Question

Which of the following is not considered a primary limiting factor for the rate of photosynthesis?

• A. Light intensity
• B. Temperature
• C. Carbon dioxide concentration
• D. Oxygen concentration

Hint:

\[ \boxed{\text{Limiting factors → Light, CO}_2, \text{Temperature}} \] \[ \boxed{\text{O}_2 \rightarrow \text{photorespiration, not limiting factor}} \]

Answer 1

The Correct Option is D

According to Blackman's law of limiting factors, the primary limiting factors for photosynthesis are light intensity, carbon dioxide concentration, and temperature. Chlorophyll concentration is not a primary limiting factor under normal conditions because it is already present in sufficient amounts and does not typically restrict the overall rate of photosynthesis.