Question 1

Which of the following statements best describes sponges (Phylum Porifera)?

Accepted Answer

They are basal animals lacking true tissues and organs.

Question 2

Cnidarians are characterized by all of the following EXCEPT:

Accepted Answer

Being triploblastic with a true coelom.

Question 3

Which animal phylum exhibits the widest range of animal body forms?

Accepted Answer

Arthropoda

Question 4

Members of the phylum Arthropoda are considered triploblastic. What does this mean?

Accepted Answer

They have three embryonic tissue layers: ectoderm, mesoderm, and endoderm.

Question 5

Which of the following is a benefit provided by the exoskeleton in arthropods?

Accepted Answer

It provides protection and support for muscle attachment.

Question 6

Which two groups are collectively known as lophophorates?

Accepted Answer

Brachiopods and Ectoprocts

Question 7

Which of the following is NOT a characteristic of phylum Mollusca?

Accepted Answer

They have a segmented body plan.

Question 8

Which class of Mollusca includes animals such as squids and octopuses, and is characterized by a reduced or internal shell?

Accepted Answer

Cephalopoda

Question 9

Which of the following best describes the process of ecdysis in Nematoda and Arthropoda?

Accepted Answer

The shedding of the cuticle to allow for growth.

Question 10

Which of the following is a major characteristic of annelids?

Accepted Answer

They have a segmented body plan.

Question 11

Which of the following is NOT a modern lineage of arthropods?

Accepted Answer

Echinoderms

Question 12

Which of the following best distinguishes complete metamorphosis from incomplete metamorphosis in arthropods?

Accepted Answer

Complete metamorphosis includes a larval stage that looks very different from the adult.

Question 13

Echinoderms and chordates are both members of which larger animal group?

Accepted Answer

Deuterostomia

Question 14

Which of the following is a unique characteristic of chordates?

Accepted Answer

Presence of a notochord at some stage of development.

Question 15

A marine biologist discovers an animal with a segmented body, jointed appendages, and a hard exoskeleton. Which phylum does this animal most likely belong to?

Accepted Answer

Arthropoda

Question 16

Which of the following is an example of a bivalve mollusc?

Accepted Answer

Clam

Question 17

Which of the following statements about nematodes is TRUE?

Accepted Answer

They possess a pseudocoelom and a tough cuticle.

Question 18

Which of the following is a characteristic shared by all echinoderms?

Accepted Answer

A water vascular system used for locomotion.

Question 19

Which of the following equations best represents the relationship between surface area ($$A) $$and volume ($$V) $$for a spherical animal cell, and why is this relationship important for animal physiology?

Accepted Answer

$$A = 4\pi r^2$ and V$$ = \frac{4}{3}\pi $$r^3$$; as size increases, volume increases faster than surface area, limiting exchange with the environment.

Question 20

A scientist is studying an unknown animal that has a trochophore larval stage, a muscular foot, and a mantle. To which phylum does this animal most likely belong?

Accepted Answer

Mollusca

Chapter 33: An Introduction to Invertebrates - Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards