Podcast
Questions and Answers
What defines a taxon in biological classification?
What defines a taxon in biological classification?
- A genetic variant within a species.
- A group of organisms that share a specific environment.
- Any named group of organisms classified together based on shared evolutionary traits. (correct)
- A population of organisms living in the same geographic area.
In the context of aquatic animals, what is the difference between macrobenthic and meiobenthic organisms?
In the context of aquatic animals, what is the difference between macrobenthic and meiobenthic organisms?
- Macrobenthic organisms live on the ocean floor, while meiobenthic organisms live within sediments. (correct)
- Both macrobenthic and meiobenthic organisms can only be found in freshwater environments.
- Macrobenthic organisms are primarily planktonic, whereas meiobenthic organisms are primarily herbivores.
- Macrobenthic organisms are smaller and live within sediments, while meiobenthic are larger and live on the ocean floor.
Which of the following correctly describes a mutualistic relationship?
Which of the following correctly describes a mutualistic relationship?
- One organism benefits and the other is not affected.
- The organisms coexist without any interaction.
- Both organisms benefit from the relationship. (correct)
- One organism benefits while the other is harmed.
What is the role of suspension feeders in an aquatic ecosystem?
What is the role of suspension feeders in an aquatic ecosystem?
Which part of a species' scientific name is always capitalized?
Which part of a species' scientific name is always capitalized?
Which type of development is characterized by the absence of a larval stage?
Which type of development is characterized by the absence of a larval stage?
What is a common characteristic of organisms classified as deuterostomes?
What is a common characteristic of organisms classified as deuterostomes?
Which type of symmetry do organisms in the Phylum Cnidaria exhibit?
Which type of symmetry do organisms in the Phylum Cnidaria exhibit?
Which of the following describes organisms that are sessile?
Which of the following describes organisms that are sessile?
What term is used to describe animals that contain a true coelom?
What term is used to describe animals that contain a true coelom?
Which type of body cavity is absent in Acoelomates?
Which type of body cavity is absent in Acoelomates?
Which of the following groups includes organisms that exhibit bilateral symmetry?
Which of the following groups includes organisms that exhibit bilateral symmetry?
Which two groups illustrate distinct differences in mouth formation?
Which two groups illustrate distinct differences in mouth formation?
Flashcards
Multicellular
Multicellular
Organisms made up of many specialized cells.
Unicellular
Unicellular
Organisms made of a single cell with no organelles.
Bilateral symmetry
Bilateral symmetry
Body type where right and left sides are mirror images.
Radial symmetry
Radial symmetry
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Diploblastic
Diploblastic
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Protostomes
Protostomes
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Acoelomate
Acoelomate
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Mobile lifestyle
Mobile lifestyle
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Evolutionary relationship
Evolutionary relationship
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Species Gene pool
Species Gene pool
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Binomial Nomenclature
Binomial Nomenclature
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Symbiotic Relationship
Symbiotic Relationship
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Feeding Types
Feeding Types
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Study Notes
Invertebrate Classification
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Cell Number: Invertebrates can be unicellular or multicellular. Multicellular invertebrates are made of many specialized cells. Unicellular invertebrates consist of a single cell without membrane-bound organelles.
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Body Symmetry:
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Bilateral: Body parts are mirror images of each other (e.g., crustaceans, annelids).
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Radial: Body parts are arranged around a central axis (e.g., Cnidaria like jellyfish, starfish).
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Asymmetrical: Body lacks any symmetry (e.g., Porifera like sponges).
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Developmental Patterns:
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Diploblastic: Only two germ layers (ectoderm and endoderm). Examples include corals, jellyfish, and sponges.
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Triploblastic: Three germ layers (ectoderm, endoderm, and mesoderm). Most invertebrate taxa.
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Acoelomate: Lack a body cavity.
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Pseudocoelomate: Have a body cavity that is not completely lined with mesoderm.
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Coelomate: Have a body cavity completely lined with mesoderm.
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Types of Body Cavity:
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Acoelomate: Lack a body cavity.
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Pseudocoelomate: Body cavity is partially lined with mesoderm.
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Coelomate: Body cavity is fully lined with mesoderm.
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Embryonic Mouth Formation:
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Protostomes: Coelom forms through schizocoely (splitting of mesoderm). Examples include mollusks and annelids.
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Deuterostomes: Coelom forms through enterocoely (outpocketing of archenteron). Examples include echinoderms and chordates.
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Evolutionary Relationships: Species are grouped together based on morphology, genetics, biochemistry, and behavior. Species within a taxon share a common ancestor.
Additional Invertebrate Characteristics
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Habitat and Lifestyle: Invertebrates can be terrestrial, marine, or aquatic. Habitats include intertidal zones, subtidal zones, and open oceans. Invertebrate lifestyle can be mobile, sessile, or sedentary.
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Feeding: Feeding strategies include herbivory, carnivory, suspension feeding, and deposit feeding.
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Symbiotic Relationships: Ectosymbionts live on the surface and endosymbionts live within their hosts. Relationships can be mutualistic, commensalistic, or parasitic.
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Binomial Nomenclature: Uses a two-part scientific name (Genus species.)
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