The reason the light reactions have both cyclic and noncyclic electron pathways is
a. because the light-independent reactions require ATP and NADPH in different amounts
than are generated by noncyclic electron flow.
b. to ensure that ATP and NAPDH are generated in a 1:1 molar ratio.
c. because only the combination of pathways can generate sufficient NADPH for the lightindependent
reactions.
d. to provide more electrons from water than would be released by the noncyclic pathway.
e. because a single photon of light can't energize a ground state electron in photosystem II to
the level necessary for transfer to photosystem I's primary electron acceptor.
A
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