Question:
Which of the following is considered as host response to pathogens?
Which of the following is considered as host response to pathogens?
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Host responses include visible Symptoms (macroscopic disease expression) and Hypersensitive Response (localized cell suicide HR).
Updated On: Sep 15, 2026
- Symptoms only
- Hypersensitivity only
- Symptoms and hypersensitivity
- Neither symptoms nor hypersensitivity
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
When a plant host is challenged by an infectious plant pathogen, it mounts histological, physiological, and morphological responses.
Step 2: Detailed Explanation:
1. Symptoms: Macroscopic or microscopic manifestations of disease in the host plant resulting from pathogen-induced physiological disturbance (e.g., necrosis, chlorosis, wilting, galls).
2. Hypersensitivity (HR): A rapid, localized programmed cell death response triggered at the infection site to arrest biotrophic pathogen growth and contain invasion.
Both symptoms and hypersensitive response are active physiological expressions and responses of the host plant.
Step 3: Final Answer:
Therefore, symptoms and hypersensitivity are both host responses.
When a plant host is challenged by an infectious plant pathogen, it mounts histological, physiological, and morphological responses.
Step 2: Detailed Explanation:
1. Symptoms: Macroscopic or microscopic manifestations of disease in the host plant resulting from pathogen-induced physiological disturbance (e.g., necrosis, chlorosis, wilting, galls).
2. Hypersensitivity (HR): A rapid, localized programmed cell death response triggered at the infection site to arrest biotrophic pathogen growth and contain invasion.
Both symptoms and hypersensitive response are active physiological expressions and responses of the host plant.
Step 3: Final Answer:
Therefore, symptoms and hypersensitivity are both host responses.
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