alleryBeyond the saturation point of light intensity, photosynthesis
AKeeps rising in direct proportion to light
BLevels off as another factor becomes limiting
CFalls sharply because chlorophyll bleaches
DDrops to zero immediately at saturation point
Answer & Solution
Correct answer: B. Levels off as another factor becomes limiting
1. Photosynthesis needs light, CO2, water and temperature in range.
2. Beyond saturation, chlorophyll cannot absorb more photons.
3. Another factor (often CO2) becomes the limiter.
4. So the rate levels off.
_Source: Selina Concise Biology Class 10, Ch on Photosynthesis (Mistral OCR'd PDF), section on limiting factors_
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