A) malic acid
B) oxaloacetic acid
C) 3-phosphoglyceric acid
D) phosphoglyceraldehyde
Correct Answer: C
Solution :
In \[{{\text{C}}_{3}}\] plants, the first stable product formed during dark reaction is 3-phosphoglyceric acid. Since, it is a 3-carbon compound hence, the pathway is referred as\[{{\text{C}}_{3}}\]pathway. Oxaloacetic acid (OAA) is the first stable compound in \[{{\text{C}}_{4}}\] plants. It is a 4C compound. This acid is converted to another 4C acid malic acid which enters into the chloroplast of bundle sheath cells. In \[{{\text{C}}_{3}}\] cycle, 3PGA is phosphorylated into 1, 3-diphosphoglyceric acid, which is reduced into 3-phosphoglyceraldehyde.
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