If the normal plant were kept in a dark room then Calvin cycle eventually stop as the product of the light reaction are needed for the Calvin cycle to occur. The correct option is C.
Carbon atoms from CO2 used to build three-carbon sugars in the Calvin cycle. This process is powered by and dependent on the light reactions' ATP and NADPH.
If the normal plant were kept in a dark room then Calvin cycle eventually stop as the product of the light reaction are needed for the Calvin cycle to occur.
Thus, the correct option is C.
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