Multiple Choice
What organelle recycles carbon from phosphoglycolate during photorespiration in plant cells?
1
views
9. Photosynthesis
Photorespiration
Multiple Choice
Plants are more likely to use Photorespiration instead of the Calvin Cycle when:
A
Stomata remain open and CO2 concentrations within the plant are high
B
Stomata remain closed and O2 concentrations within the plant are high
C
Glucose concentrations within the plant are low
D
CO2 binds to Rubisco
Verified step by step guidance1
Understand the process of photorespiration: Photorespiration occurs when the enzyme Rubisco oxygenates RuBP, leading to a wasteful pathway that consumes energy and releases CO2, instead of fixing carbon in the Calvin Cycle.
Identify the conditions that favor photorespiration: Photorespiration is more likely to occur when the concentration of O2 is high and CO2 is low within the plant cells.
Consider the role of stomata: Stomata are small openings on the surface of leaves that allow gas exchange. When stomata are closed, CO2 cannot enter the leaf, and O2 cannot exit, leading to higher internal O2 concentrations.
Analyze the given options: The condition 'Stomata remain closed and O2 concentrations within the plant are high' aligns with the conditions that favor photorespiration, as closed stomata prevent CO2 from entering and increase O2 concentration.
Conclude why the correct answer is 'Stomata remain closed and O2 concentrations within the plant are high': This condition leads to a higher likelihood of photorespiration because Rubisco will bind to O2 instead of CO2, initiating the photorespiratory pathway.
Related Videos
Related Practice
