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Animal Phylogeny and Evolution Quiz

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Questions and Answers

What distinguishes bilaterians from sponges?

Formation of a gastrula during early development

Presence of well-defined tissues (correct)

Presence of bilateral symmetry

Development from three germ layers

What is a characteristic feature of most vertebrates?

Development from only one germ layer

Absence of a bony cranium

Possession of a vertebral column (correct)

Presence of radial symmetry

When did animals first evolve according to the text?

100 million years ago

600 million years ago (correct)

200 million years ago

1 billion years ago

What differentiates cnidarians from sponges?

Presence of well-defined tissues Signup and view all the answers

What is a defining characteristic of protostomes and deuterostomes?

Development from two germ layers Signup and view all the answers

Which phylum contains jellyfish and sea anemones according to the text?

Cnidarians Signup and view all the answers

What type of symmetry do sponges typically display?

Irregular form with no plane of symmetry Signup and view all the answers

Why is cephalization considered an adaptation for locomotion?

To concentrate nervous system tissue and sense organs for quick processing of sensory information Signup and view all the answers

What distinguishes animals showing bilateral symmetry?

They have a distinct head and tail with a single plane of symmetry Signup and view all the answers

How does radial symmetry benefit animals like jellyfish and sea anemones?

It permits them to wave their food-gathering tentacles in all directions at once Signup and view all the answers

What is the significance of having sensory organs near the brain due to cephalization?

It aids in processing sensory information quickly for behavioral responses Signup and view all the answers

Why do crabs and alligators possess complex organs specialized for various functions?

For improved digestion and gas exchange Signup and view all the answers