Download - Ch 11 Section 2 Fungi. Fungi Eukaryotic consumers Come in a variety of shapes, sizes and colors
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Ch 11 Section 2 Fungi
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Fungi
Eukaryotic consumers
Come in a variety of shapes, sizes and colors
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Hidden from View
Hyphae- chains of cells that make up multicellular fungi
Mycelium- a twisted mass of fungal hyphae that have grown together
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Consumers
Fungi are consumers
that cannot eat or engulf food.
They must live on or
near their food supply
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Getting Food
Most fungi obtain nutrients by secreting digestive juices onto the food source, then absorbing the dissolved substances
Many are decomposers
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Roots with fungi
Some fungi live in symbiotic relationships with other organisms
On roots of plants – produce acid to change the minerals in the soil
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Fungi cytoplasm
Holes in the cell walls of fungi allow the cytoplasm to move between cells throughout the organism
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Reproduction
Asexual or sexualAsexual
Hyphae breaks apart and each new piece becomes a new individual
Production of spores
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Reproduction
Spores – a small reproductive cell protected by a thick wall
SexualFungi produce sex cells from special structures that join to form new individuals
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Kinds of Fungi
Threadlike FungiMolds- a shapeless, fuzzy fungus
Most live in the soil and are usually decomposers
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Threadlike fungi
Reproduce asexually by forming sporangia, extensions of the hyphae that produce spores
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Threadlike Fungi
Reproduce sexually by hyphae from different individuals join and develop into specialized sporangia
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Sac Fungi
Largest group of fungi, includes yeast, powdery mildew, truffles and morelsReproduces sexually by forming a sac called an ascusSexually produced spores develop within the sac
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Yeast
Most are multicellular but yeasts are single celled
Yeast reproduce asexually by budding, a new cell pinches off from an existing cell
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Uses
Yeast is used for making bread
Truffles and morels are prized edible sac fungi
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Club Fungi
Most familiar group
Umbrella shaped
During sexual reproduction, special hyphae develop and produce clublike structures called basidia
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Club Fungi
Sexual spores develop inside the basidia
The mushroom you know is only the sexual spore forming part of the organism which form at the edge of the mass of hyphae, usually in a circle
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Club Fungi
Most familiar, basidia form in the grooves or gills under the mushroom cap
Other types of club fungi include bracket fungi, puffballs, smuts, and rusts
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Imperfect Fungi
Includes the fungi that doesn’t fit into the other groups
Do not reproduce sexually
Most are parasites that cause disease in plants and animals
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Imperfect Fungi
Athletes foot – fungus on the skinOne kind produces a toxin called aflatoxin, which can cause cancerUsed to make penicillin, cheese, soy sauce and citric acid for soft drinks
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Lichens
Combination of fungus and an alga that grow intertwined and exist in a symbiotic relationship
Producers
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Lichens
Resist drying out because they are protected by the fungi cell wall
Need only water, air and minerals, so they can grow on rocks
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Lichens
They produce acids that break down the rock and cause cracks, which become filled with bits of rock and dead lichens, making soil for other things to grow on
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Lichens
Absorb water and minerals from the air, making them sensitive to air pollution