Illustrated page explaining the role of auxins in apical dominance.
Online Big Picture magazine on plants, articles and resources cover A level plant biology topics including photosynthesis and plant hormones.
Page of information on xerophytic plants and how they are adapted to the desert environment
Article on water movement through a plant
Animation on transport in phloem.
Lecture notes from a US college including plant anatomy and physiology (move down the page to find links)