Question:
Young fruits are the site for synthesis of
Young fruits are the site for synthesis of
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Seedless fruits often need synthetic Auxin (IAA) or GA because they lack the natural "seed factory" that produces these hormones.
Updated On: Aug 13, 2026
- IAA
- GA
- Cytokinin
- Ethylene
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Plant hormones (Phytohormones) are synthesized in specific regions of high metabolic activity. Developing tissues such as shoot tips, young leaves, and developing seeds/fruits are primary metabolic sinks and hormone synthesis centers.
Step 2: Detailed Explanation:
Indole-3-Acetic Acid (IAA) is the most common natural auxin found in plants. Auxins are crucial for fruit set and subsequent fruit enlargement.
Immediately after fertilization, the developing embryo and the surrounding tissues of the young fruit become high-intensity sites for IAA biosynthesis. This high concentration of IAA is necessary for two main reasons:
1. Prevention of Abscission: It keeps the young fruit attached to the mother plant by preventing the formation of an abscission layer in the pedicel.
2. Cell Growth: It stimulates the cell division and cell enlargement in the ovary wall (pericarp), which leads to the growth of the fruit.
While Gibberellins (GA) and Cytokinins are also found in developing fruits and play roles in seed development and cell division, IAA is specifically recognized in horticultural science as the primary hormone synthesized by the young fruit itself to drive initial development. This is why exogenous application of synthetic auxins is used in many crops to induce parthenocarpy (seedless fruit) or prevent early fruit drop.
Step 3: Final Answer:
The primary hormone synthesized in young, developing fruits is IAA.
Plant hormones (Phytohormones) are synthesized in specific regions of high metabolic activity. Developing tissues such as shoot tips, young leaves, and developing seeds/fruits are primary metabolic sinks and hormone synthesis centers.
Step 2: Detailed Explanation:
Indole-3-Acetic Acid (IAA) is the most common natural auxin found in plants. Auxins are crucial for fruit set and subsequent fruit enlargement.
Immediately after fertilization, the developing embryo and the surrounding tissues of the young fruit become high-intensity sites for IAA biosynthesis. This high concentration of IAA is necessary for two main reasons:
1. Prevention of Abscission: It keeps the young fruit attached to the mother plant by preventing the formation of an abscission layer in the pedicel.
2. Cell Growth: It stimulates the cell division and cell enlargement in the ovary wall (pericarp), which leads to the growth of the fruit.
While Gibberellins (GA) and Cytokinins are also found in developing fruits and play roles in seed development and cell division, IAA is specifically recognized in horticultural science as the primary hormone synthesized by the young fruit itself to drive initial development. This is why exogenous application of synthetic auxins is used in many crops to induce parthenocarpy (seedless fruit) or prevent early fruit drop.
Step 3: Final Answer:
The primary hormone synthesized in young, developing fruits is IAA.
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