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Question

The first step in dark reaction of photosynthesis is

A
Formation of ATP
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B
Ionization of water
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C
Attachment of CO2 to a pentose sugar
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D
Excitement of electron of chlorophyll by a photon of light
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Solution

The correct option is D Attachment of CO2 to a pentose sugar
The attachment of CO2 to a pentose sugar is the first step in the dark reaction. In this process, ribulose 1,5-diphosphate, a phosphorylated 5 carbon sugar reacts with CO2 in the presence of enzyme RUBISCO to form 3- PGA. ATP formation, ionization of water and excitement of chlorophyll by a photon of light are the steps of the light reaction.
So, the correct answer is option C.

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