Which circumstance suppresses the C4 carbon fixation pathway?

💡 Explanation

Suppressed C4 carbon fixation occurs with elevated mesophyll CO2 concentration because this reduces reliance on PEP carboxylase and the spatial separation mechanism characteristic of C4; therefore C3 pathways become more efficient, rather than being bypassed by photosynthesis.

• Which acoustic adaptation enables echolocating bats to discriminate prey texture?
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• Which process reduces plant available phosphorous uptake during transpiration?
• Which outcome minimizes photorespiration under high-temperature stress in C4 plants reliant on rubisco?
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