All plants are affected by the radiation of the sun, and respond in various ways. Plants have stomata, tiny holes in their leaves, which in most healthy plants will close in sunlight to keep the water inside the plant from evaporating quickly. The surfaces of many plants also have special cells that shrink when the sun has been hitting the leaf for a long time. This causes the leaf to fold or wilt, and is also a mechanism to conserve water. A special class of plants called C4 or CAM plants, which includes corn, can flourish at higher rates of sunlight and heat than others.
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