Question 1

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

Accepted Answer

They filter food particles from water using choanocytes, which create a current with their flagella.

Question 2

Which cell type in sponges is responsible for distributing nutrients throughout the organism?

Accepted Answer

Amoebocytes

Question 3

Cnidarians possess a unique cell type used for defense and prey capture. What is this cell called, and what is its function?

Accepted Answer

Cnidocyte; discharges a stinging thread to immobilize prey

Question 4

Which of the following is a key difference between flatworms (Platyhelminthes) and annelids?

Accepted Answer

Annelids have a segmented body with a coelom, while flatworms lack segmentation and a coelom.

Question 5

Which of the following best explains why tapeworms lack a digestive system?

Accepted Answer

They absorb pre-digested nutrients directly from their host's intestine.

Question 6

A marine biologist discovers a worm with parapodia and many bristles on each segment. To which group does this organism most likely belong?

Accepted Answer

Polychaetes

Question 7

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

Accepted Answer

A body plan with a visceral mass, mantle, and muscular foot

Question 8

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

Accepted Answer

$$A = 4\pi r^2$, V$$ = \frac{4}{3}\pi $$r^3$$; flatworms maximize surface area for diffusion due to lack of circulatory system.

Question 9

Which of the following best describes the nervous system of cnidarians?

Accepted Answer

A neural net without a brain or head

Question 10

Which of the following is true about the digestive system of annelids?

Accepted Answer

They have a complete digestive system with separate mouth and anus.

Question 11

A patient is diagnosed with a liver fluke infection. Which of the following statements about the organism is correct?

Accepted Answer

It is a parasitic flatworm with a complex life cycle involving multiple hosts.

Question 12

Which of the following best explains why earthworms are important for soil health?

Accepted Answer

They aerate the soil and decompose organic matter, enhancing nutrient cycling.

Question 13

Which of the following is a defining feature of bivalve molluscs?

Accepted Answer

Two shells (valves) joined together, usually sedentary lifestyle

Question 14

Which of the following best describes the evolutionary relationship between sponges and other animal phyla?

Accepted Answer

Sponges are basal animals that lack true tissues, diverging before the evolution of tissues in other animals.

Question 15

Which of the following is a correct pairing of animal group and a unique feature?

Accepted Answer

Annelids – closed circulatory system

Question 16

Which of the following best explains why cephalopods (e.g., octopus) are considered advanced among molluscs?

Accepted Answer

They have a highly developed nervous system and complex eyes, allowing for advanced behaviors.

Question 17

Which of the following is a real-world consequence of coral bleaching, which affects colonial cnidarians?

Accepted Answer

Loss of habitat for many marine species, leading to decreased biodiversity

Question 18

Which of the following best describes the function of the mantle in molluscs?

Accepted Answer

It secretes the shell and forms a cavity for respiration and excretion.

Question 19

Which of the following is a correct statement about the symmetry of animal phyla?

Accepted Answer

Sponges lack symmetry, cnidarians have radial symmetry, and flatworms have bilateral symmetry.

Question 20

Which of the following best explains why leeches are used in modern medicine?

Accepted Answer

They secrete anticoagulants that prevent blood clotting, useful in microsurgery.

Animal Diversity I: Major Invertebrate Phyla

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