Question 1

Which of the following is a unique characteristic of animals that distinguishes them from plants and fungi?

Accepted Answer

They possess nervous and muscle tissues.

Question 2

During animal development, what is the correct sequence of stages from fertilization to the formation of embryonic tissue layers?

Accepted Answer

Zygote → Cleavage → Blastula → Gastrulation

Question 3

Which of the following statements about Hox genes is correct?

Accepted Answer

Hox genes regulate the expression of other genes that influence animal morphology.

Question 4

The Cambrian explosion is significant in animal evolution because it marks:

Accepted Answer

A period of rapid animal diversification and the appearance of most major animal phyla.

Question 5

Which of the following best describes the difference between protostome and deuterostome development?

Accepted Answer

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

Question 6

Which of the following is NOT a function of a coelom in triploblastic animals?

Accepted Answer

Serving as the main site of photosynthesis

Question 7

A researcher discovers a new animal species that is sessile, lacks true tissues, and has no body symmetry. To which group does this animal most likely belong?

Accepted Answer

Porifera

Question 8

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

Accepted Answer

Bilaterally symmetrical animals usually have a central nervous system and move actively.

Question 9

Which germ layer gives rise to the lining of the digestive tract in animals?

Accepted Answer

Endoderm

Question 10

A fossil from the Ediacaran biota is found to have a soft body and no evidence of hard parts. Which era does this fossil most likely date to?

Accepted Answer

Neoproterozoic

Question 11

Which of the following is a defining feature of Ecdysozoa?

Accepted Answer

Shedding of an external skeleton (ecdysis)

Question 12

Which of the following statements about animal phylogeny is supported by molecular and morphological evidence?

Accepted Answer

Sponges are the sister group to all other animals.

Question 13

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

Accepted Answer

Choanoflagellates are the closest living relatives to animals.

Question 14

Which of the following best describes the function of the mesoderm in triploblastic animals?

Accepted Answer

It gives rise to muscles and most internal organs.

Question 15

A marine biologist finds an animal with a crown of ciliated tentacles used for feeding and a trochophore larval stage. To which clade does this animal most likely belong?

Accepted Answer

Lophotrochozoa

Question 16

Which of the following is a correct statement about the fate of the blastopore in animal development?

Accepted Answer

In protostomes, the blastopore becomes the mouth.

Question 17

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

Accepted Answer

Cell walls made of chitin

Question 18

Which of the following evolutionary events is associated with the decline of the Ediacaran biota?

Accepted Answer

The evolution of Hox gene complexes and micro RNAs

Question 19

Which of the following is a real-world example of a body cavity functioning as a hydrostatic skeleton?

Accepted Answer

The fluid-filled coelom of an earthworm enabling movement

Question 20

Which of the following best explains why bilateral symmetry is advantageous for animals that actively move and hunt?

Accepted Answer

It allows for the development of a central nervous system and concentration of sensory organs at the anterior end.

Introduction to Animal Diversity (Chapter 32): Structure, Evolution, and Classification

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