Question 1

Which of the following is NOT a key characteristic of metazoans (animals)?

Accepted Answer

They have cell walls made of cellulose

Question 2

Which protein is the most abundant in animal bodies and provides extracellular structural support?

Accepted Answer

Collagen

Question 3

Which of the following statements about animal development is TRUE?

Accepted Answer

Diploblasts typically exhibit radial symmetry

Question 4

Which feature is used to categorize animals into major groups?

Accepted Answer

All of the above

Question 5

Which animal group is characterized by having no true tissues?

Accepted Answer

Sponges (Porifera)

Question 6

Which of the following best describes the body plan of sponges?

Accepted Answer

Asymmetry

Question 7

Which of the following is a unique feature of cnidarians?

Accepted Answer

Cnidocytes for stinging, entangling, or gripping

Question 8

Why are most sponges considered 'just barely animals'?

Accepted Answer

They lack tissues but have specialized cells

Question 9

Which of the following is TRUE about the nervous system in sponges?

Accepted Answer

They have no nervous system, but individual cells have some nerve cell machinery

Question 10

Which group of animals is the first to have true tissues and radial symmetry?

Accepted Answer

Cnidarians

Question 11

Which of the following is a characteristic of flatworms?

Accepted Answer

Bilateral symmetry

Question 12

Which animal group is known for its extraordinary regenerative ability and is important in regenerative medicine research?

Accepted Answer

Cnidarians (Hydra)

Question 13

Which of the following is NOT a feature used to categorize animal body plans?

Accepted Answer

Type of circulatory system

Question 14

Which of the following statements about the evolutionary tree of animals is correct?

Accepted Answer

The tree shows only about one-third of all known phyla

Question 15

Which of the following is TRUE about the digestive system of cnidarians?

Accepted Answer

They have only one digestive system opening

Question 16

Which of the following is a defining feature of annelids?

Accepted Answer

Segmented body plan

Question 17

Which of the following best describes the difference between diploblasts and triploblasts?

Accepted Answer

Diploblasts have two germ layers; triploblasts have three

Question 18

Which of the following is a correct statement about the evolutionary relationship between Porifera and Ctenophora?

Accepted Answer

There is ongoing debate about which group diverged first

Question 19

Which of the following is TRUE about the nervous system of Ctenophores?

Accepted Answer

They have a rudimentary nervous system

Question 20

Which of the following is a reason why the term 'invertebrate' is sometimes avoided by scientists?

Accepted Answer

It refers to a paraphyletic group

Animal Diversity: Introduction to Invertebrates and Body Plans

Study Guide - Practice Questions