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In humans, the activation of sympathetic...

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

A

auxin

B

Cytokinin

C

Abscisic acid

D

Ethylene

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The correct Answer is:
To solve the question regarding the similarity of the fight or flight response in humans and plants, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Human Response**: - In humans, the sympathetic nervous system activates in response to stress, such as seeing a snake. This triggers the adrenal medulla to release hormones like epinephrine (adrenaline) and norepinephrine (noradrenaline). - These hormones prepare the body for a "fight or flight" response by increasing heart rate, blood flow, and alertness. 2. **Identifying Plant Responses**: - Plants also have mechanisms to respond to stress, but they do not have a nervous system like humans. Instead, they rely on hormones to manage stress responses. 3. **Exploring Plant Hormones**: - There are various plant hormones (also known as plant growth regulators) that can either stimulate or inhibit growth: - **Auxins**: Promote cell elongation and growth. - **Cytokinins**: Stimulate cell division. - **Gibberellins (GA)**: Promote stem elongation and seed germination. - **Ethylene**: Can act as both a promoter and inhibitor of growth. - **Abscisic Acid (ABA)**: Known as the stress hormone in plants. 4. **Focusing on Abscisic Acid**: - Abscisic acid (ABA) is specifically known for its role in plant stress responses. It is released during stressful conditions such as drought. - ABA causes the closure of stomata, which reduces water loss and helps the plant conserve resources during stress. 5. **Conclusion**: - The correct answer to the question is **Abscisic Acid (ABA)**, as it serves a similar function in plants as epinephrine and norepinephrine do in humans during stress responses. ### Final Answer: **Abscisic Acid (ABA)** is the hormone in plants that provides a similar type of response to the fight or flight response in humans.
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