Photons excite electrons in chlorophyll. These electrons are then trapped by the primary electron acceptor. How does the photosystem replace the trapped electrons?
a) The photosystem replaces its light-excited electrons by extracting electrons from oxygen.
b) These electrons are not replaced. A molecule of chlorophyll in a photosystem is used up with each electron transferred.
c) The photosystem replaces its light-excited electrons by extracting electrons from water.
d) The photosystem replaces its light-excited electrons by extracting electrons from carbon dioxide.
e) These electrons are not replaced. There are hundreds of millions of free electrons available in the photosystem at any particular time.
Ans: c) The photosystem replaces its light-excited electrons by extracting electrons from water.
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