Auxin is a plant hormone in the stem tip. This plant hormone causes the plant to form leaves, it causes the plant to exhibit photo tropism, and it causes it to form other important functions. The photo above shows the tip of the stem, where auxin is produced. The leaves formed and the movement of the plant would be different if auxin was not present. Auxin is at the stem tip so it can be found at the top or on the different sides of a plant, it does not have to be limited to one area. All leafy plants have this hormone.
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