In humans, the activation of sympathetic nervous system stimulates the adrenal medulla to release certain hormones that help in fight and fight response. A similar type of response in plants can be given by

Options

A. auxin
B. Cytokinin
C. Abscisic acid
D. Ethylene

Answer

To solve the question regarding the plant response similar to the fight-or-flight response in humans, we can follow these steps:

### Step 1: Understand the Fight-or-Flight Response
- The fight-or-flight response in humans is primarily mediated by the sympathetic nervous system, which activates the adrenal medulla to release hormones like adrenaline (epinephrine) and norepinephrine. These hormones prepare the body to respond to stress or danger.

**Hint:** Consider what physiological changes occur in humans during stress and how plants might respond to similar stressors.

### Step 2: Identify Plant Hormones
- In plants, hormones play a crucial role in responding to environmental stress. The key hormones include:
- **Auxins**: Promote growth and elongation.
- **Cytokinins**: Promote cell division and growth.
- **Ethylene**: Involved in fruit ripening and senescence.
- **Abscisic Acid (ABA)**: Often referred to as the stress hormone, it helps plants cope with stress conditions such as drought.

**Hint:** Focus on which plant hormone is known for its role in stress response and dormancy.

### Step 3: Relate Plant Hormones to Stress Response
- Among the hormones mentioned, abscisic acid (ABA) is particularly significant in stress responses. It helps plants manage water loss during drought and induces dormancy in seeds under unfavorable conditions.

**Hint:** Think about how a plant might "prepare" for adverse conditions, similar to how humans prepare for danger.

### Step 4: Conclusion
- The hormone that best resembles the role of the adrenal medulla in humans, in terms of managing stress and promoting survival under adverse conditions, is **Abscisic Acid**. It acts to restrict growth during stress and helps in dormancy, akin to how adrenaline prepares humans for immediate action.

**Final Answer:** The hormone in plants that provides a similar response to the fight-or-flight mechanism in humans is **Abscisic Acid**.