Multiple choice

Choose the odd one from the following.

  1. IAA

  2. AA

  3. IBA

  4. 2 - 4, D
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

IAA (Indole-3-acetic acid), IBA (Indole-3-butyric acid), and 2,4-D (2,4-dichlorophenoxyacetic acid) are all auxins or auxin-like compounds. AA is not a standard plant hormone abbreviation in this context - it likely refers to ascorbic acid or amino acids, making it the odd one out among these plant growth regulators.

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