which of these plant hormones is not typically considered a growth-promoting substance?
1. Indole acetic acid (IAA)
2. Gibberellic acid (GA)
3. Abcisic acid (ABA)
4. Ethylene (ET)
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which of these plant hormones is not typically considered a growth-promoting substance?
1. Indole acetic acid (IAA)
2. Gibberellic acid (GA)
3. Abcisic acid (ABA)
4. Ethylene (ET)