G3P refers to Glyceraldehyde 3-phosphate, which is a monophosphate ester. It is a three carbon sugar molecule with molecular formula C₃H₇O₆P. It has high importance in Calvin cycle.
Plants get their carbon dioxide from atmosphere which is captured by the stroma of the chloroplast and then it is utilized in the Calvin cycle. In CAM plants, stomata open during dark and remain closed during day. In photosynthesis, dark reaction is named so because it is independent of light and it ensures assimilation of carbon dioxide and production of glucose. It is also known as Calvin cycle. The statement concerning the electron transport chain that the electron transport chain will work whether oxygen is present or not is false, which suggests option D is the right answer.
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