A sealed leaf chamber tracks CO2 uptake by a plant exposed to constant light.
The decline in slope after ~5 minutes is most likely due to:
- Acheck_circle
Decreasing CO2 in the chamber, making CO2 the limiting factor
- B
ATP poisoning of rubisco
- C
Light intensity decreasing over time
- D
Saturation of stomatal CO2 capacity
Explanation
As photosynthesis consumes CO2, [CO2] in the closed chamber falls, slowing the Calvin cycle and reducing CO2 uptake.