Question 1

Which of the following evolutionary innovations first appeared during the Cambrian explosion and contributed to the diversification of animal body plans?

Accepted Answer

Emergence of bilateral symmetry and three tissue layers

Question 2

Which of the following is a defining characteristic of amniotes that distinguishes them from amphibians?

Accepted Answer

Production of an amniotic egg with specialized membranes

Question 3

A researcher discovers a new animal species with a segmented body, jointed appendages, and a hard exoskeleton. To which group does this animal most likely belong?

Accepted Answer

Arthropods

Question 4

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

Accepted Answer

In open systems, the circulatory fluid bathes organs directly; in closed systems, blood is confined to vessels.

Question 5

Which of the following is an example of negative feedback in human physiology?

Accepted Answer

Secretion of insulin to lower blood glucose after a meal

Question 6

Which of the following best explains why countercurrent exchange in fish gills is more efficient than concurrent flow?

Accepted Answer

It maintains a constant gradient for oxygen diffusion across the entire gill surface.

Question 7

Which of the following is NOT a function of the mammalian kidney?

Accepted Answer

Production of insulin

Question 8

Which of the following best describes the role of the effector in a homeostatic feedback loop?

Accepted Answer

Carries out a response to return the variable to the set point

Question 9

Which of the following animals is an osmoconformer?

Accepted Answer

Marine invertebrate such as a sea star

Question 10

Which of the following is a correct sequence of the four steps of food processing in animals?

Accepted Answer

Ingestion → Digestion → Absorption → Elimination

Question 11

Which of the following is a water-soluble hormone?

Accepted Answer

Insulin

Question 12

Which of the following adaptations is found in ruminants but not in carnivores?

Accepted Answer

Multiple stomach compartments for fermenting plant material

Question 13

Which of the following best describes the function of capillaries in the circulatory system?

Accepted Answer

Allow exchange of gases, nutrients, and wastes between blood and tissues

Question 14

Which of the following is a correct statement about the direction of blood flow in the mammalian heart?

Accepted Answer

Blood enters the left atrium from the pulmonary veins

Question 15

Which of the following is an example of a positive feedback mechanism?

Accepted Answer

Release of oxytocin to intensify uterine contractions during childbirth

Question 16

Which of the following best describes the main difference between regulators and conformers?

Accepted Answer

Regulators maintain internal stability despite external changes; conformers allow internal conditions to change with the environment.

Question 17

Which of the following is a correct pairing of animal group and circulatory system type?

Accepted Answer

Earthworms – closed circulatory system

Question 18

Which of the following best describes the process of osmoregulation?

Accepted Answer

Regulation of solute concentrations and water balance

Question 19

Which of the following is a correct description of the cardiac cycle?

Accepted Answer

The alternating contractions and relaxations of the heart

Question 20

Which of the following is a major function of the lymphatic system?

Accepted Answer

Returning fluid, proteins, and cells to the blood

Animal Evolution, Physiology, Nutrition, and Circulation: Study Guide for BIOL 191A

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