Question 1

Which of the following characteristics is unique to animals and distinguishes them from plants and fungi?

Accepted Answer

They obtain nutrients by ingestion and digest food within their bodies.

Question 2

The Cambrian explosion is significant in animal evolution because:

Accepted Answer

It was a rapid diversification of animal body plans, including the emergence of hard body parts.

Question 3

Which of the following is NOT a characteristic of all animals?

Accepted Answer

Ability to photosynthesize

Question 4

Which of the following best describes the difference between protostomes and deuterostomes?

Accepted Answer

In protostomes, the first opening becomes the mouth; in deuterostomes, it becomes the anus.

Question 5

Which of the following is a shared derived character that separates flatworms and molluscs from cnidarians?

Accepted Answer

Three tissue layers (triploblastic development)

Question 6

Which of the following is true about the animal life cycle?

Accepted Answer

Egg and sperm are the only haploid cells in the life cycle.

Question 7

Which of the following statements about animal body symmetry is correct?

Accepted Answer

Animals with bilateral symmetry have distinct anterior, posterior, dorsal, and ventral surfaces.

Question 8

A scientist discovers a new animal species with three tissue layers, a body cavity, and bilateral symmetry. Which group is this animal LEAST likely to belong to?

Accepted Answer

Cnidarians

Question 9

Which of the following best explains why insects are considered a spectacular example of animal diversity?

Accepted Answer

They encompass a wide variety of shapes, sizes, habitats, diets, and mating habits, with over a million named species.

Question 10

Which of the following is NOT used by biologists to hypothesize animal phylogeny?

Accepted Answer

Ability to photosynthesize

Question 11

Which of the following is a correct description of a coelom?

Accepted Answer

A fluid-filled space between the digestive tract and the outer body wall in which internal organs are suspended

Question 12

Which of the following evolutionary events is most closely associated with the increase in animal diversity during the Cambrian explosion?

Accepted Answer

The development of complex predator-prey relationships

Question 13

Which of the following statements about eumetazoans is correct?

Accepted Answer

They include animals with both radial and bilateral symmetry.

Question 14

Which of the following is a correct pairing of tissue layer and its fate in animal development?

Accepted Answer

Mesoderm – forms muscles and internal organs

Question 15

Which of the following is true about the evolutionary relationship between animals and choanoflagellates?

Accepted Answer

Animals evolved from a lineage that diverged from choanoflagellates about 770 million years ago.

Question 16

Which of the following is a defining feature of vertebrates?

Accepted Answer

Presence of a backbone made up of a series of bones

Question 17

A researcher finds a fossil with evidence of hard body parts such as shells and spikes. Based on this, the fossil most likely dates to which period?

Accepted Answer

Cambrian period

Question 18

Which of the following is NOT a plausible reason for the rapid diversification of animals during the Cambrian explosion?

Accepted Answer

Evolution of photosynthesis in animals

Question 19

Which of the following statements about sponges is correct?

Accepted Answer

Sponges lack true tissues.

Question 20

Which of the following is a correct statement about animal embryonic development?

Accepted Answer

In deuterostomes, the blastopore becomes the anus.

The Evolution of Invertebrate Diversity: Animal Evolution and Body Plans

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