Question

$NA{D}^{+}$ is reduced in photorespiration inside

• A. Mitochondria
• B. Mitochondria and peroxisome
• C. Mitochondria and chloroplasts
• D. Chloroplasts and peroxisomes.

Answer 1

Answer: (C)

Mitochondria and chloroplasts

In photorespiration, the glycine is transported out of peroxisomes into mitochondria, where two molecules of glycine interact to form one molecule each of serine, CO${}_2$, NH${}_3$.

2 Glycine + H${}_2$O + NAD${}^{+}\to$ Serine + CO${}_2$+ NH${}_3$ + NADH

When glyceric acid finally enters the chloroplast where it is phosphorylated to 3 PGA which enters in C${}_3$ cycle, where during the reduction process, NAD${}^{+}$ is reduced.

Hence, the correct answer is 'Mitochondria and chloroplasts'.