Which outcome occurs when persistent high temperatures inhibit the enzyme phosphoenolpyruvate carboxylase (PEPcase) in a C4 plant?

💡 Explanation

When PEPcase is inhibited by high temperature, C4 plants can no longer effectively concentrate CO2, leading to a relative deficit of CO2 near Rubisco, which normally prevents photorespiration. Therefore, photorespiration increases, rather than other effects dependent on independent mechanisms under different conditions.

• Which process limits oxygen uptake in fish gills if water flow becomes laminar?
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• Which mechanism causes rapid ATP depletion from active muscle tissue during intense cold exposure and shivering thermogenesis?
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• Which outcome occurs when a larval insect's prothoracic glands fail to produce ecdysone?
• Which developmental failure happens when ecdysone levels prematurely rise during larval-pupal transition?