Which one of the following is a plant hormone ?

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Which one of the following is a plant hormone ?

Oestrogen
Cytokinin
Insulin
Thyroxin
This question was previously asked in
UPSC CISF-AC-EXE – 2021
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Cytokinin is one of the major classes of plant hormones. Plant hormones (or phytohormones) are signaling molecules produced within plants that occur in extremely low concentrations. Hormones regulate various aspects of plant growth and development. Oestrogen, Insulin, and Thyroxin are animal hormones.
Cytokinins are a group of plant hormones that promote cell division (cytokinesis) in plant roots and shoots. They are involved in various processes such as cell growth, differentiation, apical dominance, and delaying senescence (aging) of leaves.
Major classes of plant hormones include auxins, gibberellins, cytokinins, abscisic acid (ABA), and ethylene. These hormones interact with each other in complex ways to regulate plant development. Oestrogen is a primary female sex hormone in animals. Insulin is a peptide hormone produced by the pancreas that regulates blood sugar levels in animals. Thyroxin is a thyroid hormone produced by the thyroid gland in animals that regulates metabolism.

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