Auxins help primarily in influencing cell elongation and enlargement hence sometimes referred to as growth hormones. Actions of auxins are to stimulate or inhibit growth hence they are regarded as growth regulators. The most abundant natural auxin manufactured in plants is indoleacetic acid (IAA), IAA is secreted most abundantly in the tips of shoots, developing leaves, flowers, fruits, cambial cells and root tips. Auxins have been artificially synthesised. An example of a synthetic auxin is Dichlorophenoxy ethanoic acid (2,4-D).   The roles of auxins Phototropism of shoot: When light shines on one side of the shoot of a plant, the auxin on that side is reduced, and consequently the growth…