Question

Which of the following is not naturally occurring plant hormone.
A) 2,4-D
B) GA2
C) Gibberellin
D) IAA

Answer 1

Hint:Plant hormones are the signal atoms, created inside plants, that happen in incredibly low fixations.

Complete Answer:
Plant hormones control all parts of plant development and advancement, from embryogenesis, the guideline of organ size, microorganism protection, stress resilience and through to the conceptual turn of events. Plant hormones in their natural form can be gathered into five classes of mixes: auxins, gibberellins, cytokinins, abscisic corrosive, and ethylene, every one of which is portrayed quickly underneath.
Auxins:- These are fundamentally development elevating substances that add to the prolongation of shoots, however at high fixations they can hinder development of parallel buds. Auxins are for the most part delivered in apical buds, youthful leaves, and creating seeds.
Gibberellins likewise advances the process of plant development. They are delivered in extremely youthful leaves, creating seeds, natural products, and roots. Gibberellins cause cell stretching, including shoot development, and are associated with guidelines of torpidity. Financially, gibberellins have been utilized to improve organic product size.
Cytokinins advance cell division. They are believed to be delivered in the roots and by youthful natural products.
Abscisic Acid is a development inhibitor. It controls the lethargy of buds and seeds and represses shoot development.
Ethylene: This is the main known vaporous plant hormone. Many plant organs orchestrate ethylene, and it moves promptly noticeable all around encompassing the tree.
Synthetic plant hormones are IBA and Cycocel, that mimic naturally occurring plant hormones, or they might be regular hormones that are separated from plant tissue, for example, IAA, 2,4-D also known as naphthalene acetic acid (NAA).

Hence the correct answer is option A.

Note: The compound 2,4- dichlorophenoxyacetic acid ir 2,4-D is a herbicide used to kill any dicot plant tissue. It is a synthetic auxin.