Which metabolic constraint limits productivity in C3 photosynthetic pathways under high temperatures?

💡 Explanation

When temperatures rise, photorespiration is favored in C3 plants because RuBisCO binds more readily to O2 than CO2 reducing net carbon fixation. Therefore photorespiration becomes dominant rather than CO2 fixation which requires high CO2 concentration and competitive binding affinity.

• Which mechanism enables arctic ground squirrels to survive tissue damage during hibernation cooling cycles?
• Which mechanism causes reduced photosynthetic rate when stomata close partially during midday heat stress?
• Which outcome reduces surface water availability near forests?
• Which outcome occurs when a migratory bird encounters unexpectedly high winds during nocturnal navigation?
• Which consequence results when aquaporin channel inhibition affects stomata?
• Which outcome limits plant productivity when C4 photosynthesis is inhibited by a specific enzyme malfunction?