17 Questions
What role do funguslike protists play in the ecosystem?
They break down dead plant and animal matter, making the nutrients available for living organisms.
Why do slime molds and water molds usually reproduce sexually?
When environmental conditions are harsh or unfavorable
The Irish Potato Famine was caused by a funguslike protist.
True
What is a protist?
A member of a group of eukaryotic organisms with a membrane-bound nucleus.
How do most protists reproduce?
Asexually
How are algae classified based on pigments?
Algae are classified as red, green, or brown based on the pigments they contain.
Protozoans are multicellular organisms.
False
Cilia are short, hairlike structures that grow on the surface of some protists. Protists with these organelles are called __________.
ciliates
Match the plant-like protists with their descriptions:
Diatoms = Microscopic plantlike protist with hard outer wall Dinoflagellates = Unicellular plantlike protist with flagella for movement Euglenoids = Unicellular plantlike protist with chloroplasts and flagellum Algae = Photosynthetic plantlike protists producing food through photosynthesis
What role do funguslike protists play in the ecosystem?
They break down dead plant and animal matter, making the nutrients available for living organisms.
What was the cause of the Great Irish Potato Famine?
Funguslike protists
Many funguslike protists are beneficial for the environment.
False
What is a protist?
A protist is a member of a group of eukaryotic organisms with a membrane-bound nucleus.
How do most protists reproduce?
Asexually
What is the main classification basis for protists?
Similarities in structure
Animal-like protists have chloroplasts for photosynthesis.
False
_______ are plantlike protists that produce food through photosynthesis.
Algae
Study Notes
What are Protists?
- Protists are a group of eukaryotic organisms with a membrane-bound nucleus.
- They share characteristics with plants, animals, or fungi, but are not classified as any of these groups.
- Protists are diverse and have different adaptations for movement and finding food.
Reproduction of Protists
- Most protists reproduce asexually, creating an exact copy of the parent.
- Asexual reproduction can create new organisms quickly.
- Many protists can also reproduce sexually, creating offspring with genetic differences.
- Sexual reproduction takes more time, but creates new organisms with varied characteristics.
Classification of Protists
- Protists are classified as plant-like, animal-like, or fungus-like based on their similarities.
- Scientists classify protists based on their characteristics, but they are a unique and diverse group.
Plant-like Protists
- Algae are plant-like protists that produce food through photosynthesis.
- Diatoms are a type of microscopic plant-like protist with a hard outer wall.
- Dinoflagellates are unicellular plant-like protists with flagella that enable them to move.
- Euglenoids are unicellular plant-like protists with a flagellum and eyespots that detect light.
- Algae are classified as red, green, or brown, depending on their pigments.
Importance of Algae
- Algae provide food for animals and animal-like protists.
- They provide shelter for many aquatic organisms.
- Algae help remove pollution from the water, but excess algae can produce wastes that poison other organisms.
Animal-like Protists
- Protozoans are protists that resemble tiny animals.
- They do not have chloroplasts or make their own food.
- Protozoans are usually microscopic and unicellular.
- Ciliates are protists with short, hairlike structures called cilia that enable them to move.
- Flagellates are protists with one or more flagella that enable them to move.
- Sarcodines are protists with no specific shape that can ooze into any shape.
Importance of Protozoans
- Protozoans break down dead plant and animal matter, recycling nutrients back into the environment.
- Some protozoans can cause disease by acting as parasites.
Fungus-like Protists
- Fungus-like protists share characteristics with fungi, but are classified as protists.
- Slime molds are fungus-like protists that absorb nutrients from their environment.
- Water molds are fungus-like protists that live as parasites or feed on dead organisms.
Importance of Fungus-like Protists
- Fungus-like protists break down dead plant and animal matter, making nutrients available for living organisms.
- While some are beneficial, many can be harmful and attack living plants.
What are Protists?
- Protists are a group of eukaryotic organisms with a membrane-bound nucleus.
- They share characteristics with plants, animals, or fungi, but are not classified as any of these groups.
- Protists are diverse and have different adaptations for movement and finding food.
Reproduction of Protists
- Most protists reproduce asexually, creating an exact copy of the parent.
- Asexual reproduction can create new organisms quickly.
- Many protists can also reproduce sexually, creating offspring with genetic differences.
- Sexual reproduction takes more time, but creates new organisms with varied characteristics.
Classification of Protists
- Protists are classified as plant-like, animal-like, or fungus-like based on their similarities.
- Scientists classify protists based on their characteristics, but they are a unique and diverse group.
Plant-like Protists
- Algae are plant-like protists that produce food through photosynthesis.
- Diatoms are a type of microscopic plant-like protist with a hard outer wall.
- Dinoflagellates are unicellular plant-like protists with flagella that enable them to move.
- Euglenoids are unicellular plant-like protists with a flagellum and eyespots that detect light.
- Algae are classified as red, green, or brown, depending on their pigments.
Importance of Algae
- Algae provide food for animals and animal-like protists.
- They provide shelter for many aquatic organisms.
- Algae help remove pollution from the water, but excess algae can produce wastes that poison other organisms.
Animal-like Protists
- Protozoans are protists that resemble tiny animals.
- They do not have chloroplasts or make their own food.
- Protozoans are usually microscopic and unicellular.
- Ciliates are protists with short, hairlike structures called cilia that enable them to move.
- Flagellates are protists with one or more flagella that enable them to move.
- Sarcodines are protists with no specific shape that can ooze into any shape.
Importance of Protozoans
- Protozoans break down dead plant and animal matter, recycling nutrients back into the environment.
- Some protozoans can cause disease by acting as parasites.
Fungus-like Protists
- Fungus-like protists share characteristics with fungi, but are classified as protists.
- Slime molds are fungus-like protists that absorb nutrients from their environment.
- Water molds are fungus-like protists that live as parasites or feed on dead organisms.
Importance of Fungus-like Protists
- Fungus-like protists break down dead plant and animal matter, making nutrients available for living organisms.
- While some are beneficial, many can be harmful and attack living plants.
Learn about protists, a group of eukaryotic organisms with diverse characteristics, adaptations, and reproductive methods. Discover how they reproduce and thrive.
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