In C4 photosynthesis, both C4 and C3 cycles are involved. Identify the catalytic function of RUBISco in C4 cycle

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Question:
In C4 photosynthesis, both C4 and C3 cycles are involved. Identify the catalytic function of RUBISco in C4 cycle

1. Oxygenation of RUBP.

2.Carboxylation of PEP.

3.Carboxylation of RuBp.

4.No function

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