Question 1

A leech

Accepted Answer

A)  has a clitellum only during the breeding season. 
B)  has a fixed number of segments. 
C)  has both anterior and posterior suckers. 
D)  has a coelomic cavity filled with connective tissue. 
E)  All of the choices are correct. 
A)  has a clitellum only during the breeding season. 
B)  has a fixed number of segments. 
C)  has both anterior and posterior suckers. 
D)  has a coelomic cavity filled with connective tissue. 
E)  All of the choices are correct.

Question 2

Of what evolutionary significance is the "hydrostatic skeleton"?

Accepted Answer

The hydrostatic skeleton is of significa

Question 3

Why do zoologists not have a well-accepted theory for the origin of segmentation?

Accepted Answer

The origin of segmentation in animals is

Question 4

When earthworms copulate,each stores the other's sperm in chambers called a/an

Accepted Answer

A)  clitellum. 
B)  egg capsule. 
C)  nephridiopore. 
D)  seminal receptacle. 
E)  seminal vesicle. 
A)  clitellum. 
B)  egg capsule. 
C)  nephridiopore. 
D)  seminal receptacle. 
E)  seminal vesicle.

Question 5

The cocoon in the earthworm is produced by the

Accepted Answer

A)  Clitellum 
B)  Prostomium 
C)  Calciferous glands 
D)  Chloragogen cells 
E)  Typhlosole 
A)  Clitellum 
B)  Prostomium 
C)  Calciferous glands 
D)  Chloragogen cells 
E)  Typhlosole

Question 6

You experiment with a live earthworm and notice the following results: - With an intact earthworm,when you "poke" a segment,it contracts.
- When you cut off the first segments containing the brain,the remaining worm still crawls.
- When you cut the nerve in each septal wall,contractions continue.
- If you cut the body wall,leaving the nerve cord intact,crawling still continues.
- When you cut both the body wall nerve and the nerve cord,there are no longer any coordinated contractions.
What is a reasonable conclusion?

Accepted Answer

A)  An earthworm's brain controls crawling. 
B)  The ventral nerve cord controls all contractions. 
C)  Mechanical stimulation of each segment triggers contractions. 
D)  Earthworms use ventral nerve cord to coordinate contractions along the length of the worm and mechanical stimulation of each segment to triggers segmental responses during crawling. 
E)  None of the choices are correct. 
A)  An earthworm's brain controls crawling. 
B)  The ventral nerve cord controls all contractions. 
C)  Mechanical stimulation of each segment triggers contractions. 
D)  Earthworms use ventral nerve cord to coordinate contractions along the length of the worm and mechanical stimulation of each segment to triggers segmental responses during crawling. 
E)  None of the choices are correct.

Question 7

Darwin observed earthworm behavior where a worm would seize a leaf fragment by its narrow end in order to pull the leaf into its burrow.This behavior is

Accepted Answer

A)  Evidence of high level reasoning 
B)  Mainly a product of trial and error 
C)  Genetic or innate 
D)  Proof of an extensive ability to learn 
E)  Now known to be totally random 
A)  Evidence of high level reasoning 
B)  Mainly a product of trial and error 
C)  Genetic or innate 
D)  Proof of an extensive ability to learn 
E)  Now known to be totally random

Question 8

Earthworms are parthenogenetic.Is this an evolutionary relic where they have been unable to evolve separate sexes,or is this an advantage for an organism with their life style? Explain your answer.

Accepted Answer

Earthworms being parthenogenetic, meanin

Question 9

Leeches

Accepted Answer

A)  are mostly found in fresh water. 
B)  are largely "micropredators" but sometimes parasites. 
C)  may be carnivores on small invertebrates. 
D)  are more abundant in the tropics. 
E)  All of the choices are correct. 
A)  are mostly found in fresh water. 
B)  are largely "micropredators" but sometimes parasites. 
C)  may be carnivores on small invertebrates. 
D)  are more abundant in the tropics. 
E)  All of the choices are correct.

Question 10

In the earthworm,the typhlosole

Accepted Answer

A)  is the organ of locomotion. 
B)  increases the absorptive area of the gut. 
C)  grinds the food. 
D)  produces secretions during mating. 
E)  coordinates the contractions of the digestive system. 
A)  is the organ of locomotion. 
B)  increases the absorptive area of the gut. 
C)  grinds the food. 
D)  produces secretions during mating. 
E)  coordinates the contractions of the digestive system.

Question 11

Reproduction in the earthworm involves

Accepted Answer

A)  Asexual budding 
B)  Self-fertilization 
C)  Cross-fertilization between two dioecious organisms 
D)  Cross-fertilization between two hermaphroditic organisms 
E)  Reproduction by "stem mothers." 
A)  Asexual budding 
B)  Self-fertilization 
C)  Cross-fertilization between two dioecious organisms 
D)  Cross-fertilization between two hermaphroditic organisms 
E)  Reproduction by "stem mothers."

Question 12

Many polychaetes are euryhaline meaning that they

Accepted Answer

A)  can tolerate a wide range of salinity. 
B)  must live in marine conditions. 
C)  possess both male and female reproductive organs. 
D)  always live in tubes. 
E)  lack any circulatory system. 
A)  can tolerate a wide range of salinity. 
B)  must live in marine conditions. 
C)  possess both male and female reproductive organs. 
D)  always live in tubes. 
E)  lack any circulatory system.

Question 13

In leeches,a cocoon into which fertilized eggs will be deposited is secreted by the __________.

