Which limitation arises when rising temperatures increase photorespiration rates relative to carbon fixation by Rubisco in C3 plants?

💡 Explanation

When temperatures rise, Rubisco favors oxygen binding over carbon dioxide, increasing photorespiration because the active site's kinetics are temperature-sensitive, resulting in the wasteful oxidation of RuBP and releasing carbon dioxide. Therefore, decreased photosynthetic efficiency and growth occur, rather than the alternatives which depend on entirely different biochemical pathways.

• Which consequence results when Rubisco malfunctions in C4 photosynthetic pathways?
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