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Biology Question 106 – NEET-UG 2023

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Which hormone promotes internode/petiole elongation in deep water rice?

Plants adapt to environmental stresses like deep water conditions through specific hormonal responses.

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Ninja Strategy•Specific Adaptation Recall

Recall the specific hormonal mechanism by which deep water rice adapts to submergence, which is a well-known role of ethylene.

Step 1: Identify the Plant Adaptation✦ Active

The question describes a specific adaptation in deep water rice: internode/petiole elongation. This is a survival mechanism that allows the plant to keep its photosynthetic parts above the water surface when submerged.

Step 2: Recall Hormonal Regulation of Submergence Response○ Expand

Ethylene is a plant hormone that accumulates in submerged plant tissues. This accumulation triggers a rapid elongation of internodes and petioles in deep water rice, enabling the plant to grow quickly and reach the water surface for gas exchange.

💡 Teacher's Secret Hint

Ethylene is often associated with stress responses and senescence, but it also plays a crucial role in adaptive growth in aquatic environments.

Step 3: Evaluate the Options○ Expand

1. GA3 (Gibberellic acid) promotes stem elongation, but ethylene is the primary and more specific trigger for the rapid, adaptive elongation in deep water rice under submerged conditions. 2. Kinetin (a cytokinin) is primarily involved in cell division and differentiation. 3. Ethylene is the correct hormone responsible for promoting internode/petiole elongation in deep water rice as an adaptation to submergence. 4. 2, 4-D (a synthetic auxin) is involved in cell elongation and differentiation but is not specifically known for this adaptive response in deep water rice.

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