Avena coleoptile test detects the presence of

Options

A. IAA
B. GA
C. NAA
D. BAP

Answer

### Step-by-Step Solution:

1. **Understanding the Avena Coleoptile Test**:
- The Avena coleoptile test, also known as the Avena curvature test, was developed by Fritz Went to study the growth response in the coleoptile of germinating oats (Avena sativa).
- This test is used to observe the curvature of the coleoptile tips in response to a substance that promotes growth.

2. **Identifying the Substance Detected**:
- The primary focus of the test is to detect a growth hormone that influences the curvature of the coleoptile.
- This hormone is known as auxin, which is responsible for the elongation of plant cells.

3. **Chemical Identification of Auxin**:
- The most common naturally occurring form of auxin is Indole-3-acetic acid (IAA).
- Other synthetic auxins include Naphthalene acetic acid (NAA) and 6-Benzylaminopurine (BAP), but the Avena coleoptile test specifically detects IAA.

4. **Conclusion**:
- Therefore, the Avena coleoptile test is used to detect the presence of Indole-3-acetic acid (IAA), which is the correct answer to the question.

### Final Answer:
The Avena coleoptile test detects the presence of **IAA (Indole Acetic Acid)**.

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