C3 plants refer to all the plants, which carry out carbon fixation by the C3 pathway in the second stage of photosynthesis, i.e. dark reaction. In C3 plants atmospheric carbon dioxide directly enters the Calvin cycle and the first product formed is the 3 carbon compound known as 3-phosphoglyceric acid (3PGA). RuBP (5C) is the acceptor of CO2. Calvin cycle also occurs in the C4 and CAM plants but first a 4C organic acid intermediate is formed.
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