On a very hot summer day, the greatest level of O₂ production (photorespiration) by a C₃ plant would likely take place A) 3 hours after nightfall. B) 3 hours before sunrise. C) in midafternoon. D) in midmorning. E) at midnight.

Question

Quizplus · Accepted Answer

Photorespiration is a process that occurs when the stomata, small openings on the leaves, close to prevent excessive water loss during hot and dry conditions. This leads to the build-up of oxygen and the depletion of carbon dioxide within the leaf, which triggers photorespiration. Since the hottest part of the day is midafternoon, this is when the greatest level of photorespiration would likely take place. Therefore, the correct answer is C.

On a Very Hot Summer Day, the Greatest Level of O2

On a Very Hot Summer Day, the Greatest Level of O₂