Another natural plant growth hormone source is yeast, which produces the auxin indole-3-acetic acid. Auxins alone or in combination with other hormones are responsible for many aspects of plant growth. However, in other species of plants, ethylene inhibits this growth. Plant hormones control all aspects of plant growth and development, from embryogenesis, the regulation of organ size, pathogen defense, stress tolerance and through to reproductive development. Answer. Plant Growth Regulators are defined as small, simple chemicals produced naturally by plants to regulate their growth and development. No matter the type of plant, ethylene is best known for promoting the ripening of fruit. 2.Promotion of cell division- cytokinins. Sprouted seed teas (SSTs) are starting to gain popularity amongst probiotic farmers. 4. Unlike in animals (in which hormone production is restricted to specialized glands ) each plant cell is capable of producing hormones. October 15, 2019 Habeez Nandy. IAA in particular: IAA in particular: Activates the differentiation of vascular tissue in the shoot apex and in calluses; initiates division of the vascular cambium in the spring; promotes growth of vascular tissue in healing of wounds. Cytokinins (CKs) are a class of hormones that stimulate cell division and cell differentiation, shoot initiation and growth in plants. Yeast extracts are probably on the list of unlisted ingredients in products that make your garden blast off. 1.Growth of the stem - Gibberillins.

For instance, auxins are the hormones responsible for phototropism, the growth of a plant toward the light. Characteristics Plant Growth Regulators can be of a diverse chemical composition such as gases (ethylene), terpenes (gibberellic acid) or carotenoid derivates (abscisic acid). Gibberellic acid, a growth hormone, is responsible for the growth of stems in many plants; specifically, this paper highlights GA’s role in pea plants. These plant hormones are also used to change the sex expression of certain plants, allowing growers to manipulate their crop. Gibberellins They, to a greater extent than the auxins, control cell division and overall plant growth. Phototropism results from the rapid elongation of cells on the dark side of the plant, which causes the plant to bend in the opposite direction. Name the plant hormones responsible for the following: (i)Growth of stem (ii)Promotion cell division (iii)Inhibition of growth (iv)Elongation of cells. The primary function of the auxin hormones is to elongate plant cells in the stem.

Elongation of cells - Auxins.

3.Inhibition of growth - Abscissic acid in seed, Auxins in lateral buds .

Gregor Mendel, the earliest geneticist we know of, formed the theory of heredity, in which he described genes (traits) passed down from one generation to another.