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Photorespiration in C3 plants is wasteful because
Ait uses water without producing sugar but releases pure ATP
Bit produces glucose at twice the normal rate
CRuBisCO fixes O₂ instead of CO₂; no ATP, no sugar, carbon lost as CO₂
Dit requires a separate enzyme rarely synthesised
Answer & Solution
Correct answer: C. RuBisCO fixes O₂ instead of CO₂; no ATP, no sugar, carbon lost as CO₂
Photorespiration starts when RuBisCO's oxygenase activity wins over its carboxylase activity (favoured by high O₂ and low CO₂ inside the leaf in heat). The resulting 2-carbon phosphoglycolate is processed at metabolic cost, and some carbon is released back as CO₂. C4 plants bypass this entirely.
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