Question

Incorrect statement is

• A. Except for the plants in shade or in dense forests, light is a limiting factor for photosynthesis
• B. Internal factor of photosynthesis and respiration are dependent on the genetic predisposition and the growth of the plant
• C. At any point, the rate of process is determined by the factor available at sub optimum levels
• D. C3 plants show saturation at 460 ppm CO2 while C4 plants responds to increased CO2 concentration and show saturation beyond 360 ppm

Answer 1

The correct option is A Except for the plants in shade or in dense forests, light is a limiting factor for photosynthesis

There is a linear relationship between incident light and CO${}_2$ fixation rates at low light intensities. At higher light intensities, gradually the rate does not show further increase as other factors become limiting. What is interesting to note is that light saturation occurs at 10 percent of the full sunlight. Hence, except for plants in shade or in dense forests, light is rarely a limiting factor in nature.

So, the correct option is 'Except for the plants in shade or in dense forests, light is a limiting factor for photosynthesis'.