7ch8 protists - bement.k12.il.us
TRANSCRIPT
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7ch8Protists
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Protists - a member of a group of eukaryotic organisms, which have a membrane bound nucleus.
● protists are a diverse group with many different adaptations
● share some characteristics with plants, animals, fungi
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Reproduction
Most reproduce asexually - exact copy of the parent
Some reproduce sexually - genetically different from the parent
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Classification
A protist is any eukaryote that cannot be classified as a plant, an animal, or a fungus.
Protists are classified as plantlike, animal-like, or funguslike
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Plantlike Protists
Diatoms - microscopic plantlike protist with a hard outer wall
● very common,● diatoms look like colored glass - their cell walls contain
silica
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Plantlike Protists
Dinoflagellates - protists with a flagella so it can
move around, some glow in the dark
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Plantlike Protists
Euglenoids - instead of a cell wall, they have a rubbery cell coat, a flagellum, eyespots that detect light, and chloroplasts to make their own food
prey for tadpoles and small fish
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Plantlike Protists
Algae are plantlike protists that produce food through photosynthesis using light energy and carbon dioxide.
Some are large and multicellular, most are small, unicellular
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Algae
Classified as Red, Green, or Brown
Red and brown appear similar to plants,
● have holdfasts to attach to rocks instead of roots● do not have a complex system for water transport like
plants
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Green Algae
Volvox - many volvox cells come together to form a large sphere and function as a group
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Importance of Algae
Ingredient of foods like ice cream, pudding, marshmallows
Important in the ecosystem - provide food and shelter
- remove pollution from water
Problems in ecosystem - can overpopulate and produce wastes that poison other organisms often called a red tide algal bloom
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Animal-like Protists
Protozoans - protists that resemble tiny animals
● do not have chloroplasts● microscopic and unicellular● most live in wet environments
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Ciliates
Cilia - short, hairlike structures that grow on the surface of some protists
Paramecium - protist with cilia and two types of nuclei
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Flagellates
● uses flagella to move● eat decaying matter● many live in the digestive of animals
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Sarcodines
Animal-like protists with no specific shape
Amoeba - common, with an adaption for movement
Pseudopod - a temporary “foot” that forms as the
organism pushes part of its body outward.
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Sarcodines get nutrients and energy by:
● ingesting other organisms● make their own food● live in the digestive system of humans
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Importance of Protozoans
Decompose dead plant and animal matter
Cause disease as parasites
Example: malaria p. 272
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Funguslike Protists
Slime and Water Molds
Slime molds - cell material floating in a slimy mass
- absorb nutrients from other organic matter
Water mold - feeds on dead organisms or as a parasite
- often causes diseases in plants
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Importance of Funguslike Protists
Decompose dead organic matter
Many attack and consume living plants
Example: Great Irish Potato Famine in 1845
destroyed over half of the potato crop
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Lesson 2 Fungi
● World’s largest organism● Eukaryotes● 1.5 million species● heterotrophs - cannot make their own food● decompose organic matter by dissolving it with chemicals ● some are parasites
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Hyphae - threadlike structures usually underground that
absorb minerals and water
Mycelium - a network of hyphae
p. 277
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Types of Fungi
Classified by appearance and type of reproduction structures
Can reproduce sexually and asexually
Almost all reproduce asexually by spores
Spores - small, reproductive cells with a strong outer
covering
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Types of Fungi
Club Fungi - named for their various shapes, characteristics
Puffballs p.276
Stinkhorns
Bird’s nest fungus p.278
Mushrooms
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Mushrooms - named for their clublike structure above ground
called a basidiocarp.
Basidia - reproductive structures inside the basidiocarp
that produce sexual spores
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Sac Fungi
named for their reproductive structures - spores develop on a structure that looks like a sack (ascus)
Ascus - structure where spores develop
common types: yeast, diaper rash,
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Zygote Fungi
Have stalks called zygosporangia that release spores
Example: bread mold,
fungi in damp places like a damp basement or a
shower curtain
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Imperfect Fungi
No sexual reproductive stage
Examples: athlete’s foot
blue cheese - the blue color comes from fungi
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Importance of Fungi
Used in the production of many food products
Cheese, bread, soda, chocolate, meat substitute
Make antibiotics
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Importance of Fungi - Decomposers
Fungi break down organic matter for food
● By decomposing dead organic matter, they recycle nutrients in the soil
● Fungi also break down pollution, including pesticides in the soil
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Fungi and Plant Roots
Many plants and fungi grow together
The roots of plants and the hyphae of fungi weave together to form a structure called mycorrhiza
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MycorrhizaExchange molecules: fungi break down decaying matter in the soil and provide some of these nutrients to the plant
The plant provides some sugar from photosynthesis to the hyphae of the fungus
The hyphae also increase the plant’s ability to absorb water
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Health and Medicine
Fungi can make you sick: athlete’s foot, rashes, allergies, pneumonia, thrush.
Fungi can also be used to make medicine: penicillin
The fungus penicillium restricts bacterial growth
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Lichens
A structure formed when fungi and certain other photosynthetic organisms grow together.
Usually a sac or club fungus that lives together with a green algae or a photosynthetic bacterium.
The fungus’ hyphae grow in a layer around the algae cells
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Benefits of Lichens
● Can survive harsh environments - fungus provides water and nutrients, algae can make food from photosynthesis.
● Food for other organisms● Create soil
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