By this time, more than 100 different gibberellins have been identified.

Answer

**Step-by-Step Text Solution:**

1. **Understanding Gibberellins**: Gibberellins are a class of plant hormones that play a crucial role in regulating various aspects of plant growth and development, such as seed germination, stem elongation, and flowering.

2. **Historical Context**: The first gibberellin was discovered in 1926 by E. Kurosawa, a plant pathologist. It was isolated from the fungus *Gibberella fujikuroi*, which is known to cause a disease in rice plants.

3. **Identification of Gibberellins**: Over the years, researchers have identified more than 100 different gibberellins. These gibberellins are denoted by the abbreviation "GA" followed by a number (e.g., GA1, GA2, GA3, etc.).

4. **Sources of Gibberellins**: Gibberellins are not only produced by fungi but also by higher plants. This indicates their widespread occurrence and importance in plant biology.

5. **Conclusion**: Since it is true that more than 100 different gibberellins have been identified, the statement in the question is correct.

**Final Answer**: True

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