Fungi: Structure, Nutrition & Lifestyle

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Questions and Answers

Fungi are indispensable for terrestrial ecosystems primarily because of their role as:

  • Mutualists, providing structural support to plants.
  • Parasites, controlling populations of other organisms.
  • Primary producers, converting sunlight into energy.
  • Decomposers, recycling organic material and nutrients. (correct)

Which nutritional mode is exclusively observed in fungi?

  • Ingestive heterotrophy
  • Absorptive heterotrophy (correct)
  • Chemoautotrophy
  • Photoautotrophy

Fungi exhibit diverse lifestyles, including all of the following EXCEPT:

  • Decomposers, breaking down dead organic matter.
  • Parasites, living on and harming host organisms.
  • Mutualists, engaging in mutually beneficial relationships.
  • Autotrophs, producing their own food through photosynthesis. (correct)

The filamentous body structure common to most fungi is known as:

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

The cell walls of fungi are primarily composed of:

<p>Chitin (A)</p> Signup and view all the answers

A mycelium is best described as:

<p>A mass of interconnected hyphae. (D)</p> Signup and view all the answers

Septate hyphae are characterized by:

<p>Cross-walls dividing hyphae into cells. (D)</p> Signup and view all the answers

Coenocytic hyphae differ from septate hyphae because they:

<p>Lack cross-walls and have continuous cytoplasm. (C)</p> Signup and view all the answers

Haustoria are specialized hyphae primarily used by fungi for:

<p>Penetrating and extracting nutrients from host tissues. (A)</p> Signup and view all the answers

Mycorrhizae represent a mutually beneficial symbiotic relationship between fungi and:

<p>Plant roots. (C)</p> Signup and view all the answers

Fungi predominantly propagate through the production of:

<p>Spores (A)</p> Signup and view all the answers

In the sexual life cycle of fungi, plasmogamy refers to:

<p>Cytoplasmic fusion. (A)</p> Signup and view all the answers

A heterokaryon fungal mycelium is characterized by:

<p>Coexisting, genetically different haploid nuclei. (A)</p> Signup and view all the answers

Karyogamy, in the fungal life cycle, is the process of:

<p>Nuclear fusion. (A)</p> Signup and view all the answers

The transient diploid stage in the fungal sexual life cycle is a direct result of:

<p>Karyogamy. (A)</p> Signup and view all the answers

Asexual reproduction in fungi can occur through various methods EXCEPT:

<p>Meiosis followed by spore formation. (D)</p> Signup and view all the answers

Fungi that lack a known sexual stage are classified as:

<p>Anamorphs. (D)</p> Signup and view all the answers

Based on molecular evidence, fungi are most closely related to:

<p>Animals. (D)</p> Signup and view all the answers

Chytrids are unique among fungi because they:

<p>Have flagellated spores. (D)</p> Signup and view all the answers

Which fungal phylum includes fast-growing molds, parasites, and commensal symbionts?

<p>Zygomycota. (C)</p> Signup and view all the answers

Glomeromycetes are characterized by their role in forming:

<p>Mycorrhizae. (D)</p> Signup and view all the answers

Ascomycetes are distinguished by their sac-like structures for sexual spore production called:

<p>Asci. (D)</p> Signup and view all the answers

Asexual spores produced by ascomycetes are known as:

<p>Conidia. (A)</p> Signup and view all the answers

Basidiomycetes, often called club fungi, are characterized by:

<p>Basidia. (C)</p> Signup and view all the answers

Mushrooms, puffballs, and shelf fungi are examples of:

<p>Basidiomycetes. (A)</p> Signup and view all the answers

The fruiting body of a basidiomycete is called a:

<p>Basidiocarp. (C)</p> Signup and view all the answers

Fungi are highly effective decomposers due to their ability to break down complex organic molecules like:

<p>Cellulose and lignin. (D)</p> Signup and view all the answers

Endophytes are symbiotic fungi that live:

<p>Within plant tissues. (A)</p> Signup and view all the answers

Lichens are a symbiotic association between a fungus and:

<p>An alga or cyanobacterium. (B)</p> Signup and view all the answers

Lichens are considered pioneer organisms because they:

<p>Are the first to colonize barren rock and soil. (D)</p> Signup and view all the answers

Approximately what percentage of known fungal species are considered parasites or pathogens?

