Select the incorrect function w.r.t gibberellin.

Options

A. Accelerates cell elongation only under in vitro conditions
B. They are weakly acidic hormones
C. First isolated from the fungus Gibberella fujikuroi
D. They occur naturally in plants

Answer

To solve the question regarding the incorrect function of gibberellin, we can follow these steps:

### Step 1: Understand Gibberellins
Gibberellins are a class of plant hormones that play a crucial role in regulating various aspects of plant growth and development. They are known for promoting stem elongation, seed germination, and flowering.

### Step 2: Analyze the Functions of Gibberellins
1. **Cell Elongation**: Gibberellins are known to promote cell elongation, particularly in stems and leaves.
2. **Seed Germination**: They help in breaking dormancy and promoting seed germination.
3. **Bolting**: Gibberellins promote bolting in plants, which is the rapid growth of the flowering stem.
4. **Malting**: They are involved in the malting process, especially in barley.

### Step 3: Evaluate the Statements
Now, let’s evaluate the statements provided in the question:
- **Statement 1**: "Accelerate cell elongation only under in vitro conditions."
- **Statement 2**: "They are weakly acidic hormones first isolated from fungus Gibberella fujikuroi."
- **Statement 3**: "They occur naturally in plants."

### Step 4: Identify the Incorrect Statement
- **Statement 1** is incorrect because gibberellins can accelerate cell elongation not only in vitro but also in vivo (in living plants). They are effective in promoting growth in natural conditions as well.
- **Statements 2 and 3** are correct as gibberellins are indeed weakly acidic hormones and are naturally occurring in plants.

### Conclusion
The incorrect function with respect to gibberellin is:
- **Accelerate cell elongation only under in vitro conditions.**