Plant hormones are usually:

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(D) Plant hormones,also known as phytohormones,are chemical substances that regulate plant growth and development. They are diverse in their chemical

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Aromatic compounds

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(D) Plant hormones,also known as phytohormones,are chemical substances that regulate plant growth and development. They are diverse in their chemical structure. For example,$Auxins$ are indole compounds (aromatic),$Gibberellins$ are terpene derivatives,$Cytokinins$ are adenine derivatives (purines),$Abscisic$ $acid$ is a carotenoid derivative,and $Ethylene$ is a simple gaseous hydrocarbon. Among the given options,many plant hormones possess aromatic rings or are derived from aromatic precursors,making 'Aromatic compounds' the most chemically diverse and accurate classification for the majority of these regulators.

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