One of the synthetic auxin is

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(D) Auxins are plant hormones that promote growth. They are categorized into natural and synthetic auxins.$IAA$ (Indole$-3-$acetic acid) and $IBA$ (In

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$NAA$

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(D) Auxins are plant hormones that promote growth. They are categorized into natural and synthetic auxins.$IAA$ (Indole$-3-$acetic acid) and $IBA$ (Indole$-3-$butyric acid) are natural auxins.$NAA$ (Naphthalene acetic acid) and $2,4-D$ ($2$,$4$-dichlorophenoxyacetic acid) are synthetic auxins.$GA$ (Gibberellic acid) is a different class of plant growth regulator,not an auxin.Therefore,$NAA$ is the correct synthetic auxin among the given options.

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