A) PEP
B) PGA
C) RuBP
D) pyruvic acid
E) OAA
Correct Answer: A
Solution :
In \[{{C}_{4}}\text{-}\]plants bundle sheath cells of leaf show Kranz anatomy. In these plants the\[C{{O}_{2}}\]first accepted in the mesophyll cells by PEP (Phosphoenol Pyruvate) to form a four carbon compound oxaloacetic acid. Phosphoenol pyruvate\[+C{{O}_{2}}\xrightarrow[\text{Carboxylase}]{\text{PEP}}\]Oxaloacetic acid In \[{{C}_{3}}\]-plants the carboxylation (addition of\[C{{O}_{2}}\]) of RuBp (Ribulose 1, 5 biphosphate) is catalysed by an enzyme rubisco to form a 3-carbon compound phosphoglyceric acid (the first stable product of \[{{C}_{3}}\]-plants). \[RuBP+C{{O}_{2}}\xrightarrow{\text{Rubisco}}\]3-phosphogl yceric acid Pyruvic acid is the end product of glycolysis. During glycolysis one molecule of glucose is breakdown into two molecules of pyruvic acid.
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