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AP Biology
Biology, Campbell and Reece, 7th Edition
Adapted from chapter reading guides originally created by Lynn Miriello
Unit 10: Animals
Guided Reading Questions (100 pts total)
Chapter 32 – An Introduction to Animal Diversity
1. Define the following terms:
a. Cleavage –
b. Blastula –
c. Gastrula –
d. Larva –
e. Metamorphosis –
2. Label the diagram below of early embryonic development.
3. What is believed to be the common ancestor of living animals?
4. What are two hypotheses for the Cambrian Explosion?
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5. Define the following terms with regard to animal body plans.
a. Grade –
b. Body plan –
c. Radial symmetry –
d. Bilateral symmetry –
e. Dorsal –
f. Ventral –
g. Anterior –
h. Posterior –
i. Cephalization –
j. Germ layers –
k. Endoderm –
l. Ectoderm –
m. Archenteron –
n. Diploblastic –
o. Triploblastic –
p. Mesoderm –
q. Body cavity –
r. Coelom –
s. Pseudocoelomate –
t. Coelomate –
u. Acoelomate –
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6. Color and label the following diagram.
7. Color and label the diagram below to compare
and contrast the development of protostomes
and deuterostomes.
8. What is the difference between determinate cleavage, radial cleavage and indeterminate cleavage?
9. What are the 5 points of agreement on animal phylogeny?
1.
2.
3.
4.
5.
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AP Biology Exam Checkpoint:
_____ 10. Study the two phylogenic trees above (Figures 32.10 & 32.11). What is their basic disagreement?
A. The tree on the left includes ctenophores and cnidarians in the same clade, while the tree on the
right separates them into different clades.
B. The tree on the left indicates that sponges are the oldest animal group, while the tree on the
right indicates that cnidarians are the oldest animal group.
C. The tree on the left divides the bilaterians into two clades based on modes of development,
while the tree on the right divides the bilaterians into three clades based on molecular evidence.
D. The tree on the left indicates that all animals are descended from an ancient colonial flagellate,
while the tree on the right indicates that only the eumetazoans are descended from a colonial
flagellate.
Chapter 33 - Invertebrates
1. Use the diagram below to label the anatomy of a sponge.
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2. Label the diagram below representing the life cycle of Obelia and answer the question below.
Question: What is the difference between a polyp and a medusa?
3. Label the diagram below of a planarian.
4. Describe the life cycle of the blood fluke.
5. List and describe the three main parts of a mollusk.
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Using figure 33.2 and 33.3 on pages 638-641 and the information in the text, list the relative diversity,
distinguishing characteristics and examples of each major invertebrate phylum.
Phylum
Relative Diversity
Characteristics
Examples
6. Porifera
7. Cnidaria
8. Placozoa
9. Platyhelminthes
10. Rotifera
11. Mollusca
12. Brachiopoda
13. Annelida
14. Nematoda
15. Arthropoda
16. Tardigrada
17. Hemichordata
18. Echinodermata
19. Chordata
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AP Biology Exam Checkpoint:
_____ 20. Which of the following combinations of phylum and description is incorrect?
A. Nematoda-roundworms, pseudocoelomate
B. Porifera-gastrovascular cavity, coelom present
C. Cnidaria-radial symmetry, polyp and medusa body forms
D. Platyhelminthes-flatworms, gastrovascular cavity, acoelomate
Chapter 34 - Vertebrates
1. What are the four characteristics of the Chordates?
2. Describe an example of an invertebrate chordate.
3. What characterizes the subphylum Vertebrata?
4. In the evolution of vertebrates, identify the significance of being tetrapod.
5. Identify the significance of the amniotic egg and the amniote.
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Using Table 34.2 on page 672 as well as the information in the text, outline the key characteristics that
distinguish the major branches of the Subphylum Vertebrata identified on the diagram. Include examples of
organisms in each class. Exclude the subphyla Urochordata and Cephalochordata.
Divisions of Subphylum
Vertebrata
Characteristics
Examples
6. Myxini
7. Cephalospidomorphi
8. Chondrichthyes
9. Actinopterygii
10. Actinista
11. Dipnoi
12. Amphibia
13. Reptilia
14. Mammalia
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AP Biology Exam Checkpoint:
_____ 15. According to this phylogenetic tree, the animals most closely related to mammals are _____.
A. reptiles
B. amphibians
C. ray-finned fishes
D. sharks, rays, and chimeras
Chapter 41 - Animal Nutrition
1. Define the following types of animal feeding mechanisms and give an example of an animal that uses
each mechanism:
a. Suspension –
b. Substrate –
c. Fluid –
d. Bulk –
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2. Complete the diagram below concerning animal homeostasis and blood sugar regulation.
3. How do hormones regulate appetite in humans?
4. Define the following terms:
a. Ingestion –
b. Digestion –
c. Enzymatic hydrolysis –
d. Absorption –
e. Elimination –
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5. Contrast intracellular and extracellular digestion.
6. How does the body control the absorption of nutrients in the small intestine?
7. What is the major role of the large intestine in the digestive process?
AP Biology Exam Checkpoint:
_____ 8. What is different about a ruminant’s digestive system that allows it to survive on cellulose?
A. Ruminants produce large amounts of cellulase, the enzyme required for digesting cellulose.
B. The stomachs of ruminants have unique grinding structures that function to break down plant
material.
C. Ruminants feed their microbial symbionts and then obtain nourishment from the products of that
microbial fermentation.
D. A ruminant’s intestine is much longer than most other animals, allowing more time for the digestion
and absorption of cellulose.
Chapter 42 - Circulation and Gas Exchange
1. What are the limits to diffusion as a means of transport for living organisms? Considering the rate of
diffusion, why is it essential for respiratory surfaces to maximize surface area?
