Plant hormones, which responses to wounds and stresses of biotic & abiotic origin & are also involved in dormancy & abscission, are-

Answer

To answer the question regarding the plant hormones that respond to wounds and stresses of biotic and abiotic origin, as well as their involvement in dormancy and abscission, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Functions of Plant Hormones**:
- Understand that plant hormones play crucial roles in responding to environmental stresses, regulating growth, and facilitating processes like dormancy and abscission.

2. **Focus on Abscisic Acid (ABA)**:
- Recognize that abscisic acid is primarily known as a "stress hormone." It is released in response to various stress conditions, such as drought or other unfavorable environmental factors.
- Note that ABA promotes seed dormancy, helping plants survive during adverse conditions by preventing germination until conditions are favorable.

3. **Understand the Role of Ethylene**:
- Acknowledge that ethylene is another important plant hormone that is involved in the process of abscission (the shedding of leaves, flowers, or fruits).
- Ethylene is also involved in the plant's response to biotic and abiotic stresses, aiding in the adaptation and survival of the plant.

4. **Summarize the Key Hormones**:
- Conclude that the two main hormones involved in responding to wounds and stresses, as well as in dormancy and abscission, are:
- **Abscisic Acid (ABA)**: Primarily a stress hormone that promotes seed dormancy and helps plants cope with drought.
- **Ethylene**: Involved in abscission and responses to various stresses.

### Final Answer:
The plant hormones that respond to wounds and stresses of biotic and abiotic origin and are involved in dormancy and abscission are **Abscisic Acid (ABA)** and **Ethylene**.

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