What structural or internal factors in plants affect the rate of transpiration? I missed the notes on this in lecture and haven't been able to find it anywhere, even better if you know the specific ones on the WJEC spec.
All I can think about right now is: Waxy cuticles on leaves, number , size and the position of the stomata and the number of leaves. You also have conditions that can affect the rate of transpiration, such as light, temperature, humidity, wind and the availability of water. I do the OCR spec, I hope that this has helped somewhat.
Humidity decreases transpiration - creates smaller concentration gradient. Wind speed increases it - large concentration gradient of water between inside and outside of the leaf. Temperature increases it - stomata open for gas exchange. Light increases it - photosynthesis are open for carbon dioxide intake. I do the WJEC spec, hope I helped.