Question 1

Which of the following statements best describes a coelomate animal?

Accepted Answer

It has a body cavity completely lined by tissue derived from mesoderm.

Question 2

Which phylum contains animals that are pseudocoelomates?

Accepted Answer

Nematoda

Question 3

A student observes a worm with a segmented body, a true coelom, and a closed circulatory system. To which phylum does this worm most likely belong?

Accepted Answer

Annelida

Question 4

Which of the following is a major evolutionary advantage of having a coelom?

Accepted Answer

It allows for the development of a hydrostatic skeleton, facilitating more complex movement.

Question 5

Which of the following best describes the body cavity of a nematode?

Accepted Answer

Pseudocoelomate, with a cavity partially lined by mesoderm

Question 6

Which structure in parasitic platyhelminthes provides both protection from the host's immune system and absorption of nutrients?

Accepted Answer

Tegument

Question 7

A tapeworm is found in the intestine of a dog. Which anatomical feature allows it to attach to the host's intestinal wall?

Accepted Answer

Scolex

Question 8

Which of the following equations best represents the relationship between hydrostatic pressure ($$P$$), force ($$F$$), and area ($$A) in $$the hydrostatic skeleton of a nematode?

Accepted Answer

$$P = \frac{F}{A}$$

Question 9

Which of the following is NOT a function of the coelom in annelids?

Accepted Answer

Preventing the transport of nutrients and gases

Question 10

A patient is diagnosed with elephantiasis. Which parasite and vector are most likely responsible for this condition?

Accepted Answer

Wuchereria bancrofti and mosquito

Question 11

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

Accepted Answer

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

Question 12

Which life cycle stage of Fasciola hepatica is responsible for infecting vertebrate hosts?

Accepted Answer

Metacercariae

Question 13

Which of the following is a defining feature of metameric segmentation in annelids?

Accepted Answer

Repetition of external and internal body parts along the longitudinal axis

Question 14

Which of the following is a medically important nematode that infects humans and is transmitted via contaminated food?

Accepted Answer

Ascaris lumbricoides

Question 15

Which of the following best describes the nervous system of an earthworm?

Accepted Answer

A dorsal brain and paired ventral nerve cord with ganglia in each segment

Question 16

Which of the following is a real-world consequence of nematode infection in agriculture?

Accepted Answer

Reduced crop yields due to root damage

Question 17

Which of the following statements about the clitellum in annelids is correct?

Accepted Answer

It secretes mucus for copulation and forms a cocoon for eggs.

Question 18

Which subclass of annelids is characterized by many setae and a well-developed head, and is mostly marine?

Accepted Answer

Errantia (Polychaeta)

Question 19

A scientist discovers a worm with no body cavity, a simple digestive system, and a tegument. Which phylum does this organism most likely belong to?

Accepted Answer

Platyhelminthes

Question 20

Which of the following is a correct sequence of tissue layers from outside to inside in a coelomate animal?

Accepted Answer

Body covering (ectoderm) → tissue lining coelom (mesoderm) → digestive tract (endoderm)

Worms and Body Cavities: Flatworms, Roundworms, and Segmented Worms

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