$$\text{Coelom lining} = \text{mesoderm}$$

$$535\text{–}525\ \text{mya} = \text{Cambrian explosion}$$

$$\text{Blastopore} \rightarrow \text{Mouth}$$

Question 1

Which of the following is a defining characteristic of animals that distinguishes them from fungi and plants?

Accepted Answer

Presence of nervous and muscle tissue

Question 2

The supergroup Unikonta includes which of the following clades?

Accepted Answer

Amoebozoans and Opisthokonts

Question 3

Which protein is unique to animal cells and provides structural support?

Accepted Answer

Collagen

Question 4

Choanoflagellates are considered the closest living relatives to animals based on which evidence?

Accepted Answer

Gene sequence similarities and presence of cadherin proteins

Question 5

Which of the following best describes bilateral symmetry in animals?

Accepted Answer

Body can be divided into mirror-image halves along a single plane

Question 6

A triploblastic animal with a true coelom has a body cavity that is:

Accepted Answer

Surrounded by tissues derived from mesoderm

Question 7

Which equation correctly represents the relationship between the three germ layers in a triploblastic animal?

Accepted Answer

$$	ext{Coelom lining} = 	ext{mesoderm}$$

Question 8

Which developmental process is characteristic of protostome animals?

Accepted Answer

Spiral and determinate cleavage

Question 9

In deuterostome development, the blastopore becomes:

Accepted Answer

The anus

Question 10

Which animal group is characterized by the presence of a lophophore and trochophore larva?

Accepted Answer

Lophotrochozoa

Question 11

Which phylum is described as having segmented bodies, jointed appendages, and an exoskeleton made of protein and chitin?

Accepted Answer

Arthropoda

Question 12

Which of the following is a real-world example of an animal with radial symmetry?

Accepted Answer

Starfish

Question 13

Which equation best represents the timeline of animal evolution, including the Cambrian explosion?

Accepted Answer

$$535	ext{–}525\ 	ext{mya} = 	ext{Cambrian explosion}$$

Question 14

Which animal group lacks tissues and has choanocytes (collar cells) for feeding?

Accepted Answer

Porifera

Question 15

Which of the following statements about coelomates is correct?

Accepted Answer

Their body cavity is completely lined by mesoderm-derived tissue

Question 16

Which phylum includes animals with a water vascular system and five-part body organization as adults?

Accepted Answer

Echinodermata

Question 17

Which of the following is a characteristic of Ecdysozoa?

Accepted Answer

Secretion of external skeletons and molting (ecdysis)

Question 18

Which equation represents the fate of the blastopore in protostome development?

Accepted Answer

$$	ext{Blastopore} ightarrow 	ext{Mouth}$$

Question 19

Which of the following is a real-world example of a pseudocoelomate animal?

Accepted Answer

Rotifer

Question 20

Which of the following best describes the evolutionary significance of Hox genes in animals?

Accepted Answer

They regulate the development of body plans and segmentation

An Overview of Animal Diversity

Study Guide - Practice Questions