Question

Question 14
When $C{O}_2$ is added to PEP, the first stable product synthesised is
(a) pyruvate (b) glyceraldehyde-3-phosphate
(c) phosphoglycerate (d) oxaloacetate

Answer 1

(d) Oxaloacetate is a four carbon compound formed in $C_4$ cycle and is a first stable product, that is why such plants are called $C_4$ plants.
Rest of the options are incorrect as because
(a) Pyruvate is formed in glycolysis.
(b) Glyceraldehyde-3-phosphate is also an intermediate compound of glycolysis.
(c) Phosphoglycerate is also an intermediate compound of glycolysis.