SACE Stage 2 Agricultural Production Practice Questions - SACE Stage 2 Agricultural Production External Assessment Exam

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During periods of high daytime temperatures and drought stress, why do C3 crops experience a significant decline in photosynthetic efficiency compared to C4 crops?

RuBisCO oxygenase activity increases relative to carboxylase activity, leading to photorespiration Stomata open wider to increase evaporative cooling, depleting cellular ATP stores Chlorophyll b degrades rapidly, preventing light absorption in photosystem II PEP carboxylase becomes irreversibly denatured at temperatures above 25°C

Correct Answer:

RuBisCO oxygenase activity increases relative to carboxylase activity, leading to photorespiration

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