Gibberellic acid induces flowering

Options

A. a) in short day plants under long day conditions
B. b) in day-neutral plants under dark conditions
C. c) in come gymnosperimic plants only
D. d) in long day plants under short day conditions

Answer

To solve the question regarding gibberellic acid and its role in inducing flowering, let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding Gibberellic Acid**:
- Gibberellic acid (GA) is a plant hormone that plays a crucial role in various growth processes, including stem elongation, seed germination, and flowering.

2. **Types of Plants Based on Day Length**:
- Plants can be categorized based on their flowering response to day length:
- **Short Day Plants (SDP)**: Flower when the day length is shorter than a critical duration.
- **Long Day Plants (LDP)**: Flower when the day length is longer than a critical duration.
- **Day Neutral Plants (DNP)**: Flower regardless of day length.

3. **Bolting**:
- Bolting is the rapid elongation of the flowering stem, which is often induced by gibberellic acid. This process requires either long days or a cold treatment.

4. **Application of Gibberellic Acid**:
- Gibberellic acid can induce flowering in long day plants even under short day conditions. This means that LDPs can still flower if gibberellic acid is applied, despite the shorter day length.

5. **Evaluating the Options**:
- **Option A**: In short day plants under long day conditions - Incorrect.
- **Option B**: In day neutral plants under dark conditions - Incorrect.
- **Option C**: In some gymnospermic plants only - Incorrect.
- **Option D**: In long day plants under short day conditions - Correct.

6. **Conclusion**:
- The correct answer is **Option D**: Gibberellic acid induces flowering in long day plants under short day conditions.