In many dicots, the first pair of leaves that emerge from the soil after seed germination are completely unlike all the rest of the leaves that form on that plant. In such plants, these leaves are:

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The first pair of leaves that emerge from the soil after seed germination in dicots are known as cotyledons and are completely unlike all the rest of the leaves that form on the plant. They are derived from the embryonic seed and are usually somewhat round and fleshy, with a different shape and size than the leaves that will grow later. Over time, the cotyledons elongate and turn green as they start to photosynthesize.

In Many Dicots, the First Pair of Leaves That Emerge