Photorespiration
A)may be an evolutionary relic from when atmospheric O₂ levels were low.
B)is of benefit to the plant since it breaks down rubisco.
C)is attributable to high CO₂ levels.
D)produces glucose.

Question

Quizplus · Accepted Answer

Photorespiration is believed to be an evolutionary relic from a time when atmospheric oxygen levels were low. Rubisco, the enzyme responsible for photosynthesis, can also bind with oxygen, leading to the wasteful process of photorespiration in the presence of high levels of oxygen.