Which of the following is a plant hormone?

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Insulin

Thyroxin

Oestrogen

Cytokinin

answer is D.

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Detailed Solution

Originally thought to be substances that, when combined with auxins, cause callus differentiation and cell proliferation, cytokinins are now understood to be much more than that.
The apical region of cell development and leaf withering are both aided by cytokinin.
Cytokinins are essential for many stages of plant growth and development.
They were first identified as substances that, when combined with auxins, promote cell proliferation and cause callus differentiation to shoots.
Throughout the plant's life, cytokinins play a crucial role in controlling growth and development.
Insulin, Thyroxine and Oestrogen etc., are the secretions of the endocrine Glands in Human Beings.

Hence, option D is the correct answer.

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