A) PGA
B) Oxalo acetic add
C) RuDP
D) PEP
Correct Answer: D
Solution :
Primary \[C{{O}_{2}}\] acceptor in \[{{C}_{4}}\] plants is PEP or phosphoenol pyruvate, combination of \[C{{O}_{2}}\]with PEP is called initial fixation and occurs in mesophyll cells. The enzyme required is PEP carboxylase. PGA (Phosphoglyceric Acid) is the first stable product of Calvin cycle or \[{{C}_{3}}\] cycle or reductive pentose pathway or photcsynthetic carbon reduction. RuBP was formerly known as RuDP (Ribulose Diphosphate). It is first \[C{{O}_{2}}\] acceptor in \[{{C}_{3}}\] plants. Oxaloacetic acid is the first product of \[{{C}_{4}}\] cycle. It is unstable compound which is changed to maloic acid/aspartic acid for transport to bundle sheath cells.
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