NEET 2023 Phase 1 · BiologyPrevious Year Question
Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?
Answer: (B) Gibberellic Acid. Answer: (B) Gibberellic Acid.
- A.Indole-3-butyric Acid
- B.Gibberellic Acid✓
- C.Zeatin
- D.Abscisic Acid
Correct Answer
(B) Gibberellic Acid
Solution & Explanation
Answer: (B) Gibberellic Acid. Solution: Spraying juvenile conifers with gibberellins (GAs) hastens the maturity period, leading to early seed production. Indole-3-butyric acid is an auxin (rooting), zeatin is a cytokinin (cell division), and abscisic acid is a growth inhibitor, so none gives this early-maturity effect. NCERT: Ch 13, p.176, line ~41: "Spraying juvenile conifers with GAs hastens the maturity period".
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