Question 1

Which of the following is NOT a key trait shared by all animals?

Accepted Answer

Ability to photosynthesize using chloroplasts

Question 2

Which group is considered the closest living relative to animals, based on both morphological and genetic evidence?

Accepted Answer

Choanoflagellates

Question 3

Which of the following statements about the Cambrian explosion is correct?

Accepted Answer

Most animal phyla originated suddenly during the Cambrian period.

Question 4

Which of the following is a function of the coelom in animals?

Accepted Answer

It enables internal organs to move independently of the body wall.

Question 5

A researcher discovers a new animal species with three embryonic tissue layers and a body cavity only partially lined with mesoderm. How should this animal be classified?

Accepted Answer

Pseudocoelomate

Question 6

Which gene family is primarily responsible for regulating the development of the anterior–posterior axis in bilaterians?

Accepted Answer

Hox genes

Question 7

Which of the following is an example of convergent evolution in animal sensory systems?

Accepted Answer

The independent evolution of bilateral symmetry in echinoderms and bilaterians

Question 8

Which of the following feeding strategies is correctly matched with an example organism?

Accepted Answer

Fluid feeder – butterfly

Question 9

Which of the following best explains why sexual reproduction is favored in variable or unfavorable environments?

Accepted Answer

It leads to greater genetic diversity.

Question 10

A scientist observes an animal that lays eggs, and the embryos are nourished by yolk within the egg. Which reproductive strategy does this animal use?

Accepted Answer

Oviparous

Question 11

Which of the following is a key advantage of segmentation in animals?

Accepted Answer

It allows for the evolution of specialized body regions.

Question 12

Which of the following is NOT a function of animal locomotion?

Accepted Answer

Photosynthesis

Question 13

Which type of skeleton is found in arthropods and provides support from rigid structures on the outside of the body?

Accepted Answer

Exoskeleton

Question 14

Which of the following is a correct pairing of animal group and embryonic tissue layers?

Accepted Answer

Ctenophores – diploblastic

Question 15

Which of the following is a plausible explanation for why metamorphosis is favored by natural selection in some animal groups?

Accepted Answer

It enables dispersal to new habitats and reduces competition between life stages.

Question 16

Which of the following is true about the evolution of animal appendages?

Accepted Answer

The Distal-less (Dll) gene is involved in limb formation across multiple animal phyla.

Question 17

Which of the following is an example of an animal with a hydrostatic skeleton?

Accepted Answer

Earthworm

Question 18

Which of the following is a correct description of a parasite?

Accepted Answer

An organism that harvests nutrients from parts of its host, usually without killing it

Question 19

Which of the following is a real-world example of a suspension feeder?

Accepted Answer

Barnacle

Question 20

Which of the following best describes the evolutionary significance of the animal genetic tool kit?

Accepted Answer

It enabled the evolution of new body plans and increased animal diversification.

Chapter 30: An Introduction to Animals – Structure, Diversity, and Evolution

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