Question

What is correct for $C_4$ plant ?

• A. $C{O}_2$ combines with PGA
• B. $C{O}_2$ combines with PGAL
• C. $C{O}_2$ combines with RuBP
• D. $C{O}_2$ combines with PEP

Answer 1

The correct option is D $C{O}_2$ combines with PEP

In the $C_4$ pathway, initial carbon fixation takes place in mesophyll cells and the Calvin cycle takes place in bundle-sheath cells.

PEP carboxylase attaches an incoming carbon dioxide molecule to the three-carbon molecule PEP, producing oxaloacetate (a four-carbon molecule).

So, the correct answer is "Option A"