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 primarily 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 statements about the body symmetry of the major animal phyla is correct?

Accepted Answer

Cnidarians have radial symmetry, while annelids have bilateral symmetry.

Question 5

A scientist discovers a new marine animal with a segmented body, a closed circulatory system, and bristles on each segment but no appendages. To which group does this animal most likely belong?

Accepted Answer

Oligochaetes

Question 6

Which of the following is a key difference between the digestive systems of cnidarians and annelids?

Accepted Answer

Annelids have a complete digestive tract, while cnidarians have a gastrovascular cavity with one opening.

Question 7

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 8

Which structure is unique to molluscs and is used for feeding by scraping food from surfaces?

Accepted Answer

Radula

Question 9

A patient presents with anemia after swimming in a freshwater lake. Examination reveals a segmented worm attached externally, feeding on blood. Which animal is most likely responsible?

Accepted Answer

Leech

Question 10

Which of the following equations correctly 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 11

Which of the following is a defining feature of the phylum Annelida?

Accepted Answer

Segmented body with a coelom in each segment

Question 12

Which of the following best describes the evolutionary significance of the development of a coelom in annelids?

Accepted Answer

It provides a hydrostatic skeleton for movement and space for organ development.

Question 13

Which of the following animals is most likely to be found as a colonial organism composed entirely of polyps?

Accepted Answer

Staghorn coral

Question 14

Which of the following is true regarding the nervous system of cnidarians?

Accepted Answer

They possess a neural net without a brain or head.

Question 15

Which of the following best explains why bivalves are considered mostly sedentary compared to cephalopods?

Accepted Answer

Bivalves have two shells and are filter feeders, while cephalopods are active predators with tentacles.

Question 16

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

Accepted Answer

Molluscs – mantle that secretes shell

Question 17

A marine biologist finds an animal with a soft body, a shell, a muscular foot, and a radula. Which class of molluscs does this animal most likely belong to?

Accepted Answer

Gastropoda

Question 18

Which of the following best describes the main function of the gastrovascular cavity in cnidarians?

Accepted Answer

It functions in both digestion and distribution of nutrients.

Question 19

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

Accepted Answer

Decline in reef biodiversity and fish populations

Animal Diversity I: Major Invertebrate Phyla

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