Question 1

Which of the following is a key evolutionary innovation that first appeared in vertebrates and contributed to their success in capturing prey and evading predators?

Accepted Answer

Jaws and a mineralized skeleton

Question 2

Sponges are considered simple animals because they lack which of the following features?

Accepted Answer

True tissues

Question 3

Which of the following statements best explains why bilateral symmetry is associated with active movement in animals?

Accepted Answer

It enables the concentration of sensory organs at the head end, facilitating directional movement.

Question 4

During the Cambrian explosion, which of the following evolutionary changes contributed to the rapid diversification of animal body plans?

Accepted Answer

The origin of Hox genes and other genetic changes

Question 5

Which of the following is a function of the coelom in bilaterian animals?

Accepted Answer

It cushions suspended organs and acts as a hydrostatic skeleton.

Question 6

A scientist discovers a new animal species with the following characteristics: a segmented body, jointed appendages, and a hard exoskeleton. To which phylum does this animal most likely belong?

Accepted Answer

Arthropoda

Question 7

Which of the following best describes the feeding mechanism of sponges?

Accepted Answer

They filter small food particles from water using choanocytes.

Question 8

Which germ layer is responsible for forming muscles and most internal organs in bilaterally symmetrical animals?

Accepted Answer

Mesoderm

Question 9

Which of the following is NOT a derived characteristic shared by all chordates at some point in their development?

Accepted Answer

Jointed appendages

Question 10

Which of the following evolutionary adaptations allowed amniotes to successfully colonize terrestrial environments?

Accepted Answer

The evolution of the amniotic egg

Question 11

Which of the following best explains why the cuticle is a critical adaptation for terrestrial arthropods?

Accepted Answer

It prevents desiccation and provides structural support.

Question 12

Which of the following is a correct sequence of evolutionary innovations in animal evolution?

Accepted Answer

Tissues → Bilateral symmetry → Jaws → Amniotic egg

Question 13

Which of the following is a plausible explanation for the decline of the Ediacaran biota during the Cambrian explosion?

Accepted Answer

Novel adaptations in Cambrian predators selected against soft-bodied species

Question 14

Which of the following statements about cnidarians is TRUE?

Accepted Answer

They possess a noncentralized nerve net and simple muscles.

Question 15

Which of the following best describes the evolutionary relationship between choanoflagellates and animals?

Accepted Answer

Animals evolved from a choanoflagellate-like ancestor, as supported by similarities in cell structure and DNA sequences.

Question 16

Which of the following is a real-world example of how Hox gene changes can impact animal evolution?

Accepted Answer

The evolution of complex body regions in arthropods specialized for different tasks

Question 17

Which of the following is a defining feature of bilaterians that distinguishes them from cnidarians?

Accepted Answer

Presence of a mesoderm

Question 18

Which of the following is a function of amoebocytes in sponges?

Accepted Answer

They use pseudopodia to move and distribute nutrients throughout the body.

Question 19

Which of the following best describes the significance of the Cambrian explosion in animal evolution?

Accepted Answer

It was a period of rapid diversification of animal body plans and the origin of most major animal phyla.

Question 20

Which of the following is a correct statement about the function of pharyngeal slits in chordates?

Accepted Answer

They function in suspension feeding, as gills, or as parts of the head in different chordate groups.

The Rise of Animal Diversity: Evolution, Body Plans, and Major Animal Groups

Study Guide - Practice Questions

Study Guide - Flashcards