Which statement about plant hormones is NOT true?

A. Responses to plant hormones may be observed in nearly any part of a plant.
B. Plant hormones include at least one form that is a gas.
C. Each naturally occurring hormone has a specific chemical structure.
D. All known growth regulators of plants are chemicals produced naturally in plants.
E. Hormones are among the principal internal regulators of plant growth.


Answer: D

Biology & Microbiology

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