Question 1

Which of the following statements best describes the evolutionary relationship between Porifera, Cnidaria, and Bilateria as shown in the animal phylogeny?

Accepted Answer

Cnidaria and Bilateria share a more recent common ancestor with each other than with Porifera.

Question 2

Which of the following is a key difference between a gastrovascular cavity and an alimentary canal?

Accepted Answer

An alimentary canal allows for specialization of digestive regions, while a gastrovascular cavity does not.

Question 3

During swallowing, what is the primary function of the epiglottis?

Accepted Answer

To prevent food from entering the trachea by covering the glottis.

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 throughout the entire systemic circuit, requiring greater pressure.

Question 5

Which of the following animals has a closed circulatory system and double circulation?

Accepted Answer

Mammal

Question 6

What is the main function of the nephron in the human excretory system?

Accepted Answer

To filter blood, recover water and nutrients, and remove nitrogenous waste.

Question 7

Which of the following is a characteristic unique to animals in the phylum Porifera?

Accepted Answer

Presence of choanocytes for filter feeding.

Question 8

Cnidarians are unique among eumetazoans because they:

Accepted Answer

Are diploblastic and possess specialized stinging cells called cnidocytes.

Question 9

Which of the following best describes the respiratory adaptation found in insects?

Accepted Answer

A tracheal system with air sacs and tracheoles for direct gas exchange.

Question 10

Which structure in the human digestive system is primarily responsible for nutrient absorption?

Accepted Answer

Small intestine

Question 11

A student observes an animal with a muscular foot, a mantle, and a visceral mass. To which phylum does this animal most likely belong?

Accepted Answer

Mollusca

Question 12

Which of the following is true regarding protostome and deuterostome development?

Accepted Answer

In deuterostomes, the blastopore becomes the anus.

Question 13

Which of the following is a function of the squid's ink sac?

Accepted Answer

To release ink that confuses predators.

Question 14

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

Accepted Answer

Porifera

Question 15

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

Accepted Answer

To provide more time and space for the digestion of tough plant material.

Question 16

Which of the following is a correct pathway for a drop of blood starting in the right ventricle of the human heart?

Accepted Answer

Right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium

Question 17

Which of the following is a function of the choanocyte in sponges?

Accepted Answer

Creating water currents and capturing food particles.

Question 18

Which of the following best describes the difference between radial and bilateral symmetry?

Accepted Answer

Bilateral symmetry allows for cephalization and directional movement, while radial symmetry is suited for sessile or drifting lifestyles.

Question 19

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

Accepted Answer

Motile, bell-shaped body with tentacles hanging downward.

Question 20

Which of the following is a correct pairing of animal group and excretory system adaptation?

Accepted Answer

Insects – Malpighian tubules

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

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