Question

IBA is
A. Auxin
B. Gibberellin
C. Kinetin
D. None of the above

Answer 1

Above enlisted options are the plant hormones. The term IBA represents the term Indole-3-butyric acid. The plant hormone auxin is responsible for the elongation of cells which is present at the tip of the stem.

Complete answer:
Plant hormones can be defined as single molecules produced by plants which control all aspects of plant growth and development. The various classes of plant hormones are abscisic acid, auxins, gibberellins, cytokinin, ethylene, and many more. Gibberellins are also called Gas. The role of gibberellin is to elongate the cells in a plant during its development period. So, option B is wrong. Kinetin is a plant hormone that promotes cell division and is a type of cytokinin. So, option C is also wrong. IBA is a plant hormone that belongs to the auxin family. It is a white to light-yellow crystalline solid. IBA and other auxins are used to initiate root formation in vitro in plant tissue culture in a procedure called micropropagation. The process in which small samples of plants called explants are used and causing them to undergo growth of differentiated or undifferentiated cells is called micropropagation.

So, IBA belongs to the auxin family of plant hormones. Therefore, from all the options provided option A: auxin is the correct answer.

Note: The hormone IBA is used as an ingredient in many commercial horticultural plants rooting products. Plant hormones are also called phytohormones. IBA is not soluble in water completely, it is also available as salt which is soluble in water.