2. Compare and contrast open and closed circulatory systems. Be certain focus on advantages of each.
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3. Contrast arteries, arterioles, capillaries and venules and veins.
4. Contrast the vertebrate circulatory systems of fish, amphibians, non-avian reptiles and mammals/birds.
What is the advantage of double circulation?
5. Why is gas exchange essential to all living organisms?
6. Briefly explain how the diffusion of oxygen and carbon
dioxide is dependent on the partial pressure of the gases.
Label the diagram to on the right to assist in your
explanation.
Explanation:
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AP Biology Exam Checkpoint:
_____ 7. Most of the oxygen in the blood that will be used in cellular respiration is carried from the lungs
to the body tissues ________.
A. by water
B. by the trachea
C. dissolved in blood plasma
D. combined with hemoglobin
Chapter 44 - Osmoregulation and Excretion
1. Define the following terms:
a. Osmoregulation -
b. Excretion -
c. Osmolarity -
2. Contrast how saltwater fish and freshwater fish deal with osmoregulation.
3. What is anhydrobiosis and what is special about tardigrades?
4. What are transport epitheliums?
5. What are the three forms that animals use to dispose of nitrogenous waste?
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6. Use the diagram on the right to label and define filtration, reabsorption,
secretion and excretion – be very clear on their meanings.
a. Filtration -
b. Reabsorption -
c. Secretion –
d. Excretion -
7. Use the diagram below to label the human excretory system.
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8. Study figure 44.15. Notice how the changing concentrations in osmolarity allow the human kidney to
concentrate urine. This is very important because the formation of concentrated urine helps to conserve
water. Why is this system called a countercurrent multiplier system?
9. Complete the diagram below to illustrate the hormonal control of the kidney by negative feedback
mechanisms.
AP Biology Exam Checkpoint:
_____ 10. Which of the following is the most accurate and comprehensive description of the function of
kidneys?
A. production of urine
B. filtration of the blood
C. the excretion of wastes
D. the regulation of body fluid composition
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Chapter 45 - Hormones and the Endocrine System
1. What is a hormone?
2. What constitutes the endocrine system and what are its functions? What are endocrine glands?
3. How do neurosecretory cells demonstrate the overlap between the endocrine and nervous system?
4. Label the diagram below representing the basic patterns of hormonal control.
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5. What are the three major classes of molecules that function as hormones in vertebrates?
6. Describe the mechanism of hormonal signaling for water-soluble hormones and for lipid-soluble
hormones.
7. Label the diagram below to review basics of signal transduction pathways and answer the question that
follows.
Question: How can one chemical signal molecule cause multiple effects?
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8. What is special about the structure of growth hormone? Give examples of physiological responses to
overproduction and underproduction of growth hormone.
9. What is the role of the thyroid gland and the hormones secreted by the thyroid gland?
Label the feedback loop for regulation of the thyroid.
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AP Biology Exam Checkpoint:
_____ 10. Which of the following is not an accurate statement?
A. Hormones are often regulated through feedback loops.
B. Hormones of the same chemical class always have the same function.
C. Hormones are secreted by specialized cells usually located in endocrine glands.
D. Hormones are chemical messengers that travel to target cells through the circulatory system.
Chapter 48 - Nervous Systems
1. What is a nerve net?
2. How does the organization of the nervous system of a _____ compare with the organization of the
nervous system of a ____?
a. Hydra … Insect –
b. Hydra … Flatworm –
c. Leech … Salamander –
3. What are the functions of the following?
a. Sensory Neurons –
b. Interneurons -
c. Motor Neurons -
d. Effector Cells -
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4. Label the diagram of neurons below and explain why myelin is important in nerve conduction.
Explanation:
5. Label the diagram below concerning the generation of an action potential.
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6. Label the diagram below demonstrating the conduction of the action potential.
7. Define the following terms:
a. Central Nervous System b. Peripheral Nervous System c. Somatic Nervous System d. Autonomic Nervous System Page 21 of 24
8. Contrast the core functions of the parasympathetic and sympathetic nervous system.
9. What is the limbic system and what is its function?
AP Biology Exam Checkpoint:
_____ 10. An action potential is a
A. a sudden reversal of the sodium-potassium pump.
B. a sudden increase in speed by the sodium-potassium pump.
C. a traveling wave of depolarization in the neuron membrane.
D. a brief neutralization of the charges on sodium and potassium ions.
Chapter 49 – Sensory and Motor Mechanisms
1. Describe a hydrostatic skeleton.
2. Contrast an exoskeleton and an endoskeleton. What function(s) does the skeleton fulfill for land animals?
3. Distinguish between the axial skeleton and the appendicular skeleton.
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4. Briefly describe how the muscular system interacts with the skeletal system to create movement.
5. Describe the structure of vertebrate muscle. In general, how does vertebrate muscle work?
6. Describe the sliding filament model of muscle contraction.
7. There are two basic mechanisms by which the nervous system produces graded contractions of whole
muscles. Briefly describe each mechanism.
8. Distinguish between smooth and cardiac muscle.
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9. Label the following diagram to explain muscle contraction from the nerve all the way to the roles of
actin and myosin.
AP Biology Exam Checkpoint:
_____ 10. Why is having a hydrostatic skeleton, rather than an internal skeleton, more advantageous to an
earthworm?
A. Actually, earthworms do not have a skeleton.
B. Having a hydrostatic skeleton means that having muscles is not a requirement for movement.
C. Having an internal skeleton would not allow the fine movements an earthworm uses when it
moves.
D. Having a hydrostatic skeleton allows the earthworm to use peristaltic motion to move over the
substrate.
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