSII.

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A and D

C and D

A and B

B and C

answer is A.

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Detailed Solution

Movement of electrons from P700 to primary electron acceptor of PSI and movement of electrons from P680 to primary electron acceptor of PSII are described as uphill during which the electrons are excited by absorbing photons. It is endergonic process. The movement of electrons from primary electron acceptor of PSII to system of cytochromes and from cytochromes to P700 is down hill as it is exergonic process during which protons of stroma are carried from stroma and released into lumen of thylakoid.

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