Auxin - GCSE Biology Definition
Reviewed by: Lára Marie McIvor
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Auxin is a plant hormone that controls the growth and development of plants by regulating cell elongation. In GCSE Biology, students learn that auxins are involved in phototropism (growth towards light) and gravitropism or geotropism (growth in response to gravity). Auxins are mainly produced in the tips of shoots and roots and move to other parts of the plant to influence growth by promoting cell division and differentiation. They promote cell elongation in shoots and inhibit it in roots, helping plants respond to their environment and grow in the right direction.
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