Question

Find the odd one out- a)IAA b)2,4-D c)NAA d)IBA
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Answer 1

OK I will find the answer then I tell

Answer 2

2,4-D (b) and NAA (c) are the odd options as they are synthetic auxins.

• Auxins are plant growth regulating hormones produced by growing apices of shoots and roots. Their important function is promoting apical dominance (inhibiting the growth of lateral buds).
• IAA and IBA are natural auxins that are isolated from plants. They play a role in plant propagation where they help to initiate rooting in stem cuttings. They also promote flowering.
• 2,4-Dichlorophenoxyacetate and Naphthalene acetic acid are synthetic auxins that are primarily used as herbicides and pesticides. For example, 2,4-D kills dicotyledonous weeds and does not affect monocotyledonous plants.
• Synthetic auxins are widely used by farmers and gardeners in weeding processes.