Step two - Steptwo:Carbonfixation ,.

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Step two: Carbon fixation The carbon fixation reactions of the second step of photosynthesis are biochemical and use the  energy of ATP and the reducing power of NADPH to repackage the energy in a form that can be  transported and stored, as the carbohydrates sugar and starch. Carbon fixation reactions do not  require light; if cellular energy is available, the reactions occur. Plants have developed three different pathways for photosynthetic carbon fixation, one basic  procedure and two modifications of it. C3 Pathway  (also called the  Calvin cycle  after its 1961 Nobel Prize winning  discoverer). This method is used by most common temperate zone species.  C4  or  Hatch-Slack Pathway . An additional step is added to the Calvin cycle, making  it more efficient for plants structurally modified to do so. Many common grasses and tropical 
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