Question

A plant is exposed to an optimum amount of carbon dioxide, with a limited light intensity. As the intensity of light increases, the rate of photosynthesis increases. Which of the following act as limiting factor in above-given case?

• A. Light
• B. Carbon dioxide
• C. Temperature
• D. All of the above

Answer 1

The correct option is A Light

Blackman's law is applicable to photosynthesis. It states that a process is controlled by many factors but the rate of photosynthesis will depend on the factor which is present in limited quantity. If all factors are present but light intensity is low then light will become the limiting factor and rate of photosynthesis will depend only on light, the limiting factor. The level of carbon dioxide is maintained constant and so light is the limiting factor.

Thus, the correct answer is option A.