A growth hormone called auxin.
No.
Auxins
Growth Promoters with the plants Hormones (regulators)
Auxins
The class of hormones called "Auxins" have this affect on plants.
The following are the factors responsible for the proper growth of plants and seeds.sunlight/light(artificial)watersoilair (mainly co2)Growth hormones
somatomedins
Plant hormones are natural, created by the plants themselves. Plant growth regulators, on the other hand, are usually synthetic in nature. Both serve to help plants grow at low concentration, and both can damage plants at high concentrations.
Plants have a complex set of hormones which control their growth and these hormones are responsible for the 'directional' growth of the plant. Simply put, plants will grow up when they are put on their side because 'up' is where the sun is and plants will always grow towards the sun.
Growth hormones include plant hormones (natural & synthetic), but also include non-nutrient chemicals not found naturally in plants that when applied to plants, influence their growth and development. Therefore growth hormones are synthesized by plant and also we have the synthetic ones which include: are 2, 4-dichlorophenoxy acetic acid (2,4-D). 2, 4, 5-Trichlorophenoxy acetic acid (2,4, 5-T), 2-methyl 4 chlorophenoxyacetic acid (MCPA), 3-methyl 4 chlorophenoxyacetic acid.
The function of growth hormones is the stimulate growth in the body