Question

if the leaves of a geranium plant receive an adequate supply of raw materials, which graph below shows how the rate of photosynthesis is related to increasing light intensity received by the plant?

Explanation:

At low light intensities, the rate of photosynthesis increases with increasing light intensity. But there comes a point where other factors (like enzyme - saturation, CO₂ availability etc.) limit further increase, and the rate of photosynthesis levels off.

Answer:

D.