Question 1

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

Accepted Answer

Presence of nervous tissue

Question 2

Which of the following best describes the evolutionary origin of animals?

Accepted Answer

Animals evolved from a protist similar to choanoflagellates

Question 3

Which of the following feeding modes is correctly matched with its example?

Accepted Answer

Suspension feeding – barnacle filtering plankton

Question 4

Which of the following statements about animal movement is correct?

Accepted Answer

Muscle tissue is unique to animals and enables most to move

Question 5

During which geological period did the Cambrian explosion occur, resulting in a rapid increase in animal diversity?

Accepted Answer

Cambrian

Question 6

Which of the following is NOT a characteristic of animals?

Accepted Answer

Autotrophic nutrition

Question 7

What is the main function of Hox genes in animals?

Accepted Answer

Pattern the body axis during development

Question 8

Which of the following best explains why metamorphosis is advantageous for some animal species?

Accepted Answer

It reduces competition between juvenile and adult forms

Question 9

Which of the following body plans is characterized by having three germ layers?

Accepted Answer

Triploblastic

Question 10

Which of the following statements about animal symmetry is correct?

Accepted Answer

Bilaterally symmetric animals have cephalization

Question 11

A scientist discovers a new animal species with a body cavity completely lined by mesoderm. Which term best describes this animal?

Accepted Answer

Coelomate

Question 12

Which of the following evolutionary innovations is associated with the Cambrian explosion?

Accepted Answer

Evolution of shells and hard body parts

Question 13

Which of the following is a correct match between a germ layer and the structure it forms?

Accepted Answer

Mesoderm – muscles of the body wall

Question 14

Which of the following is a plausible reason for the increase in animal diversity during the Cambrian period?

Accepted Answer

Evolutionary arms race between predators and prey

Question 15

Which of the following statements about animal phylogeny is correct?

Accepted Answer

Animals are monophyletic, sharing a common ancestor

Question 16

Which of the following is a function of the extracellular matrix in animals?

Accepted Answer

Provides structural support and binds cells together

Question 17

A roundworm (phylum Nematoda) has a body cavity that is not completely lined by mesoderm. What is this type of body cavity called?

Accepted Answer

Pseudocoelom

Question 18

Which of the following best describes the function of tight junctions in animal cells?

Accepted Answer

Hold cells together and prevent leakage of extracellular fluid

Question 19

Which of the following is a real-world example of how animal movement is essential for survival?

Accepted Answer

A bear chasing and catching fish for food

Question 20

Which of the following statements about animal reproduction is correct?

Accepted Answer

Most animals reproduce sexually, with small, mobile sperm and large eggs

Animal Diversity: Origins, Characteristics, and Body Plans

Study Guide - Practice Questions