<p>30% (C)</p> Signup and view all the answers

Ergot of rye is caused by an ascomycete fungus and is known for producing:

<p>Toxins. (C)</p> Signup and view all the answers

The symptoms of ergotism, historically significant in the Middle Ages, include all EXCEPT:

<p>Increased appetite. (C)</p> Signup and view all the answers

The decline in amphibian populations worldwide is potentially linked to a parasitic:

<p>Chytrid. (C)</p> Signup and view all the answers

Which of the following represents the correct sequence of events during fungal sexual reproduction?

<p>Plasmogamy → Karyogamy → Meiosis (C)</p> Signup and view all the answers

Compared to animals, plants are generally considered:

<p>More susceptible to fungal parasites. (B)</p> Signup and view all the answers

In the context of nutrient cycling, fungi are essential because they:

<p>Break down organic matter, releasing nutrients. (A)</p> Signup and view all the answers

Which of the following fungal groups is characterized by having the largest number of species?

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

The 'fairy ring' phenomenon, often seen in lawns, is a visual manifestation of the growth pattern of:

<p>Basidiomycete mycelia. (A)</p> Signup and view all the answers

The primary role of the fungal partner in a lichen is to provide:

<p>Structure and protection. (B)</p> Signup and view all the answers

Which of these fungal structures is directly involved in asexual reproduction?

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

The ecological significance of fungi in 'essential recycling of chemical elements' primarily refers to their role in:

<p>Decomposition. (D)</p> Signup and view all the answers

Which phylum of fungi is largely responsible for forming arbuscular mycorrhizae with plant roots?

<p>Glomeromycota (A)</p> Signup and view all the answers

Which of the following scenarios best illustrates the role of fungi as decomposers in an ecosystem?

<p>Fungi breaking down fallen leaves and wood, returning nutrients to the soil. (D)</p> Signup and view all the answers

If you were to examine a sample of forest soil under a microscope, which fungal structure would you most likely observe as the primary component of the fungal biomass?

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

Consider a fungal mycelium described as heterokaryotic. What is the defining characteristic of this mycelium in terms of its nuclear content?

<p>It contains multiple haploid nuclei from different parents. (D)</p> Signup and view all the answers

In the life cycle of zygomycetes like Rhizopus, what is the primary function of the zygosporangium?

<p>To provide a resistant structure during sexual reproduction that can withstand harsh conditions. (B)</p> Signup and view all the answers

Which of the following fungal groups is characterized by the production of sexual spores in sac-like asci and asexual spores called conidia?

<p>Ascomycetes (A)</p> Signup and view all the answers

How does the nutritional mode of fungi primarily differ from that of animals?

<p>Fungi absorb nutrients from their surroundings after external digestion, while animals typically ingest and then digest food internally. (B)</p> Signup and view all the answers

What ecological role is specifically associated with glomeromycetes?

<p>Formation of arbuscular mycorrhizae with plant roots, enhancing nutrient uptake. (C)</p> Signup and view all the answers

Which characteristic distinguishes chytrids from all other phyla of fungi?

<p>They possess flagellated spores (zoospores). (A)</p> Signup and view all the answers

What is the primary ecological consequence of fungi being able to break down cellulose and lignin?

<p>Enhanced nutrient cycling in ecosystems through decomposition of plant matter. (C)</p> Signup and view all the answers

In the context of fungal reproduction, what is karyogamy, and when does it typically occur in the fungal life cycle?

<p>The fusion of nuclei; it may be delayed and follow plasmogamy. (A)</p> Signup and view all the answers

Lichens are described as symbiotic associations. Which partners are involved in this symbiosis, and what is the nature of their interaction?

<p>A fungus and algae or cyanobacteria, in a mutualistic relationship where the fungus provides structure and the photobiont provides food. (C)</p> Signup and view all the answers

What is the primary function of haustoria, specialized hyphae found in some fungi?

<p>To penetrate host tissues and absorb nutrients. (B)</p> Signup and view all the answers

If a fungus is described as an 'anamorph', what does this indicate about its known life cycle?

<p>Its sexual stage has not been observed or is absent. (D)</p> Signup and view all the answers

Consider a mushroom, which is the fruiting body of a basidiomycete. What is its main role in the fungal life cycle?

<p>Sexual spore production and dispersal. (D)</p> Signup and view all the answers

How do coenocytic hyphae differ structurally from septate hyphae?

<p>Coenocytic hyphae lack cross-walls, resulting in a continuous cytoplasmic mass with multiple nuclei, whereas septate hyphae are divided into cells by septa. (C)</p> Signup and view all the answers

Which of the following best describes the ecological role of endophytes?

<p>Fungi that live within plant tissues, often without causing disease, and may benefit the plant. (C)</p> Signup and view all the answers

What is plasmogamy in the fungal sexual life cycle, and what is its immediate result?

<p>Cytoplasmic fusion; creating a heterokaryotic or dikaryotic stage. (C)</p> Signup and view all the answers

Why are lichens considered 'pioneer organisms'?

<p>Because they are the first to colonize and modify bare rock and soil, making it possible for other organisms like plants to follow. (B)</p> Signup and view all the answers

Ergot of rye is caused by an ascomycete fungus and is known to produce toxins. Historically, what condition is associated with the consumption of ergot-contaminated grains?

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

The worldwide decline in amphibian populations has been linked to a specific parasitic fungus. To which fungal phylum does this pathogen, Batrachochytrium dendrobatidis, belong?

<p>Chytridiomycota (A)</p> Signup and view all the answers

Which of the following represents the correct ploidy level of fungal nuclei for most of their life cycle?

<p>Haploid (n) (C)</p> Signup and view all the answers

What is the 'fairy ring' phenomenon often observed in lawns, and what fungal structure is primarily responsible for its formation?

<p>A ring of mushrooms resulting from the outward growth of a fungal mycelium in the soil. (C)</p> Signup and view all the answers

What is the main role of the fungal partner in mycorrhizal associations?

<p>To enhance the plant's uptake of water and nutrients, especially phosphorus and nitrogen, from the soil. (D)</p> Signup and view all the answers

Which fungal structure is directly involved in asexual spore production in ascomycetes?

<p>Conidiophore (A)</p> Signup and view all the answers

The term 'essential recycling of chemical elements' in the context of fungal ecology primarily refers to their role in:

<p>Decomposition of organic matter and nutrient cycling. (B)</p> Signup and view all the answers

Which fungal phylum is known to have the largest number of species?

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

What is the transient diploid stage in the fungal sexual life cycle a direct result of?

<p>Karyogamy (A)</p> Signup and view all the answers

Asexual reproduction in fungi can occur through various methods. Which of the following is a method of asexual reproduction in fungi?

<p>Spore production (B)</p> Signup and view all the answers

Based on molecular evidence, fungi are most closely related to which of the following groups?

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

Flashcards

Fungi's Ecological Role

Fungi are critical decomposers, parasites, and mutualists in terrestrial ecosystems.

Fungi Nutrition

Fungi are heterotrophs that absorb nutrients after enzymatic digestion.

Fungi Lifestyles

Decomposers, parasites, and mutualists

Fungi Body Structures

Multicellular filaments (hyphae) and single cells (yeasts)

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Mycelium

A network of hyphae forming the fungal body

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Fungal Cell Walls

They are composed of chitin

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Septate Hyphae

Hyphae with cross-walls (septa) that divide them into cells, containing pores for cell-to-cell movement.

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Coenocytic Hyphae

Hyphae lacking septa, resulting in a continuous cytoplasmic mass with multiple nuclei.

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Haustoria

Specialized hyphae that penetrate the tissues of the host allow them to extract nutrients from plants.

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Mycorrhizae

Mutually beneficial relationships between fungi and plant roots; enhance nutrient and water uptake.

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Fungal Propagation

Vast numbers of spores, either sexually or asexually.

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Plasmogamy

Union of cytoplasm from two parent mycelia

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Heterokaryon

Haploid nuclei coexist in the mycelium without fusing

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Karyogamy

Fusion of haploid nuclei, forming a diploid cell

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Anamorphs

Fungi with no known sexual stage

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Chytrids

An early-diverging fungal lineage found in the genus Rozella

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Chytrid Habitats

Chytrids are found in terrestrial, freshwater, and marine habitats.

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Zygomycetes

Include fast-growing molds, parasites, and commensal symbionts.

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Glomeromycetes

Were once considered zygomycetes

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Ascomycetes

Produce sexual spores called asci in fruiting bodies called ascocarps

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Basidiomycetes

Mushrooms, puffballs, and shelf fungi

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Basidium

Clublike structure, transient diploid stage

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Basidiocarps

Elaborate fruiting bodies of basidiomycetes

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Fungi Decomposition

Fungi's role as decomposers in ecosystems

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Lichen

Symbiotic association between a photosynthetic microorganism and a fungus.

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Fungi as Parasites

About 30% of known fungal species are parasites or pathogens

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Ergot of Rye

Caused by ascomycete and produces toxins

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