If a plant is subjected to very high light intensities.
there is exponential increase in the rate of photosynthesis
there is moderate increase in the rate of photosynthesis
photosynthetic rate remains same and chlorophyll is destroyed
there is decrease in photosynthetic rate due to breakdown of chlorophyll.
Increase in incident light beyond saturation point causes the breakdown of chlorophyll and therefore there is decrease in the rate of photosynthesis.