Question 1

Which of the following characteristics is generally true for all animals, but has exceptions among certain groups?

Accepted Answer

They are all heterotrophic eukaryotes that ingest their food.

Question 2

Which of the following best describes the difference between protostome and deuterostome development during cleavage?

Accepted Answer

Protostome cleavage is spiral and determinate, while deuterostome cleavage is radial and indeterminate.

Question 3

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

Accepted Answer

Coelomate

Question 4

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

Accepted Answer

Zygote → Morula → Blastula → Gastrula

Question 5

Which of the following statements about animal body symmetry is correct?

Accepted Answer

Radial symmetry allows for division into mirror-image halves along any plane through the central axis.

Question 6

In protostome development, what does the blastopore become?

Accepted Answer

The mouth

Question 7

Which of the following is a function of the hemocoel in animals that possess it?

Accepted Answer

It transports nutrients and waste, analogous to blood.

Question 8

Which group of animals is characterized by having two germ layers during development?

Accepted Answer

Cnidarians

Question 9

A scientist observes an animal that undergoes a larval stage morphologically distinct from the adult. What is the evolutionary advantage of this life cycle?

Accepted Answer

It reduces competition for resources between larvae and adults.

Question 10

Which of the following statements about coelom formation is correct?

Accepted Answer

In protostomes, the coelom forms from solid masses of mesoderm that split.

Question 11

Which of the following is a synapomorphy of Eumetazoa?

Accepted Answer

Presence of true tissues

Question 12

Which of the following best describes the difference between a coelomate and an acoelomate animal?

Accepted Answer

Coelomates have a body cavity completely lined by mesoderm, while acoelomates lack a body cavity.

Question 13

Which of the following is true about the Ecdysozoa clade?

Accepted Answer

Members secrete an exoskeleton and grow by shedding the old skeleton.

Question 14

Which of the following is a defining feature of the Lophotrochozoa?

Accepted Answer

Presence of a trochophore larva or a lophophore feeding structure

Question 15

Which of the following best explains why identical twins are possible in deuterostomes but not in protostomes?

Accepted Answer

Deuterostome development is indeterminate, so early cells can each develop into a complete embryo.

Question 16

Which of the following is NOT a characteristic used to define the animal body plan?

Accepted Answer

Ability to photosynthesize

Question 17

Which of the following statements about germ layers is correct?

Accepted Answer

Triploblastic animals have three germ layers: ectoderm, mesoderm, and endoderm.

Question 18

A researcher is studying an animal with bilateral symmetry, three germ layers, and a true coelom. Which of the following groups could this animal belong to?

Accepted Answer

Chordata

Question 19

Which of the following best describes the fate of the blastopore in deuterostome development?

Accepted Answer

It becomes the anus.

Question 20

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

Accepted Answer

Jellyfish

Chapter 32: Metazoan Animal Diversity

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