Photorespiration in C3 plants start fromA. PhosphoglycerateB. Glucose-6-phosphateC. GlycerateD. Glycine

Photorespiration in C3 plants starts from:

D. Glycine

Here's a brief explanation:

Photorespiration is a process that occurs in C3 plants when the enzyme RuBisCO oxygenates RuBP (ribulose-1,5-bisphosphate), leading to the production of a two-carbon molecule called phosphoglycolate and a three-carbon molecule called 3-phosphoglycerate. Phosphoglycolate is subsequently converted into glycolate, which is then transported to the peroxisome, where it is oxidized to glyoxylate and then transaminated to form glycine.

Glycine is then transported to the mitochondria, where two molecules of glycine are converted into one molecule of serine, releasing CO2 and ammonia. This sequence of reactions constitutes the photorespiratory pathway, beginning with glycine in the mitochondria.

Therefore, glycine is a key intermediate in the photorespiration pathway of C3 plants.