Which of the following is not a plant harmone?

Auxin

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Gibberellins

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Cytokinin

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Adrenaline

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Solution

The correct option is D Adrenaline
Higher living organisms like plants and animals have various chemical substances in their bodies that help them transmit messages for the action of the different gland in their body. In plants, they are called phytohormones... Auxins, gibberellins and cytokinins are examples of pheromones.
Just in plant bodies, animals also have certain chemical substances in their bodies that are called hormones. Adrenaline is a hormone secreted from adrenaline gland.
So, option D " Adrenaline" is the correct answer.

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