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Taxonomy and Classification of Living Organisms

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Taxonomy and Classification of Living Organisms

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Questions and Answers

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?

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?

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?

<p>They incorporate phylogenetic relationships.</p> Signup and view all the answers

Which of the following statements about invertebrate classification is correct?

<p>Taxa such as genus and species are part of a hierarchical classification system.</p> Signup and view all the answers

Study Notes

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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Description

Explore the hierarchical classification of living organisms in this quiz focused on taxons, kingdoms, invertebrate classification, and protozoa. Learn about the five kingdoms and the distinctions between unicellular and multicellular organisms. Test your understanding of biological taxonomy and the relationships between species.