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Biology Question 117 – NEET-UG 2023

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Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

Different phytohormones regulate various aspects of plant growth and development, including maturity and reproduction.

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Ninja Strategy•Function Recall and Exclusion

Recall the primary functions of each phytohormone and immediately exclude those with inhibitory or unrelated roles in reproductive maturity.

Step 1: Understand the Role of Phytohormones✦ Active

Phytohormones are chemical messengers that regulate various aspects of plant growth and development. Each class of phytohormone has specific functions.

Step 2: Recall Functions of Given Phytohormones○ Expand

Let's review the primary functions of the given phytohormones: * **Indole-3-butyric Acid (Auxin):** Primarily involved in cell elongation, root formation, and apical dominance. * **Gibberellic Acid (Gibberellin):** Promotes stem elongation, seed germination, and induces flowering and early seed production, especially in juvenile conifers. * **Zeatin (Cytokinin):** Promotes cell division, shoot growth, and delays senescence. * **Abscisic Acid (ABA):** Acts as a growth inhibitor, promotes dormancy, and stomatal closure during stress.

💡 Teacher's Secret Hint

Remember that different hormones can have synergistic or antagonistic effects depending on the plant and developmental stage.

Step 3: Identify the Correct Phytohormone○ Expand

Based on their known functions, Gibberellic Acid is the phytohormone that helps in hastening the maturity period and leading to early seed production in juvenile conifers. This effect is particularly significant in promoting early cone formation in conifers.

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