Accepted Answer

The answer of In leeches,a cocoon into which fertilized eggs...

Question 14

The circulatory system of earthworms is

Accepted Answer

A)  closed with hearts pumping blood to the anterior arteries and veins returning from the posterior. 
B)  open with blood "washing" through the coelomic cavity. 
C)  half closed with hearts pushing blood toward the head but washing posteriorly through an open cavity. 
D)  closed with dorsal and ventral blood vessels joined by five paired "hearts" forcing circulation flow dorsal-ventrally. 
E)  absent and they rely solely on diffusion to absorb gases through the epidermis. 
A)  closed with hearts pumping blood to the anterior arteries and veins returning from the posterior. 
B)  open with blood "washing" through the coelomic cavity. 
C)  half closed with hearts pushing blood toward the head but washing posteriorly through an open cavity. 
D)  closed with dorsal and ventral blood vessels joined by five paired "hearts" forcing circulation flow dorsal-ventrally. 
E)  absent and they rely solely on diffusion to absorb gases through the epidermis.

Question 15

The polychaetes

Accepted Answer

A)  belong to the smallest and most evolutionarily derived class of annelids. 
B)  are mostly freshwater inhabitants. 
C)  are mostly terrestrial, living in moist soil. 
D)  consist of active predators and sedentary particle feeders. 
E)  cannot tolerate brackish or marine salinity. 
A)  belong to the smallest and most evolutionarily derived class of annelids. 
B)  are mostly freshwater inhabitants. 
C)  are mostly terrestrial, living in moist soil. 
D)  consist of active predators and sedentary particle feeders. 
E)  cannot tolerate brackish or marine salinity.

Question 16

Compared to earthworms,freshwater oligochaetes

Accepted Answer

A)  have more conspicuous setae. 
B)  have better-developed sense organs. 
C)  are more mobile. 
D)  All of the choices are correct. 
E)  None of the choices are correct. 
A)  have more conspicuous setae. 
B)  have better-developed sense organs. 
C)  are more mobile. 
D)  All of the choices are correct. 
E)  None of the choices are correct.

Question 17

Why does the wound from the bite of a leech bleed profusely?

Accepted Answer

The wound from the bite of a leech bleed

Question 18

In contrast to roundworms,how do segmented worms elongate or stretch lengthwise?

Accepted Answer

A)  Contracting the longitudinal muscles 
B)  Contracting circular muscles 
C)  Forcibly expanding the circular muscles 
D)  Forcibly expanding longitudinal muscles 
E)  Snapping back to original shape of the hard cuticle 
A)  Contracting the longitudinal muscles 
B)  Contracting circular muscles 
C)  Forcibly expanding the circular muscles 
D)  Forcibly expanding longitudinal muscles 
E)  Snapping back to original shape of the hard cuticle

Question 19

Giant axons are utilized in the earthworm for

Accepted Answer

A)  coordinating mating. 
B)  rapid escape movements. 
C)  preventing drowning. 
D)  coordinating digestion. 
E)  improving the visual sensory system. 
A)  coordinating mating. 
B)  rapid escape movements. 
C)  preventing drowning. 
D)  coordinating digestion. 
E)  improving the visual sensory system.

Question 20

Older taxonomic treatments represent the Annelida as consisting of three classes: Polychaeta,Oligochaeta,and Hirudinea. Compare and contrast that representation to what we know about phylogenetic relationships within the phylum today.

Accepted Answer

Older taxonomic treatments of the phylum

Exam 17: Annelids and Allied Taxa

A leech

Of what evolutionary significance is the "hydrostatic skeleton"?

Why do zoologists not have a well-accepted theory for the origin of segmentation?

When earthworms copulate,each stores the other's sperm in chambers called a/an

The cocoon in the earthworm is produced by the

Darwin observed earthworm behavior where a worm would seize a leaf fragment by its narrow end in order to pull the leaf into its burrow.This behavior is

Earthworms are parthenogenetic.Is this an evolutionary relic where they have been unable to evolve separate sexes,or is this an advantage for an organism with their life style? Explain your answer.

Leeches

In the earthworm,the typhlosole

Reproduction in the earthworm involves

Many polychaetes are euryhaline meaning that they

In leeches,a cocoon into which fertilized eggs will be deposited is secreted by the __________.

The circulatory system of earthworms is

The polychaetes

Compared to earthworms,freshwater oligochaetes

Why does the wound from the bite of a leech bleed profusely?

In contrast to roundworms,how do segmented worms elongate or stretch lengthwise?

Giant axons are utilized in the earthworm for

Older taxonomic treatments represent the Annelida as consisting of three classes: Polychaeta,Oligochaeta,and Hirudinea. Compare and contrast that representation to what we know about phylogenetic relationships within the phylum today.

Life: Biological Principles and the Science of Zoology

The Origin and Chemistry of Life

Cells As Units of Life

Cellular Metabolism

Genetics: a Review

Organic Evolution

The Reproductive Process

Principles of Development

Architectural Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

Radiate Animals

Acoelomorpha,Platyzoa,and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

Support, Protection, and Movement

Chaetognaths, Echinoderms, and Hemichordates

Chordates

Fishes

Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Support, protection, and Movement

Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

Homeostasis: Internal Fluids and Respiration

Digestion and Nutrition

Nervous Coordination: Nervous System and Sense Organs

Chemical Coordination: Endocrine System

Immunity

Animal Behavior

Animal Distributions

Animal Ecology

Filters