Relationship between photosynthesis and respiration Transitional Reasoning Download PDF

Questions

1. 1.

   A researcher places a green plant in a sealed, transparent chamber under a controlled light source and monitors the surrounding gas concentrations over several hours. At a specific light intensity, the net concentrations of both carbon dioxide and oxygen within the chamber remain completely constant over time. Based on the relationship between photosynthesis and cellular respiration, which statement correctly describes the metabolic state of the plant under these conditions?

   • A) The rate of oxygen produced by photolysis in the chloroplasts equals the rate of oxygen consumed by the mitochondrial electron transport chain.
   • B) Cellular respiration is completely halted because the ATP produced in the chloroplasts fulfills all metabolic energy needs of the cell.
   • C) Photosynthetic carbon fixation has stopped because the Calvin cycle requires a net surplus of atmospheric oxygen to operate.
   • D) The plant switches to anaerobic fermentation because oxygen cannot diffuse between adjacent organelle membranes within the same cell.