Explain what does auxin control in plants? Is it show regulatory mechanism in both shoot and root growth of all plants?
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Auxin is an important plant hormone available in different forms including indole-3-acetic acid, indole-3-propionic acid, indole-3-butyric acid, phenylacetic acid, and 4-chloroindole-3-acetic acid. They all are responsible for various growth-related traits in almost all plants. The growth of any plant is based on cell number and cell growth. Hence the plant growth properties of these hormones could directly induce cell division, cell growth, and cell elongation. In addition, these endogenous auxins also play other roles especially in cell differentiation, apical dominance (is a condition in which the main shoot dominates and inhibits the growth of other parts of the plant), and phototropism (which is a phenomenon in which plant stem bends towards light).