The hormone synthesised by root and transported to shoot apex is

Options

A. Gibberellin
B. ABA
C. Cytokinin
D. Auxin.

Answer

**Step-by-Step Solution:**

1. **Identify the Hormones**: The question asks for a specific hormone that is synthesized in the roots and transported to the shoot apex. The options given are gibberellins, abscisic acid, cytokinins, and auxins.

2. **Analyze Each Hormone**:
- **Gibberellins**: These hormones are primarily synthesized in young tissues of the plant, such as seeds and young leaves, and can be transported through both phloem and xylem. They are not specifically synthesized in the roots.
- **Abscisic Acid (ABA)**: This hormone is involved in stress responses and is synthesized in various parts of the plant, including leaves and roots. However, it is not primarily known for being synthesized in the roots and transported to the shoot apex.
- **Cytokinins**: These hormones are primarily synthesized in the roots and are responsible for promoting cell division and growth. They are transported to the shoot apex via the xylem.
- **Auxins**: Auxins are mainly synthesized in the shoot tips (apical meristems) and are transported downwards to promote growth in other parts of the plant.

3. **Conclusion**: Based on the analysis, the hormone that is synthesized in the roots and transported to the shoot apex is **cytokinins**.

4. **Final Answer**: The hormone synthesized by the roots and transported to the shoot apex is **cytokinins**.

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