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The substrate for photorespiration is

(a) serine Your answer
(b) glycolate Correct
(c) glycine Your answer
(d) phosphoglyceric acid Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Glycolate (from phosphoglycolate) is the substrate of photorespiration. It moves from the chloroplast to the peroxisome, where it is oxidised.

Why the other options are wrong

(a) · your answer Serine is formed later in the pathway, in the mitochondrion.
(c) · your answer Glycine is an intermediate formed from glycolate in the peroxisome.
(d) · your answer PGA is a product of the oxygenation step, not the substrate of the pathway.

NCERT point: In photorespiration, RuBP combines with O₂ to form one PGA and one phosphoglycolate; no sugar and no ATP are made.

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