Phytophthora infestans Quiz
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Questions and Answers

What type of organism is Phytophthora infestans?

  • Primary decomposer
  • Strict pathogen only
  • Facultative saprophyte (correct)
  • Obligate saprophyte only

Which of the following is true regarding conidia?

  • They germinate only through stomata.
  • They can germinate both directly and indirectly. (correct)
  • They only reproduce in the absence of moisture.
  • They can only develop directly into zoospores.

During the vegetative cycle, where do conidiophores emerge from?

  • From mature shoots
  • Directly from the tubers
  • Through the stomata (correct)
  • From root structures

What structure helps in the mating process of Phytophthora infestans?

<p>Compatibility factor (B)</p> Signup and view all the answers

What is the characteristic feature of the antheridium in Phytophthora infestans?

<p>It is collar-like and located at the base of the oogonium. (C)</p> Signup and view all the answers

What controls the sexual cycle mating in this organism?

<p>Compatibility factor (D)</p> Signup and view all the answers

Which of the following statements about the organism's reproduction is true?

<p>It may be heterothallic or facultative homothallic. (D)</p> Signup and view all the answers

Where is the antheridium located in relation to the oogonium?

<p>At the base of the oogonium (A)</p> Signup and view all the answers

What is the shape description of the antheridium?

<p>Collar-like (D)</p> Signup and view all the answers

How does the oogonium interact with the antheridium?

<p>It pierces the antheridium and grows through it. (B)</p> Signup and view all the answers

Flashcards

Phytophthora infestans

A type of fungus that causes "Late Blight of Potato and Tomato". It can survive as a decomposer or a parasite, meaning it can obtain food from dead organic matter or live organisms.

Mycelium

A network of branching filaments that make up the body of a fungus. In Phytophthora infestans, the mycelium produces conidiophores that emerge through the stomata of the host plant.

Conidiophores

Reproductive structures that produce conidia, which are asexual spores. They are produced by the mycelium and emerge through the stomata of the host plant.

Conidia

Asexual spores produced by conidiophores. They can either germinate directly or develop into zoospores.

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Sexual Cycle

This is the sexual reproduction process of Phytophthora infestans. Two compatible strains, a male and a female, fuse to produce a new, more resilient form of the fungus.

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Compatibility factor in sexual cycle mating

A unique factor that determines compatibility during mating, controlling which individuals can reproduce with each other.

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Heterothallic

A type of organism where individuals can only mate with individuals of a different mating type.

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Facultative homothallic

The term 'facultative' refers to the ability to do something under certain conditions. In this context, it means that an organism may be capable of self-fertilization only under specific circumstances or conditions.

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Antheridium

The male reproductive organ in this organism. It looks like a collar around the base of the female reproductive organ (oogonium).

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Oogonium

The female reproductive organ in this organism. It is located at the top of the structure and is responsible for producing eggs.

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