Name the hormone that acts as an antagonistic to ABA. From which micro-organism was it extracted initially? List the two bioassays of this hormone.

Explanation

### Step-by-Step Solution:

1. **Identify the Hormone Antagonistic to ABA**:
- The hormone that acts as an antagonist to abscisic acid (ABA) is **gibberellin**.

2. **Source of Gibberellin**:
- Gibberellin was initially extracted from a microorganism known as **Gibberella fujikuroi**, which is a type of fungus.

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