Question: 99 Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?
(1) Zeatin
(2) Abscisic Acid
(3) Indole-3-butyric Acid
(4) Gibberellic Acid
Answer: Option (4)
Explanation:
Gibberellic acid is a plant growth hormone that promotes stem elongation, flowering, and seed development.
In juvenile conifers, the reproductive phase is delayed due to a long juvenile period.
Spraying gibberellic acid accelerates physiological growth processes and induces early flowering and cone formation.
This hastening of reproductive maturity leads to early seed production in conifers.
Hence, gibberellic acid is used to shorten the juvenile phase in coniferous plants.