The rosette habit of cabbage can be changed by applicaton of

Options

A. GA
B. NAA
C. ABA
D. Cytokinins

Answer

### Step-by-Step Solution:

1. **Understanding Rosette Habit**: The rosette habit refers to a growth form where leaves are arranged in a circular pattern close to the ground. In cabbage, this results in a compact growth with short internodes.

2. **Identifying the Role of Hormones**: To change the rosette habit of cabbage, we need to look for a hormone that can induce changes in plant growth, particularly one that promotes elongation.

3. **Recognizing Gibberellic Acid**: Gibberellic acid (GA) is a plant hormone known for promoting stem elongation and is responsible for the bolting effect in plants. Bolting is the rapid elongation of the stem, which can transform a rosette plant into a more upright form.

4. **Mechanism of Action**: When gibberellic acid is applied, it causes the internodes (the segments of the stem between the leaves) to elongate. This elongation disrupts the compact rosette form, allowing the plant to grow taller.

5. **Comparing Other Hormones**:
- NAA (Naphthalene Acetic Acid) is a synthetic auxin that promotes root growth and is not effective for elongation.
- Abscisic Acid is a growth inhibitor, which does not promote elongation.
- Cytokinins promote cell division and differentiation but do not specifically induce stem elongation.

6. **Conclusion**: The application of gibberellic acid is the most effective way to change the rosette habit of cabbage by promoting stem elongation.

### Final Answer:
The rosette habit of cabbage can be changed by the application of **gibberellic acid**.

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