Leaves and the EnvironmentLight effectsSun and shade leaves. The architecture of leaves changes depending upon the light intensity in which they grow, even on the same plant. Sun leaves usually are smaller and thicker with more and better defined palisade cells, and more chloroplasts. They frequently have more hairs as well. Sun leaves rarely have chloroplasts in their epidermal cells, but chloroplasts are common in the epidermises of shade leaves. Day length. The presence or absence of light (as well as particular wavelengths) influences the production of plant hormones and the development of plant organs. For example, leaves do not develop normally in the dark, and chloroplasts don't turn green unless exposed to light; the tissues are yellow and said to be etiolated. The duration of the light also influences the shape of many kinds
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