Cell Division Plant Hormones include 6-BA, GA3, IAA, 2-IP etc. Cell Division Plant Hormones mainly have the effect of promoting cells division. Plant hormones (also known as phytohormones) are chemicals that regulate plant growth. Plant hormones are signal molecules produced within the plant, and occur in extremely low concentrations Hormones regulate cellular processes in targeted cells locally and, moved to other locations, in other functional parts of the plant. Plant hormones also determine the formation of flowers, stems, leaves, the sheddings of leavess, and the development and ripening of fruit. Plants, unlike animals, lack glands that produce and secrete hormones.