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  4. The first stable compound of the Calvin cycle is

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Q. The first stable compound of the Calvin cycle is

NTA AbhyasNTA Abhyas 2020Photosynthesis in Higher Plants

Solution:

The first step of the Calvin Cycle is when RuBP combines with $CO_2$ to form a 6 carbon unstable compound in the presence of enzyme RubisCO. This 6 carbon compound spontaneously forms two molecules of 3C compound called phosphoglyceric acid, which is the first stable compound of the Calvin cycle. Hence, it is also called $C_3$ cycle.