Q.
The graph below shows the relation between light intensity and the giving off and taking up of carbon dioxide by the leaves of a plant. Why is most carbon dioxide given off when the light intensity is zero units?
A) Because it is just the start of the experiment
B) Only respiration is taking place at this intensity of light
C) Only photosynthesis is taking place at this intensity of light
D) The rate of photosynthesis is equivalent to the rate of respiration
Explanation
Because only respiration is taking place at this intensity of light.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.