Which outcome limits plant productivity when C4 photosynthesis is inhibited by a specific enzyme malfunction?

💡 Explanation

When a malfunctioning enzyme inhibits the C4 pathway, CO2 fixation efficiency decreases because the plant reverts to the less efficient C3 pathway exhibiting greater photorespiration under heat stress. Therefore, increased photorespiration limits productivity, rather than water loss, pigment reduction, or root function, which aren't directly tied C4 pathway inhibition.

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