Parthenocarpy is induced by

Options

A. ABA
B. Auxin
C. Zeatin
D. Cytokinin

Answer

To solve the question "Parthenocarpy is induced by," we need to identify which plant hormone is responsible for inducing parthenocarpy, a process where fruits develop without fertilization and thus are typically seedless.

### Step-by-Step Solution:

1. **Understand Parthenocarpy**:
- Parthenocarpy refers to the development of fruit without fertilization, resulting in seedless fruits. This can occur naturally or can be induced artificially.

**Hint**: Remember that parthenocarpy leads to seedless fruits, which is a key characteristic.

2. **Identify the Hormones**:
- The question provides several options, including Abscisic Acid (ABA), Auxin, Zeatin, and Cytokinin. We need to analyze each hormone's role in fruit development.

3. **Examine Abscisic Acid (ABA)**:
- ABA is known to promote seed dormancy and can inhibit growth. It does not play a role in inducing parthenocarpy. Instead, it hinders seed generation.

**Hint**: Focus on the functions of ABA; it promotes dormancy rather than fruit development.

4. **Examine Auxin**:
- Auxin is a plant hormone that promotes cell division and elongation. It is specifically known to induce parthenocarpy by transforming the unfertilized ovary into a fruit.

**Hint**: Auxin is crucial for fruit development and is directly linked to inducing parthenocarpy.

5. **Examine Zeatin**:
- Zeatin is a type of cytokinin that promotes lateral bud growth and cell division but does not induce parthenocarpy.

**Hint**: Zeatin's role is more about growth and development rather than inducing seedless fruit.

6. **Examine Cytokinin**:
- Cytokinins, including zeatin, are involved in cell division and can promote growth in various plant parts. However, they do not induce parthenocarpy.

**Hint**: Cytokinins are important for growth but not specifically for inducing parthenocarpy.

7. **Conclusion**:
- After analyzing all options, the hormone that induces parthenocarpy is **Auxin**. Therefore, the correct answer is **Auxin**.

### Final Answer:
**Auxin** is the hormone that induces parthenocarpy.