Question 1

The correct sequence in the life cycle of the jellyfish Aurelia is

Accepted Answer

A) planula,ephyra,scyphistoma. 
B) scyphistoma,planula,ephyra. 
C) planula,scyphistoma,ephyra. 
D) ephyra,planula,scyphistoma. 
E) None of the choices is correct 
A) planula,ephyra,scyphistoma. 
B) scyphistoma,planula,ephyra. 
C) planula,scyphistoma,ephyra. 
D) ephyra,planula,scyphistoma. 
E) None of the choices is correct C

Question 2

Gastric filaments bearing _________________ are found in scyphozoan medusae.

Accepted Answer

nematocysts

Question 3

Ctenophores capture food by

Accepted Answer

A) nematocysts. 
B) collenchyme. 
C) colloblasts. 
D) comb plates. 
E) statocysts. 
A) nematocysts. 
B) collenchyme. 
C) colloblasts. 
D) comb plates. 
E) statocysts. C

Question 4

Hydra reproduces asexually by

Accepted Answer

A) buds. 
B) nematocysts. 
C) gland cells. 
D) gametes. 
E) gastrozooids. 
A) buds. 
B) nematocysts. 
C) gland cells. 
D) gametes. 
E) gastrozooids.

Question 5

The function of the siphonoglyph is

Accepted Answer

A) to form water currents into the gastrovascular cavity. 
B) to sting the prey. 
C) to aid in swimming. 
D) to maintain balance or orientation. 
E) reproduction. 
A) to form water currents into the gastrovascular cavity. 
B) to sting the prey. 
C) to aid in swimming. 
D) to maintain balance or orientation. 
E) reproduction.

Question 6

Cnidarians are found most abundantly in which of the following habitats?

Accepted Answer

A) Shallow marine habitats 
B) Freshwater habitats 
C) Deep ocean habitats 
D) Estuary habitats 
E) None of the choices is correct 
A) Shallow marine habitats 
B) Freshwater habitats 
C) Deep ocean habitats 
D) Estuary habitats 
E) None of the choices is correct

Question 7

The Portuguese man-of-war has long tentacles with many nematocysts.These tentacles are called

Accepted Answer

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

Question 8

Sea anemones and corals lack

Accepted Answer

A) a sexual stage. 
B) an asexual stage. 
C) a polyp stage. 
D) a medusa stage. 
E) None of the choices is correct 
A) a sexual stage. 
B) an asexual stage. 
C) a polyp stage. 
D) a medusa stage. 
E) None of the choices is correct

Question 9

The gastrodermal tubes that run through the extensive mesoglea of alcyonarians are called _______________.

Accepted Answer

The answer of The gastrodermal tubes that run through the...

Question 10

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 11

The part of a coral reef that slopes down into the lagoon is the ________ ________ or fore reef slope.

Accepted Answer

The answer of The part of a coral reef that...

Question 12

Nematocysts are stinging organelles contained inside cells called __________________.

Accepted Answer

The answer of Nematocysts are stinging organelles contained inside cells...

Question 13

To help overcome prey,some sea anemones have ____________ with nematocysts and gland cells that protrude through the mouth or pores.

Accepted Answer

A) acontia threads 
B) siphonoglyphs 
C) pedal lacerations 
D) strobila 
E) pneumatophores 
A) acontia threads 
B) siphonoglyphs 
C) pedal lacerations 
D) strobila 
E) pneumatophores

Question 14

The class of radiate animals with the most conspicuous medusa stage is

Accepted Answer

A) hydrozoa. 
B) scyphozoa. 
C) anthozoa. 
D) ctenophora. 
E) cubozoa. 
A) hydrozoa. 
B) scyphozoa. 
C) anthozoa. 
D) ctenophora. 
E) cubozoa.

Question 15

Discuss the evidence for the phylogenetic placement of Ctenophores and Cnidarians in the metazoan tree.

Accepted Answer

The phylogenetic placement of Ctenophore

Question 16

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 17

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

Accepted Answer

The answer of The mesoglea of scyphozoans has amoeboid cells...

Question 18

The _____ stage is best adapted for cnidarians living in colonies while the ____ stage helps in dispersal and survival in open oceans.

Accepted Answer

A) gastrozooid,dactylozooid 
B) lappet,rhopalium 
C) medusa,polyp 
D) polyp,medusa 
E) dactylozooid,gastrozooid 
A) gastrozooid,dactylozooid 
B) lappet,rhopalium 
C) medusa,polyp 
D) polyp,medusa 
E) dactylozooid,gastrozooid

Question 19

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

Question 20

Which of the following is NOT a correct description of cnidarian nervous tissues?

Accepted Answer

A) Hydrozoan medusae have ring nerves 
B) Scyphozoan medusae have marginal sense organs 
C) The nerve net synapses with both the nematocysts and the epitheliomuscular cells 
D) Scyphozoa have both a fast conducting and a slow conducting system to coordinate movements 
E) Cnidaria are the first animals to develop a central nervous system 
A) Hydrozoan medusae have ring nerves 
B) Scyphozoan medusae have marginal sense organs 
C) The nerve net synapses with both the nematocysts and the epitheliomuscular cells 
D) Scyphozoa have both a fast conducting and a slow conducting system to coordinate movements 
E) Cnidaria are the first animals to develop a central nervous system

Exam 13: Cnidarians and Ctenophores

The correct sequence in the life cycle of the jellyfish Aurelia is

Gastric filaments bearing _________________ are found in scyphozoan medusae.

Ctenophores capture food by

Hydra reproduces asexually by

The function of the siphonoglyph is

Cnidarians are found most abundantly in which of the following habitats?

The Portuguese man-of-war has long tentacles with many nematocysts.These tentacles are called

Sea anemones and corals lack

The gastrodermal tubes that run through the extensive mesoglea of alcyonarians are called _______________.

Which of the following is a characteristic of stauromedusans?

The part of a coral reef that slopes down into the lagoon is the ________ ________ or fore reef slope.

Nematocysts are stinging organelles contained inside cells called __________________.

To help overcome prey,some sea anemones have ____________ with nematocysts and gland cells that protrude through the mouth or pores.

The class of radiate animals with the most conspicuous medusa stage is

Discuss the evidence for the phylogenetic placement of Ctenophores and Cnidarians in the metazoan tree.

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

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

The _____ stage is best adapted for cnidarians living in colonies while the ____ stage helps in dispersal and survival in open oceans.

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

Which of the following is NOT a correct description of cnidarian nervous tissues?

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 part of a coral reef that slopes down into the lagoon is the or fore reef slope.

The _ stage is best adapted for cnidarians living in colonies while the stage helps in dispersal and survival in open oceans.