Discussion
Assertion (A): The Calvin cycle is no longer called the dark reaction.
Reason (R): The name suggested that it occurs at night, whereas it runs chiefly in daylight.
Answer: B
Both are true and the reason gives the objection: the cycle needs no light itself but depends completely on products the light reactions supply, so it is most active when the sun is shining. The modern name light-independent reactions avoids that confusion.
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