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B
F.W. Went
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C
Thimann
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D
L. J. Audus
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Solution
The correct option is C Thimann A phytohormone is a plant growth regulator that modulates the formation of stems, leaves and flowers, as well as the development and ripening of fruit. The term includes endogenous and non-endogenous compounds (e.g., active compounds produced by bacteria on the leaf surface) as well as semi-synthetic and fully synthetic compounds. The term 'phytohormone' was coined by Thimann in 1948.