The specific-property attributed to gibberellins is

Options

A. Shortening of genetically tall plants
B. Elongation of genetically dwarf plant
C. Promotion of rooting
D. Yellowing of young leaves.

Answer

To solve the question regarding the specific property attributed to gibberellins, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Gibberellins**: Gibberellins are a class of plant hormones that play a crucial role in various growth processes in plants, including stem elongation, seed germination, and flowering.

2. **Analyze the Options**:
- **Option A**: Shortening of genetically tall plants.
- Gibberellins promote growth, so they do not shorten tall plants. This option is incorrect.

- **Option B**: Elongation of genetically dwarf plants.
- Gibberellins are known to promote elongation, especially in dwarf plants that lack the ability to grow tall due to genetic factors. This option is likely correct.

- **Option C**: Promotion of rooting.
- While gibberellins can influence rooting, this is not their specific property. Other hormones like auxins are more directly involved in rooting. This option is incorrect.

- **Option D**: Yellowing of young leaves.
- Gibberellins do not cause yellowing of leaves; this is usually associated with senescence or nutrient deficiency. This option is incorrect.

3. **Conclusion**: The specific property attributed to gibberellins is the elongation of genetically dwarf plants, making **Option B** the correct answer.

### Final Answer:
The specific property attributed to gibberellins is the **elongation of genetically dwarf plants**.