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  4. The common molecule between the Kreb cycle and C4 pathway is

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Q. The common molecule between the Kreb cycle and C4 pathway is

NTA AbhyasNTA Abhyas 2020Photosynthesis in Higher Plants

Solution:

The primary acceptor of CO2 in C4 plants is phosphoenolpyruvate or PEP. PEP in mesophyll cells combine with CO2 and converted into 4 carbon compound oxaloacetic acid by PEP carboxylase. In C3 plant ribulose1,5-diphosphate is the primary acceptor of CO2.​
In the Kreb cycle, oxaloacetic acid combines with acetyl Co-A to form the first stable product called citric acid.