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NEET2026BiologyChapterActual

Which of the following pairs of plant growth regulators consists exclusively of synthetic compounds?

Options

  1. AIAA and Zeatin
  2. BNAA and Kinetin
  3. CIBA and GA ₃
  4. DABA and 2,4-D

Correct answer

B. NAA and Kinetin

Step-by-step solution

Plant growth regulators can be broadly classified into natural and synthetic compounds based on their occurrence. IAA (Indole-3-acetic acid) and IBA (Indole-3-butyric acid) are natural auxins isolated from plants. Zeatin is a natural cytokinin isolated from corn kernels and coconut milk. GA ₃ (Gibberellic acid) and ABA (Abscisic acid) are also naturally occurring plant growth regulators. NAA (Naphthaleneacetic acid) and 2,4-D (2,4-Dichlorophenoxyacetic acid) are synthetic auxins. Kinetin is a modified form of adeni

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