Question 1

Which of the following statements best describes the main difference between a gastrovascular cavity and an alimentary canal?

Accepted Answer

A gastrovascular cavity has a single opening that functions as both mouth and anus, while an alimentary canal has two separate openings for ingestion and elimination.

Question 2

Which phylum is characterized by the absence of true tissues and irregular symmetry?

Accepted Answer

Porifera

Question 3

During swallowing, what is the function of the epiglottis?

Accepted Answer

It covers the opening to the respiratory tract, preventing food from entering the lungs.

Question 4

Which of the following best explains why the left side of the human heart is more muscular than the right side?

Accepted Answer

It pumps blood to the entire body through the systemic circuit, requiring greater pressure.

Question 5

Which of the following animals has a closed circulatory system?

Accepted Answer

Earthworm

Question 6

In which group does the blastopore become the mouth during embryonic development?

Accepted Answer

Protostomes

Question 7

Which of the following is a function of the nephron in the human kidney?

Accepted Answer

Filtering waste from the blood and recovering water, nutrients, and electrolytes

Question 8

Which of the following best describes the respiratory system of insects?

Accepted Answer

They use a system of tracheae and air sacs to deliver oxygen directly to tissues.

Question 9

Which of the following is a characteristic of animals in the phylum Cnidaria?

Accepted Answer

They have radial symmetry and two tissue layers.

Question 10

What is the main function of choanocytes in sponges?

Accepted Answer

They create water currents and capture food particles by phagocytosis.

Question 11

Which of the following best describes the difference between open and closed circulatory systems?

Accepted Answer

Open systems allow hemolymph to flow freely among tissues, while closed systems keep blood within vessels.

Question 12

Which of the following animals has a single circulatory circuit and a two-chambered heart?

Accepted Answer

Fish

Question 13

Which structure in the human respiratory system is the primary site of gas exchange?

Accepted Answer

Alveoli

Question 14

Which of the following is true about the digestive system of a squid?

Accepted Answer

It is complete, with separate mouth and anus.

Question 15

Which of the following best describes the function of the diaphragm in human respiration?

Accepted Answer

It contracts and moves downward to expand the lungs and draw air in.

Question 16

Which of the following is a correct pairing of animal group and body symmetry?

Accepted Answer

Cnidaria – radial symmetry

Question 17

Which of the following is a function of the liver in the human digestive system?

Accepted Answer

Producing bile to aid in fat digestion

Question 18

Which of the following best explains why herbivores often have a longer cecum than carnivores?

Accepted Answer

A longer cecum increases the time available for digesting tough plant material.

Question 19

Which of the following is a distinguishing feature of the medusa form in cnidarians?

Accepted Answer

It is motile and has a bell-shaped body with tentacles hanging downward.

Question 20

Which of the following best describes the function of spicules in sponges?

Accepted Answer

They provide structural support and defense.

Body Systems and Animal Diversity: Porifera, Cnidaria, and Lophotrochozoans

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