Other
Biology 101: Leaves: Structure Promotes Function
Discusses leaf anatomy and relates this discussion to the photosynthesis function of the leaf.
CK-12 Foundation
Ck 12: Biology: Leaves
[Free Registration/Login may be required to access all resource tools.] Discusses different types of leaves and seasonal changes in leaves.
Science Made Simple
Science Made Simple: Why Leaves Change Color
This is a site that offers answers to some often hard to answer questions such as why do leaves change colors. Provides an easy to understand answer to the question along with a section that students can read on their own, a puzzle,...