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 serves as a major extracellular structural protein?

Accepted Answer

Collagen

Question 3

During early animal development, which process leads to the formation of the three embryonic tissue layers in triploblasts?

Accepted Answer

Gastrulation

Question 4

Which of the following body plans is associated with bilateral symmetry?

Accepted Answer

Flatworms

Question 5

Which feature is used to categorize animals into major groups?

Accepted Answer

All of the above

Question 6

Which group of animals lacks true tissues?

Accepted Answer

Sponges

Question 7

Which of the following statements about Porifera (sponges) is TRUE?

Accepted Answer

They are sessile as adults

Question 8

Cnidarians are unique among animals because they:

Accepted Answer

Have only one digestive system opening

Question 9

Which of the following is a function of choanocytes in sponges?

Accepted Answer

Movement of water through the sponge body

Question 10

Which animal group is considered to have an asymmetric body plan?

Accepted Answer

Sponges

Question 11

Which of the following is NOT a characteristic of Cnidarians?

Accepted Answer

Segmented body plan

Question 12

Which of the following best describes the nervous system of a cnidarian?

Accepted Answer

Randomly distributed neural network

Question 13

Which of the following is a reason why sequential hermaphroditism is advantageous in sponges?

Accepted Answer

It prevents self-fertilization and increases genetic diversity

Question 14

Which of the following is TRUE about the Hydra?

Accepted Answer

It is a freshwater cnidarian that exists only in polyp form

Question 15

Which of the following is a defining feature of annelids?

Accepted Answer

Segmented body plan

Question 16

Which of the following statements about flatworms is FALSE?

Accepted Answer

They have two digestive system openings

Question 17

Which of the following is a correct sequence of early animal development in triploblasts?

Accepted Answer

Zygote → Cleavage → Blastula → Gastrulation → Three germ layers

Question 18

Which of the following is NOT a feature used to categorize animals?

Accepted Answer

Number of mitochondria

Question 19

Which group is considered the first eumetazoans with true tissues?

Accepted Answer

Cnidarians

Question 20

Which of the following statements about ctenophores is TRUE?

Accepted Answer

They have more cell types than sponges and a rudimentary nervous system

Animal Diversity: Introduction and Survey of Major Invertebrate Groups

Study Guide - Practice Questions