Which outcome occurs when a C4 plant experiences prolonged drought conditions impacting CO2 uptake?

💡 Explanation

During drought, stomata close, limiting CO2 diffusion, restricting initial CO2 fixation by PEP carboxylase in mesophyll cells and reducing the production of oxaloacetate. Therefore less oxaloacetate is produced, rather than activating CAM which is for other species, affecting malate flow while CO2 is adequate, and photorespiration reduction through C4 which requires sufficient CO2.

• Which outcome occurs when a rapidly growing C4 plant experiences prolonged magnesium deficiency?
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• Which physical outcome results under conditions that limit transpiration from plant leaves?