Question

Which one of the following seldom act as a limiting factors in photosynthesis?

• A. Temperature
• B. Light
• C. Water
• D. $C{O}_2$

Answer 1

The correct option is C Water

There are 3 major limiting factors for photosynthesis. These are light intensity, temperature and carbon dioxide levels. These factor directly affect the rate of photosynthesis regardless of the level of the other factors. As sunlight enters the chlorophyll molecules, the rate of photosynthesis increases. At a certain point, the rate of photosynthesis does not increase with increase in the intensity of light. Optimum temperature is required for the photosynthesis, At very low or high temperatures, the enzymes cannot function properly. Hence, the rate of photosynthesis decreases. As the levels of carbon dioxide increases, the rate of photosynthesis increases. After attaining the maximum rate of photosynthesis, further increase in carbon dioxide levels does not increase the rate of photosynthesis. Other factors like water seldom act as limiting factor in photosynthesis.

Thus, the correct answer is 'Water.'