Question 1

Which of the following characteristics is unique to animals and distinguishes them from fungi and plants?

Accepted Answer

They lack cell walls and use ingestion to obtain nutrients.

Question 2

During animal development, the blastula folds inward to form a structure with three embryonic layers. Which layer gives rise to the nervous system?

Accepted Answer

Ectoderm

Question 3

Which of the following best describes the Cambrian explosion?

Accepted Answer

A rapid diversification of animal body plans between 535 and 525 million years ago.

Question 4

Which animal group is characterized by the absence of true tissues?

Accepted Answer

Sponges

Question 5

A scientist discovers a new animal with bilateral symmetry, three tissue layers, and a pseudocoelom. Which phylum does this animal most likely belong to?

Accepted Answer

Nematoda

Question 6

Which of the following is a function of the body cavity (coelom) in animals?

Accepted Answer

It cushions internal organs and allows them to move independently of the body wall.

Question 7

In protostomes, the opening formed during gastrulation becomes the:

Accepted Answer

Mouth

Question 8

Which of the following is NOT a feature of arthropods?

Accepted Answer

A closed circulatory system

Question 9

Which animal group is defined by having a dorsal, hollow nerve cord, a notochord, pharyngeal slits, and a post-anal tail?

Accepted Answer

Chordates

Question 10

A patient is diagnosed with a parasitic infection caused by a tapeworm. Which of the following features would you expect to find in this parasite?

Accepted Answer

A ribbonlike body with repeated units and an anterior scolex armed with hooks and suckers

Question 11

Which of the following best describes the feeding strategy of sponges?

Accepted Answer

They filter food particles from water using choanocytes.

Question 12

Which of the following is a unique feature of echinoderms?

Accepted Answer

A water vascular system for movement

Question 13

Which of the following is true about insect metamorphosis?

Accepted Answer

More than 80% of insect species undergo complete metamorphosis, which includes a larval, pupal, and adult stage.

Question 14

Which of the following is a function of the radula in molluscs?

Accepted Answer

Scraping food from surfaces

Question 15

Which of the following statements about annelids is correct?

Accepted Answer

They have a closed circulatory system.

Question 16

A marine biologist finds an animal with radial symmetry, two tissue layers, and stinging cells. This animal is most likely a:

Accepted Answer

Cnidarian

Question 17

Which of the following is a real-world example of the importance of earthworms in agriculture?

Accepted Answer

They aerate soil and improve its texture by ingesting soil and extracting nutrients.

Question 18

Which of the following is a defining feature of bivalves?

Accepted Answer

Shells divided into two halves that are hinged together

Question 19

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

Accepted Answer

Producing skeletal fibers composed of protein and spicules

Question 20

Which of the following is true about the evolutionary relationship between echinoderms and chordates?

Accepted Answer

Both are deuterostomes.

Animal Evolution and Diversity: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards