Question 1

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. D

Question 2

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. C

Question 3

The mesoglea of scyphozoans has ameboid cells and fibers and is called a __________________.

Accepted Answer

mesenchyme

Question 4

Which of the following is NOT a correct association?

Accepted Answer

A)  Nematocyst-stinging organelle 
B)  Operculum-lid covering the capsule containing the coiled thread 
C)  Cnidoblast-a developing cnidocyte 
D)  Cnidocil-poison gland 
E)  Hydrostatic pressure-pressure inside capsule that forces the nematocyst out 
A)  Nematocyst-stinging organelle 
B)  Operculum-lid covering the capsule containing the coiled thread 
C)  Cnidoblast-a developing cnidocyte 
D)  Cnidocil-poison gland 
E)  Hydrostatic pressure-pressure inside capsule that forces the nematocyst out

Question 5

Which of the following is a characteristic of stauromedusans?

Accepted Answer

A)  They have a solitary polyp body 
B)  The top of the polyp has nine extensions 
C)  Polyps reproduce asexual 
D)  The planula swims initially and then becomes sessile 
E)  They do not have a mouth 
A)  They have a solitary polyp body 
B)  The top of the polyp has nine extensions 
C)  Polyps reproduce asexual 
D)  The planula swims initially and then becomes sessile 
E)  They do not have a mouth

Question 6

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 7

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 8

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 9

Septa extending from the body wall to the pharynx in sea anemones are designated primary septa or ________________.

Accepted Answer

The answer of Septa extending from the body wall to...

Question 10

The traditional view of cnidarians relative to germ layers is that cnidaria possess

Accepted Answer

A)  only one germ layer, the ectoderm, that differentiates into the two tissue layers. 
B)  two germ layers, ectoderm and mesoderm. 
C)  two germ layers, endoderm and mesoderm. 
D)  two germ layers, ectoderm and endoderm. 
E)  definitely all three germ layers including the mesoglea as it is derived from ectoderm. 
A)  only one germ layer, the ectoderm, that differentiates into the two tissue layers. 
B)  two germ layers, ectoderm and mesoderm. 
C)  two germ layers, endoderm and mesoderm. 
D)  two germ layers, ectoderm and endoderm. 
E)  definitely all three germ layers including the mesoglea as it is derived from ectoderm.

Question 11

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 12

Describe the trigger mechanism and the process by which nematocysts are ejected at terrific pressure.

Accepted Answer

Nematocysts are specialized stinging org

Question 13

"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 14

The fishing tentacles in the Portuguese manofwar are long tentacles with many nematocysts called

Accepted Answer

A)  dactylozooids. 
B)  gastrozooids. 
C)  gonophores. 
D)  pneumatophores. 
E)  colloblasts. 
A)  dactylozooids. 
B)  gastrozooids. 
C)  gonophores. 
D)  pneumatophores. 
E)  colloblasts.

Question 15

A pharynx and mesenteries are structures found in

Accepted Answer

A)  hydra. 
B)  sea anemones. 
C)  aurelia. 
D)  obelia. 
E)  cubozoans. 
A)  hydra. 
B)  sea anemones. 
C)  aurelia. 
D)  obelia. 
E)  cubozoans.

Question 16

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 17

A/An ____________________ encircles a lagoon but there is no central island.

Accepted Answer

A)  atoll 
B)  barrier reef 
C)  bank or patch reef 
D)  fringing reef 
E)  reef crest 
A)  atoll 
B)  barrier reef 
C)  bank or patch reef 
D)  fringing reef 
E)  reef crest

Question 18

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

Question 19

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 20

A/An ____________________ is close to the land and has either no lagoon or a very shallow lagoon.

Accepted Answer

A)  atoll 
B)  barrier reef 
C)  bank or patch reef 
D)  fringing reef 
E)  reef crest 
A)  atoll 
B)  barrier reef 
C)  bank or patch reef 
D)  fringing reef 
E)  reef crest

Exam 13: Radiate Animals

A hydra moves by

The fossil record of Cnidaria is

The mesoglea of scyphozoans has ameboid cells and fibers and is called a __________________.

Which of the following is NOT a correct association?

Which of the following is a characteristic of stauromedusans?

How does Hydra reproduce sexually?

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

Which statement about Cnidaria is NOT true?

Septa extending from the body wall to the pharynx in sea anemones are designated primary septa or ________________.

The traditional view of cnidarians relative to germ layers is that cnidaria possess

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

Describe the trigger mechanism and the process by which nematocysts are ejected at terrific pressure.

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

The fishing tentacles in the Portuguese manofwar are long tentacles with many nematocysts called

A pharynx and mesenteries are structures found in

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.

A/An ____________________ encircles a lagoon but there is no central island.

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?

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

A/An ____________________ is close to the land and has either no lagoon or a very shallow lagoon.

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

Acoelomorpha,Platyzoa,and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Annelids and Allied Taxa

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

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