Photosynthesis Question 93
93. The substrate for photorespiration is
[1989]
(a) Phosphoglyceric acid
(b) Glycolate
(c) Serine
(d) Glycine
Show Answer
Answer : b
Hints & Solution
(b) Light dependent uptake of $O_2$ and release of $CO_2$ in $C_3$ photosynthetic cell is called photorespiration. Glycolate (glycolic acid) is the chief metabolite of photorespiration and also its substrate. Other important metabolities are the amino acids glycine and serine. But phosphoglyceric acid (PGA) is a lipid and is not substrate of photorespiration.
