Question 1

Which of the following is a unique characteristic of animals compared to plants and fungi?

Accepted Answer

They possess muscle and nerve cells.

Question 2

During which geologic eon did the first animals evolve, as evidenced by fossil records?

Accepted Answer

Proterozoic Eon

Question 3

What is the main function of the coelom in animals?

Accepted Answer

It separates the digestive tract from the outer body wall, providing structural support and facilitating transport of nutrients, gases, and wastes.

Question 4

Which of the following statements about animal reproduction is correct?

Accepted Answer

Animals can reproduce both sexually and asexually, and the zygote is typically diploid.

Question 5

Which of the following best describes the Cambrian explosion?

Accepted Answer

A rapid diversification of animal body plans, with half of all extant animal phyla appearing in the fossil record.

Question 6

Which germ layer gives rise to the muscles and circulatory system in triploblastic animals?

Accepted Answer

Mesoderm

Question 7

A newly discovered animal has bilateral symmetry, a true coelom, and undergoes spiral, determinate cleavage during development. To which group does it most likely belong?

Accepted Answer

Protostomes

Question 8

Which of the following is a correct sequence of embryonic development in animals?

Accepted Answer

Zygote → Blastula → Gastrula → Larva

Question 9

Which of the following statements about the evolution of animals is supported by fossil evidence?

Accepted Answer

Steroids produced by sponges have been found in fossils dating back to 710 million years ago.

Question 10

Which of the following is a defining feature of deuterostome development?

Accepted Answer

Radial and indeterminate cleavage

Question 11

Which of the following best explains why animals are considered heterotrophs?

Accepted Answer

They ingest, digest, and then absorb nutrients from other organisms.

Question 12

A scientist discovers a multicellular organism with no cell wall, supported by collagen, and capable of movement. Which kingdom does this organism most likely belong to?

Accepted Answer

Animalia

Question 13

Which of the following is true about the body symmetry of animals?

Accepted Answer

Bilateral symmetry is associated with the development of a head and directional movement.

Question 14

Which of the following statements about metamorphosis is correct?

Accepted Answer

It is a transformation from a larval stage to an adult stage, often involving significant morphological changes.

Question 15

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

Accepted Answer

Serving as a site for photosynthesis

Question 16

Which of the following best describes the difference between diploblastic and triploblastic animals?

Accepted Answer

Diploblastic animals have only ectoderm and endoderm; triploblastic animals have ectoderm, mesoderm, and endoderm.

Question 17

Which of the following is a real-world example of metamorphosis in animals?

Accepted Answer

A frog developing from a tadpole to an adult frog.

Question 18

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

Accepted Answer

Animal cells and choanoflagellates share similar cadherin proteins, suggesting a close evolutionary relationship.

Question 19

Which of the following is a correct statement about the fate of the blastopore in protostomes and deuterostomes?

Accepted Answer

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

Question 20

Which of the following best explains why cell signaling is important in multicellular animals?

Accepted Answer

It enables cells to communicate and coordinate activities necessary for development and function.

Introduction to Animal Diversity (Ch. 32): Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards