Correct option is B
Explanation-
Photorespiration involves chloroplasts, peroxisomes, and mitochondria. Here's the actual sequence:
(i) Rubisco fixes O₂ (instead of CO₂) → produces 3-phosphoglycerate (3-PGA) and 2-phosphoglycolate.
(ii) 2-phosphoglycolate is converted to glycolate in the chloroplast, which exits to the peroxisome.
(iii) In peroxisomes: glycolate → glyoxylate → glycine
(iv) Glycine moves to mitochondria where 2 glycine → 1 serine + CO₂ + NH₃
(v) Serine returns to peroxisome → glycerate → goes back to chloroplast
Analyzing each statement:
Statement A - The first two-carbon (2C) compound synthesized by the action of Rubisco in the chloroplast is glycolate - INCORRECT
Rubisco forms 2-phosphoglycolate, not directly glycolate. Glycolate is formed after dephosphorylation of 2-phosphoglycolate.
Statement B - Glycolate exits the chloroplast and enters peroxisomes - CORRECT
This is the normal transport route in photorespiration.
Statement C - Glycolate that is synthesized during C₂ cycle enters the chloroplast from mitochondria - INCORRECT
Glycolate does not come from mitochondria. It is formed in chloroplast, moves to peroxisome, then processed via glycine/serine in mitochondria. Mitochondria handle glycine → serine, not glycolate synthesis.
Statement D - Glycine is transported from peroxisomes to mitochondria - CORRECT
This is a key step in photorespiration: peroxisomes produce glycine, which is moved to mitochondria.
Final Answer:
Incorrect statements: A and C
Correct answer - Option b - A and C only
