Multiple choice

Which of the following are the examples of natural plant growth hormones?

i. IAA ii. GA3 iii. Zeatin iv. 2,4-D v. IBA

  1. i, ii and iii

  2. i, iv and v

  3. ii and iv

  4. iii and v

  5. iii, iv and v
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A Correct answer
Explanation

All are natural plant growth hormones. Indole-3-acetic acid (IAA) is the most common, naturally-occurring, natural plant growth regulator hormone of the auxin class. Gibberellic acid (GA3) is an important natural plant growth regulator that is used commercially to increase plant growth and crop yields. Zeatin is a member of the plant growth regulator hormone family known as cytokinins.  

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