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Which is the only naturally occurring auxin that shows physiological activity?
AAbscisic acid
BJasmonic acid
CGibberellic acid
DIndole acetic acid
Answer & Solution
Correct answer: D. Indole acetic acid
1. Auxins are the hormones mainly responsible for cell elongation in phototropism and gravitropism.
2. Many synthetic auxins exist and several are used as herbicides.
3. Among naturally occurring auxins, indole acetic acid is the only one that shows physiological activity.
4. Abscisic acid, jasmonic acid and gibberellic acid belong to other hormone groups altogether.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.6 Plant Sensory Systems and Responses_
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