The size of maple leaves varies depending on location; those growing at the tree's periphery tend to be smaller than those growing closer to the trunk; this allows leaves growing in the shade to have a larger surface area. This is an example of response to the environmental factor.
Leaves, like other plant parts, respond to environmental factors in order to adapt to the host tree's growth and development, as well as to contribute to reproductive processes and photosynthesis.
SUN LEAVES are leaves that grow on the outside of a tree and are found at the top of trees; they are thicker and smaller because they receive enough sunlight and air.
SHADE LEAVES are the leaves that grow closer to the trunk of trees; they are also found at the button of the trees, and they have more chlorophyll because the shade they receive from the sun leaves helps them to retain their green color pigment.
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