Question

What could be the limiting factor/s in region A ?

• A. Light
• B. Concentration of $C{O}_2$.
• C. Both A and B
• D. None of the above

Answer 1

The correct option is C Both A and B

The rate of photosynthesis increases linearly with increasing light intensity. Gradually the rate falls and at a certain light intensity the rate of photosynthesis stay constant. Here, a rise in light intensity has no affect on the rate of photosynthesis as the other factors such as temperature and carbon dioxide become limiting. So, the limiting factors in region A can be light as well as the concentration of CO${}_2$.

So, the correct answer is option B.