Question 1

Explain the controversy over distinguishing the body symmetry of cnidarians.

Accepted Answer

The controversy over distinguishing the

Question 2

How does Hydra reproduce sexually?

Accepted Answer

A) Separate male polyps and female polyps produce sperm and eggs,respectively,that fuse and grow into a medusa 
B) The swimming medusa stages are male and female and the fertilized eggs develop into planula larvae that become Hydra polyps 
C) The polyp body wall can produce both ovaries and testes that make eggs and sperm respectively 
D) Hydra sperm fertilize an egg in the body wall and this starts the growth of a bud 
E) Hydra do not reproduce sexually since they lost the sexual medusa stage 
A) Separate male polyps and female polyps produce sperm and eggs,respectively,that fuse and grow into a medusa 
B) The swimming medusa stages are male and female and the fertilized eggs develop into planula larvae that become Hydra polyps 
C) The polyp body wall can produce both ovaries and testes that make eggs and sperm respectively 
D) Hydra sperm fertilize an egg in the body wall and this starts the growth of a bud 
E) Hydra do not reproduce sexually since they lost the sexual medusa stage

Question 3

Describe the evidence for the likely order of appearance of life-cycle stages in the evolution of Cnidarians.Evaluate the validity of conclusions that are drawn from this evidence.

Accepted Answer

The evidence for the likely order of app

Question 4

The tall secretory cells around the pedal disc and mouth of hydra are the ______ cells.

Accepted Answer

The answer of The tall secretory cells around the pedal...

Question 5

Corals important in formation of coral reefs have zoxanthellae in their tissues and are known as ________________ corals.

Accepted Answer

The answer of Corals important in formation of coral reefs...

Question 6

The function of the rhopalium is

Accepted Answer

A) digestive. 
B) respiratory. 
C) food capture. 
D) sensory. 
E) reproductive. 
A) digestive. 
B) respiratory. 
C) food capture. 
D) sensory. 
E) reproductive.

Question 7

Which of the following associations of cubozoan traits is NOT correct?

Accepted Answer

A) Velarium-where the subumbrellar edge turns inward 
B) Pedalium-a flat,tough blade at the base of each tentacle 
C) Ephyrae-a major stage of cubozoans between polyps and medusae 
D) Medusae-in cross section,almost square 
E) None of the choices is correct 
A) Velarium-where the subumbrellar edge turns inward 
B) Pedalium-a flat,tough blade at the base of each tentacle 
C) Ephyrae-a major stage of cubozoans between polyps and medusae 
D) Medusae-in cross section,almost square 
E) None of the choices is correct

Question 8

The long thread-like structures that help to overcome prey and provide defense in sea anemones are called ________ ________.

Accepted Answer

The answer of The long thread-like structures that help to...

Question 9

The class Hydrozoa contains Hydra,Obelia,and

Accepted Answer

A) the Portuguese man-of-war. 
B) aurelia. 
C) the sea anemones. 
D) most of the corals. 
E) None of the choices is correct 
A) the Portuguese man-of-war. 
B) aurelia. 
C) the sea anemones. 
D) most of the corals. 
E) None of the choices is correct

Question 10

Which association of anthozoan traits is NOT correct?

Accepted Answer

A) Hexamerous-parts in multiples of six 
B) Octomerous-parts in multiples of eight 
C) Coupled-septa matched across gastrovascular cavity 
D) Hydrostatic skeleton-hard coral secretions 
E) Pedal laceration-small pieces break off and regenerate new anemones 
A) Hexamerous-parts in multiples of six 
B) Octomerous-parts in multiples of eight 
C) Coupled-septa matched across gastrovascular cavity 
D) Hydrostatic skeleton-hard coral secretions 
E) Pedal laceration-small pieces break off and regenerate new anemones

Question 11

The fossil record of Cnidaria is

Accepted Answer

A) about the same as for other primitive animals,beginning in the Cambrian. 
B) relatively sparse since their bodies are so soft that they leave no skeleton to fossilize. 
C) one of the longest records,with fossils going back over 700 million years. 
D) sporadic since the marine environment is not a good substrate to preserve fossils. 
E) very recent since most of them have symbiotic relationships with advanced animals such as clown fish. 
A) about the same as for other primitive animals,beginning in the Cambrian. 
B) relatively sparse since their bodies are so soft that they leave no skeleton to fossilize. 
C) one of the longest records,with fossils going back over 700 million years. 
D) sporadic since the marine environment is not a good substrate to preserve fossils. 
E) very recent since most of them have symbiotic relationships with advanced animals such as clown fish.

Question 12

The polypoid stage of scyphozoans is called ________________.

