Question 1

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

Accepted Answer

Ingesting food and lacking cell walls

Question 2

The Cambrian explosion is significant in animal evolution because:

Accepted Answer

Most major animal groups first appear in the fossil record during this time

Question 3

Which of the following is a correct match between animal group and its embryonic tissue layers?

Accepted Answer

Flatworms – triploblastic

Question 4

A scientist discovers a new animal species that is multicellular, lacks cell walls, and has a nervous system organized as a nerve net. Which phylum is this animal most likely to belong to?

Accepted Answer

Cnidaria

Question 5

Which of the following best describes the evolutionary advantage of bilateral symmetry and cephalization in animals?

Accepted Answer

Facilitates directed movement and concentration of sensory organs at one end

Question 6

During embryonic development, the blastopore becomes the mouth in which group of animals?

Accepted Answer

Protostomes

Question 7

Which of the following statements about the coelom is TRUE?

Accepted Answer

It allows internal organs to move independently of the body wall

Question 8

A researcher is studying an animal that grows by shedding its external skeleton. This animal most likely belongs to which group?

Accepted Answer

Ecdysozoans

Question 9

Which of the following is an example of a hydrostatic skeleton?

Accepted Answer

The fluid-filled body cavity of an earthworm

Question 10

Which of the following best explains why sexual reproduction is favored in variable or unfavorable environments?

Accepted Answer

It increases genetic diversity, allowing populations to adapt to changing conditions

Question 11

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

Accepted Answer

Acting as the main site of photosynthesis

Question 12

Which of the following is a correct pairing of animal group and feeding strategy?

Accepted Answer

Butterflies – fluid feeders

Question 13

Which of the following is a plausible explanation for the rapid diversification of animal body plans during the Cambrian explosion?

Accepted Answer

The evolution of Hox genes and increased ecological interactions

Question 14

Which of the following is a real-world example of an animal with indirect development involving metamorphosis?

Accepted Answer

A caterpillar transforming into a butterfly

Question 15

Which of the following statements about segmentation in animals is correct?

Accepted Answer

Segmentation allows for specialization of body regions

Question 16

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

Accepted Answer

Choanoflagellates are the closest living relatives of animals

Question 17

Which of the following is a key difference between diploblastic and triploblastic animals?

Accepted Answer

Triploblastic animals have three germ layers, diploblastic animals have two

Question 18

Which of the following is an example of a viviparous animal?

Accepted Answer

A human giving birth to live young nourished by a placenta

Question 19

Which of the following is a specialized sensory ability that evolved in some animals and is used for navigation?

Accepted Answer

Detection of magnetic fields

Question 20

A marine biologist observes an animal that is sessile as an adult, feeds by filtering particles from water, and can reaggregate after being dissociated. Which phylum does this animal most likely belong to?

Accepted Answer

Porifera

Chapter 30: An Introduction to Animals – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards