Q7 / 180 · AIIMS 2019 (25 May) · Botany

Which of the following sets does not include all natural plant growth regulators?

  • A
    $\mathrm{GA}_3$, IAA, Zeatin
  • Correct answer
    B
    IAA, Kinetin, Zn
  • C
    $\mathrm{ABA}, \mathrm{GA}_7, \mathrm{GA}_3$
  • D
    $\mathrm{ABA}, \mathrm{GA}_3, \mathrm{IAA}$

Solution

Plant growth regulators are small, simple molecules of diverse chemical composition, which in low concentration regulate growth, differentiation and development by promoting or inhibiting the same. Kinetin is a synthetic cytokinin and zinc $(\mathrm{Zn})$ is not a natural plant growth regulator.

Hence, the correct answer is option: 'B'.

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