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Questions and Answers
What defines an obligate parasite?
What defines an obligate parasite?
- An organism that solely depends on living organisms for sustenance. (correct)
- An organism that can live on both living and dead matter.
- An organism that has the ability to thrive in various environments.
- An organism that primarily feeds on dead matter.
Which term describes a plant's ability to withstand a pathogen without significant loss in yield?
Which term describes a plant's ability to withstand a pathogen without significant loss in yield?
- Tolerance (correct)
- Susceptibility
- Virulence
- Resistance
What does virulence measure in relation to a pathogen?
What does virulence measure in relation to a pathogen?
- The genetic makeup of the pathogen.
- The ability of plants to resist disease.
- The rate of growth of the pathogen.
- The amount of disease caused by the pathogen in a group of plants. (correct)
Which of the following describes a facultative saprophyte?
Which of the following describes a facultative saprophyte?
What does the term pathogenesis refer to?
What does the term pathogenesis refer to?
What term refers to the inherent ability of an organism to overcome the effects of a pathogen?
What term refers to the inherent ability of an organism to overcome the effects of a pathogen?
Which of the following describes a host?
Which of the following describes a host?
What does the term susceptibility mean in the context of plant diseases?
What does the term susceptibility mean in the context of plant diseases?
Which term best describes an organism that usually acts as a parasite but can also live as a saprophyte?
Which term best describes an organism that usually acts as a parasite but can also live as a saprophyte?
What is the impact of virulence when considering a pathogen's ability?
What is the impact of virulence when considering a pathogen's ability?
Flashcards
Pathogen
Pathogen
A living agent that causes disease.
Parasite
Parasite
An organism that lives off another living thing, without helping it.
Obligate Parasite
Obligate Parasite
A parasite that MUST live on a living thing.
Virulence
Virulence
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Resistance
Resistance
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Saprophyte
Saprophyte
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Facultative Saprophyte
Facultative Saprophyte
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Host
Host
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What is the difference between a 'suscept' and a 'host'?
What is the difference between a 'suscept' and a 'host'?
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Tolerance
Tolerance
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Study Notes
Pathogen Definitions
- A pathogen is any living agent that causes disease.
- A parasite is an organism that relies on another living organism for food, providing no benefit in return.
- An obligate parasite is an organism that solely lives on living organisms, attacking only their tissues.
- A saprophyte lives on dead organic or inorganic matter.
- A facultative saprophyte can be a saprophyte but is typically a parasite.
Host and Suscept
- A host is a plant targeted by a parasite or pathogen.
- A suscept is a plant vulnerable to disease, regardless of whether the pathogen is a parasite.
Disease Development
- Pathogenesis describes the entire process of disease development in a host, starting from infection to the appearance of symptoms.
Pathogen Traits
- Virulence is the severity of disease caused by a pathogen isolate in a plant population, measured by lesion size or number.
- Aggressiveness describes how quickly a pathogen expresses its virulence.
Plant Responses to Disease
- Resistance is a plant's inherent ability to combat a pathogen.
- Susceptibility is the opposite of resistance, meaning the ability to be infected.
- Tolerance is a plant's ability to be severely affected by a pathogen without significant yield loss.
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