Trees need leaves primarily because of photosynthesis and respiration. Photosynthesis is the process by which carbon dioxide is converted into nutrients that are needed by plants for survival. More »

Leaves fall from trees because the tree begins to prepare itself for the winter season. Trees seal the spots where the leaves are attached, cutting off water to the leaves. The leaves then change color and fall from the ... More »

Trees such as oaks and maples can be identified by the shapes of their leaves. Maple leaves are usually lobed and palmate, which means the midribs of the lobes radiate out from a single point. More »

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Trees grow as a result of the formation and division of cells in meristems and by conducting photosynthesis and absorbing nutrients and water through their root systems. Cells in the cambium layer divide and grow to form... More »

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Willow trees can be differentiated by their leaves, their form, their bark and their catkins. Willows are mostly deciduous trees, which means they lose their leaves in the fall. Male and female flowers are found on diffe... More »

According to Reference.com, palmettos are dwarf palm trees that have fan-like leaves and are common in the Southeastern United States. Most palm trees that are considered palmettos fall into the genus Sabal, and the name... More »

Identify sassafras trees by examining the leaves, bark, tree height, flowers, fruit, scent and geographic location of the trees. You need a field guide for comparison. Sassafras trees are usually easy to identify by taki... More »