Fungi as Pathogens (Lec 8) (Set 2)
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Questions and Answers

Fungi can only cause diseases in humans and animals, and not in plants.

False

Fungal infections are becoming more prevalent in humans.

True

Thermal dimorphism is a characteristic of true pathogens.

True

Coccidioidomycosis is most common in desert soils.

<p>True</p> Signup and view all the answers

Coccidioidomycosis is a life-threatening disease.

<p>False</p> Signup and view all the answers

Human mycoses are a mounting clinical problem due to the increasing number of immunocompromised patients.

<p>True</p> Signup and view all the answers

There are currently many effective antifungal treatments available for mycoses in humans.

<p>False</p> Signup and view all the answers

Phytopathogenic fungi only attack mature and non-compromised plant tissue.

<p>False</p> Signup and view all the answers

Necrotrophic pathogens are pathogens that attack immature tissue.

<p>False</p> Signup and view all the answers

Soil-borne pathogens only attack the roots of plants.

<p>False</p> Signup and view all the answers

Oomycetes were originally classified as fungi but have been reclassified as oomycete protists.

<p>True</p> Signup and view all the answers

Oomycetes are more closely related to algae than fungi.

<p>True</p> Signup and view all the answers

Oomycetes are known for their aggressive invasion of root tips.

<p>True</p> Signup and view all the answers

Oomycetes are pathogens of mature tissue.

<p>True</p> Signup and view all the answers

Oomycetes are usually highly host-specific.

<p>True</p> Signup and view all the answers

Oomycetes are necrotrophic pathogens that excrete toxins and cell wall digesting enzymes.

<p>True</p> Signup and view all the answers

Oomycetes evoke host resistance mechanisms.

<p>False</p> Signup and view all the answers

Biotrophic pathogens, such as rust and powdery mildew, are examples of necrotrophic pathogens.

<p>False</p> Signup and view all the answers

Biotrophic pathogens maintain host viability and have limited tissue invasion.

<p>True</p> Signup and view all the answers

Puccinia graminis infects mesophyll cells by entering through stomatal openings.

<p>True</p> Signup and view all the answers

Which of the following is NOT a reason why human mycoses are a mounting clinical problem?

<p>Control of mycoses of humans</p> Signup and view all the answers

Which of the following is a characteristic of true pathogens?

<p>Restricted to specific geographical regions – limited number (approx. 10) of species known to cause systemic infections in humans</p> Signup and view all the answers

Which of the following is an example of a necrotrophic pathogen?

<p>Puccinia graminis</p> Signup and view all the answers

Which of the following is a major group of phytopathogenic fungi?

<p>Biotrophic pathogens</p> Signup and view all the answers

Which of the following statements about oomycetes is NOT true?

<p>Soil-borne pathogens only attack the roots of plants</p> Signup and view all the answers

Which group of organisms were oomycetes originally classified as?

<p>Fungi</p> Signup and view all the answers

What is the main difference between necrotrophic pathogens and biotrophic pathogens?

<p>Necrotrophic pathogens excrete toxins and cell wall digesting enzymes, while biotrophic pathogens do not</p> Signup and view all the answers

How do biotrophic pathogens infect plants?

<p>Through stomatal openings</p> Signup and view all the answers

Which oomycete pathogen is an example of a necrotrophic pathogen?

<p>Armillaria mellea</p> Signup and view all the answers

What is the scale of the problem with Puccinia graminis infected wheat?

<p>An infected crop can produce 1.5 trillion spores per day for several weeks</p> Signup and view all the answers

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