Podcast
Questions and Answers
Which characteristic is true for protozoa?
Which characteristic is true for protozoa?
- They have a complex body cavity.
- They are divided into cells.
- They are always multicellular.
- They carry out vital functions using organelles. (correct)
What defines mesozoa in comparison to other invertebrates?
What defines mesozoa in comparison to other invertebrates?
- They possess a complex organ system.
- Their bodies have a ciliated outer layer. (correct)
- They have more than two cell layers.
- They are exclusively unicellular.
How is the taxonomic hierarchy structured according to classification systems?
How is the taxonomic hierarchy structured according to classification systems?
- Any taxon can belong to any other taxon.
- Each taxon must belong to the taxon directly above it. (correct)
- A class can belong directly to an order.
- Species are categorized above genus in hierarchy.
What is a significant feature of modern classification systems?
What is a significant feature of modern classification systems?
Which of the following statements about invertebrate classification is correct?
Which of the following statements about invertebrate classification is correct?
Flashcards
Invertebrates
Invertebrates
Organisms that lack a backbone.
Protozoa
Protozoa
Mostly single-celled organisms that carry out vital functions through organelles.
Mesozoa
Mesozoa
Organisms with a cellular body structure, but lacking complex organization, with only two cell layers.
Taxonomy
Taxonomy
A hierarchical system used to classify organisms, based on similarities and relationships.
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Taxa
Taxa
Groups of organisms within a classification system, arranged in a hierarchy (phylum, class, order, family, genus, species).
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Taxon Hierarchy
- Taxons contain other taxons beneath them, e.g., a phylum can contain classes.
- Each taxon belongs to the taxon directly above it in the hierarchy.
Kingdoms
- Five kingdoms are recognised: Prokaryotae, Protoctista, Fungi, Plantae, and Animalia.
- The latter four are part of the Super Kingdom Eukaryotae.
- Protoctista now includes algae, protozoa, and some fungi and slime molds.
- The two-kingdom system (Plantae and Animalia) is no longer sufficient to reflect phylogenetic relationships.
Invertebrate Classification
- Invertebrates are animals without backbones.
- They are divided into four groups based on their cellular composition.
Protozoa
- Mostly unicellular (one-celled).
- Also considered acellular (not divided into cells).
- Organelles carry out functions.
Mesozoa
- Named because they are thought to be intermediate between multicellular animals and single-celled organisms.
- Bodies are cellular.
- Have no more than two cell layers, with the outer layer being ciliated and the inner layer reproductive.
- Bilaterally symmetrical (mirror-image halves).
- Lack organs.
- Lack a body cavity.
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