Accepted Answer

The answer of The polypoid stage of scyphozoans is called...

Question 13

Which statement about Cnidaria is NOT true?

Accepted Answer

A) Reproduction is both sexual and asexual 
B) Some forms are sessile and others are motile 
C) They live in either marine or freshwater environments 
D) Tentacles are used to capture prey and put it into the mouth 
E) The body plan is tube-within-a-tube,with a distinct mouth and anus 
A) Reproduction is both sexual and asexual 
B) Some forms are sessile and others are motile 
C) They live in either marine or freshwater environments 
D) Tentacles are used to capture prey and put it into the mouth 
E) The body plan is tube-within-a-tube,with a distinct mouth and anus

Question 14

The body wall of a hydra consists of an outer epidermis and an inner gastrodermis with _______________ between them.

Accepted Answer

The answer of The body wall of a hydra consists...

Question 15

"Glue" cells in ctenophores that function in catching small animals are called ___________.

Accepted Answer

The answer of "Glue" cells in ctenophores that function in...

Question 16

A hydra moves by

Accepted Answer

A) nematocysts. 
B) expelling water from the gastrovascular cavity. 
C) contraction of the nerve net. 
D) epitheliomuscular cells in the epidermis. 
E) epitheliomuscular fibers in the mesoglea. 
A) nematocysts. 
B) expelling water from the gastrovascular cavity. 
C) contraction of the nerve net. 
D) epitheliomuscular cells in the epidermis. 
E) epitheliomuscular fibers in the mesoglea.

Question 17

Hermaphroditic sea anemones that produce sperm first and eggs later,to prevent self-fertilization,are called

Accepted Answer

A) asexual. 
B) pre-testicular. 
C) postgynous. 
D) protandrous. 
E) precocious. 
A) asexual. 
B) pre-testicular. 
C) postgynous. 
D) protandrous. 
E) precocious.

Question 18

Throughout most cnidarian groups,the basal or pedal disc serves to

Accepted Answer

A) be the base of the tentacles. 
B) attach the cnidarian to the substrate. 
C) generate buds. 
D) perform extracellular digestion. 
E) harbor sensory cells. 
A) be the base of the tentacles. 
B) attach the cnidarian to the substrate. 
C) generate buds. 
D) perform extracellular digestion. 
E) harbor sensory cells.

Question 19

The term "cnidaria" is based on the root words meaning

Accepted Answer

A) stuck in one place. 
B) middle glue. 
C) little spear. 
D) thread bladder. 
E) like nettles. 
A) stuck in one place. 
B) middle glue. 
C) little spear. 
D) thread bladder. 
E) like nettles.

Question 20

Consider that you are a biology teacher with limited budget and want to order hydra that can last across many seasons and some irregularity in food supply due to school holidays.You can order regular white hydra or green hydra.Without any further information,which do you order and why?

Accepted Answer

As a biology teacher with a limited budg

Exam 13: Cnidarians and Ctenophores

Explain the controversy over distinguishing the body symmetry of cnidarians.

How does Hydra reproduce sexually?

Describe the evidence for the likely order of appearance of life-cycle stages in the evolution of Cnidarians.Evaluate the validity of conclusions that are drawn from this evidence.

The tall secretory cells around the pedal disc and mouth of hydra are the ______ cells.

Corals important in formation of coral reefs have zoxanthellae in their tissues and are known as ________________ corals.

The function of the rhopalium is

Which of the following associations of cubozoan traits is NOT correct?

The long thread-like structures that help to overcome prey and provide defense in sea anemones are called ________ ________.

The class Hydrozoa contains Hydra,Obelia,and

Which association of anthozoan traits is NOT correct?

The fossil record of Cnidaria is

The polypoid stage of scyphozoans is called ________________.

Which statement about Cnidaria is NOT true?

The body wall of a hydra consists of an outer epidermis and an inner gastrodermis with _______________ between them.

"Glue" cells in ctenophores that function in catching small animals are called ___________.

A hydra moves by

Hermaphroditic sea anemones that produce sperm first and eggs later,to prevent self-fertilization,are called

Throughout most cnidarian groups,the basal or pedal disc serves to

The term "cnidaria" is based on the root words meaning

Consider that you are a biology teacher with limited budget and want to order hydra that can last across many seasons and some irregularity in food supply due to school holidays.You can order regular white hydra or green hydra.Without any further information,which do you order and why?

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

Architectual Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

Acoelomorpha, Platyzoa, and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

Hexapods

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 Distribution

Animal Ecology

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The long thread-like structures that help to overcome prey and provide defense in sea anemones are called .