Leaves: This week the students learned that a leaf is one of the most important parts of a plant. They discovered that leaves produce food for the plant through a process called photosynthesis, and that leaves of different plants vary widely in size, shape and color. Also, the children learned the life cycle of a leaf and why leaves change color in the fall. They discovered the different parts of a leaf like: veins, blade, midrib, petiole and stipule.