Question 1

Which of the following statements best explains why flatworms (Platyhelminthes) are dorsoventrally flattened?

Accepted Answer

Flattening increases surface area, allowing for more efficient gas exchange and elimination of nitrogenous waste by diffusion.

Question 2

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

Accepted Answer

Arthropoda

Question 3

Which of the following is a unique feature of cnidarians that distinguishes them from other animal phyla?

Accepted Answer

Cnidocytes containing nematocysts for prey capture and defense

Question 4

Which of the following best describes the feeding mechanism of sponges (Porifera)?

Accepted Answer

They filter particles from water using choanocytes and engulf food by phagocytosis.

Question 5

Which of the following is a correct pairing of animal group and its main characteristic?

Accepted Answer

Tardigrada – can survive extreme desiccation and temperatures in a dormant state

Question 6

A patient is diagnosed with trichinosis after eating undercooked pork. Which phylum does the causative parasite belong to?

Accepted Answer

Nematoda

Question 7

Which of the following adaptations allowed arthropods to successfully colonize terrestrial environments?

Accepted Answer

Development of a rigid exoskeleton that reduces water loss and provides structural support

Question 8

Which of the following is true about the life cycle of most hydrozoans?

Accepted Answer

They alternate between polyp and medusa forms.

Question 9

Which structure is used by bivalve molluscs for both feeding and gas exchange?

Accepted Answer

Gills

Question 10

Which of the following best explains why coral reefs are threatened by ocean acidification?

Accepted Answer

Acidification reduces the availability of calcium carbonate, making it harder for corals to build their exoskeletons.

Question 11

Which of the following is a defining characteristic of deuterostomes?

Accepted Answer

The blastopore develops into the anus during embryonic development.

Question 12

Which of the following is NOT a function of the amoebocytes in sponges?

Accepted Answer

Capturing prey using nematocysts

Question 13

Which of the following best describes the difference between a medusa and a polyp in cnidarians?

Accepted Answer

A medusa is free-swimming and bell-shaped, while a polyp is sessile and cylindrical.

Question 14

Which of the following is a correct statement about the water vascular system in echinoderms?

Accepted Answer

It is a network of hydraulic canals that functions in locomotion and feeding.

Question 15

Which of the following is a real-world consequence of insect resistance to pesticides?

Accepted Answer

Crop losses increase as insects evolve resistance, leading to greater food insecurity.

Question 16

Which of the following is a feature shared by both ectoprocts and brachiopods?

Accepted Answer

A lophophore, a crown of ciliated tentacles used for feeding

Question 17

A scientist finds an animal with a U-shaped alimentary canal, no distinct head, and a crown of ciliated tentacles. Which group does it most likely belong to?

Accepted Answer

Ectoprocta

Question 18

Which of the following is a correct statement about the nervous system of planarians?

Accepted Answer

It is more centralized and complex than that of cnidarians, with eyespots and ganglia.

Question 19

Which of the following is a plausible explanation for why molluscs have the highest number of documented extinctions among animals?

Accepted Answer

Freshwater and terrestrial molluscs are highly sensitive to habitat loss, pollution, and invasive species.

An Introduction to Invertebrates: Diversity, Structure, and Function

Study Guide - Practice Questions

Study Guide - Flashcards