The diagram shows the effect of light intensity on the rate of transpiration from the upper and lower epidermis of a leaf. Other environmental factors were kept constant. What could explain the differences in transpiration rates from the two surfaces?

A. Higher light intensities are associated with higher temperatures.

B. The palisade mesophyll cells have fewer air spaces than the spongy mesophyll cells.

C. The upper epidermis has fewer stomata.

D. The upper epidermis is more exposed to light.

Transcribed Image Text:

lower epidermis upper epidermis Light intensity Rate of transpiration