Question

Choose the correct labelling for given figure.

• A. D - 10% of total sunlight, E - Compensation point
• B. A - Achieved at high light intensity
• C. D - Saturation point , E - Maximum photosynthesis
• D. A - Light saturation at 10% of total sunlight

Answer 1

The correct option is C D - Saturation point , E - Maximum photosynthesis

Graph of light intensity and the rate of photosynthesis

D - Saturation point at 10% of total sunlight, E - Maximum photosynthesis. D and E represent the point at which the maximum saturation of light has been reached which the plant requires for photosynthesis.
A - Photosynthesis increases linearly with light intensity at low light intensities.
B - The rate of increase of photosynthesis slows down because other factors become limiting.
C - Light saturation has already occurred.

Compensation point is the light intensity at which the rate of photosynthesis exactly matches the rate of cellular respiration. It occurs at low light intensities.