Which of the following is not related to Gibberelin ?

Options

A. Bolting of rosette plants
B. Replacing long day requirement
C. Removal of genetic dwarfism
D. Bending movement of coleoptile

Answer

To determine which of the following options is not related to gibberellin, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Gibberellin**:
- Gibberellins are a class of plant hormones that promote growth and influence various developmental processes in plants.

2. **Analyzing the Options**:
- **Option 1: Bolting of Rosette Plants**:
- Bolting refers to the rapid elongation of internodes just before flowering. Gibberellins are known to promote this process, especially in rosette plants like pistia.
- **Conclusion**: This statement is related to gibberellin.

- **Option 2: Conversion of Long Day Plants to Short Day Plants**:
- Gibberellins can help in the flowering of long-day plants under short-day conditions by promoting growth and development.
- **Conclusion**: This statement is also related to gibberellin.

- **Option 3: Removal of Genetic Dwarfism**:
- Gibberellins were discovered due to their effect on dwarf rice plants, where they promote growth and help in overcoming genetic dwarfism.
- **Conclusion**: This statement is related to gibberellin.

- **Option 4: Bending Movement of Coleoptile**:
- The bending movement of coleoptiles (the protective sheath covering the emerging shoot) is primarily regulated by auxins, not gibberellins.
- **Conclusion**: This statement is not related to gibberellin.

3. **Final Answer**:
- The option that is not related to gibberellin is **Option 4: Bending movement of coleoptile**.

### Summary:
- **Correct Answer**: Option 4 (Bending movement of coleoptile)