An excess of carbon dioxide (CO2) in a chloroplast makes conditions there more acidic. Such a change can cause protein molecules in cells to change shape and stop functioning. Which change is most likely to happen if a chloroplast contains too much CO2?
A. An increase in the amount of CO2 that the cell can absorb
B. A decrease in the formation of H2O in thylakoids
C. An increase in the amount of O2 that the cell can absorb
D. A decrease in the formation of NADPH by the light reactions

In excess CO₂ conditions, chloroplasts experience increased acidity, adversely affecting proteins needed for photosynthesis. This leads to a decrease in the formation of NADPH by the light reactions. Therefore, the correct answer is D.
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Answered by Anonymous | 2025-07-07

An excess of carbon dioxide in chloroplasts can increase acidity, affecting protein function and leading to a decrease in NADPH formation during the light reactions of photosynthesis. This disrupts the processes necessary for synthesizing sugars in the Calvin cycle. Therefore, the most likely consequence is a decrease in NADPH production. ;

Answered by GinnyAnswer | 2025-07-07