Phylum Cnidarians

Question 1

Also known as “True Jellyfish”

Answer 1

Class Scyphozoa

Question 2

Also known as “Sea Wasps”

Answer 2

Class Cubozoa

Question 3

Cnidarians have two different body plans which are?

Answer 3

Medusa and polyp

Question 4

Body plan that resembles an upside-down cup or umbrella

Answer 4

Medusa

Question 5

Tubular body plan with tentacle structures

Answer 5

Polyp

Question 6

Cnidarians have __________ symmetry and are ____________

Answer 6

Radial symmetry, diploblastic

Question 7

In Cnidarians, where is the mesoglea found?

Answer 7

In between the epidermis and the gastrodermis

Question 8

True or False

All cnidarians have tentacles around the mouth and a single opening to the digestive system.

Answer 8

True

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Question 9

All cnidarians secrete __________, also called stinging cells.

Answer 9

Cnidae

Question 10

Cnidae is secreted within cells called the ???

Answer 10

Cnidoblast

Question 11

What is the most widespread and best-studied category of cnidae?

Answer 11

Nematocysts

Question 12

Is a cluster of modified cilia that project from the cnidoblast and acts as a TRIGGER for the nematocysts.

Answer 12

Cnidocil

Question 13

The force behind the discharge of the cnidae

Answer 13

Osmotic pressure

Question 14

True or False

Cnidarians are primarily carnivores, but some soft coral species may feed on phytoplanktons.

Answer 14

True

Question 15

What is the difference between Hexacorallina and Octocorallina?

Answer 15

Hexacorallina have 6 tentacles surrounding the mouth while, Octocorallina have 8.

Question 16

Asexual reproduction via strobilation

Answer 16

Class Scyphozoa

Question 17

“muscular cylinder” at the end of the mouth

Answer 17

Manubrium

Question 18

Scyphozoans have a well-developed system of fluid-filled __________________ canal.

Answer 18

Gastrovascular

Question 19

Are short nematocyst bearing tentacles lined around the gastric pouches that secretes digestive enzymes.

Answer 19

Gastric filaments

Question 20

The enzymes partially digest the food and digestion is completed intracellularly through ___________________

Answer 20

Phagocytosis

Question 21

Jellyfishes are equipped with a variety of sensory receptors.

1. __________ - maintains the balance of the jellyfish
2. __________ - optical receptors able to detect light
3. __________ - detects tactile input.

Answer 21

1. Statocysts
2. Ocelli
3. Sensory lappets

Question 22

Statocysts and ocelli are contained in club-shaped structures called the ???

Answer 22

Rhopalia

Question 23

True or False

Gas transfer occurs on the epidermal and gastrodermal surfaces.

Answer 23

True

Question 24

Coiled thread-like stinger

Answer 24

Cnidocytes

Question 25

Thought to be the juvenile of a jellyfish since it gradually changes its appearance becoming an adult scyphozoan

Answer 25

Ephyra

Question 26

Cube-shaped medusa and rhopalia possess complex lensed eyes

Answer 26

Class Cubozoa

Question 27

Species under cubozoa are called

Answer 27

Cubomedusae

Question 28

True or False Like scyphozoans, cubomedusae strobilate.

Answer 28

False, they DO NOT strobilate

Question 29

Common species of cubomedusae

Answer 29

Chironex fleckeri

Question 30

What class? Polyp form is much more represented; gastroderm lacks nematocyst.

Answer 30

Class Hydrozoa

Question 31

In Hydroids, where are the sense organs found?

Answer 31

At the base of the tentacles

Question 32

One difference from scyphozoans is that hydroids possess a tissue called _________ that extends inwards from the edge of the bell.

Answer 32

Velum

Question 33

Give one example of a hydrozoan

Answer 33

Hydra

Question 34

Most hydrozoans are colonial in the polyp stage and gives rise to several polyps called ???

Answer 34

Zooids (also called ‘modules’)

Question 35

Class Hydrozoa The oral end of the polyp.

Answer 35

Hydranth

Question 36

Class Hydrozoa Each zooids share the gastrovascular cavity. They may be connected to one another or the substrate through the ____________. Clue: it’s rootlike

Answer 36

Stolon

Question 37

Class Hydrozoa The stolon are usually encased in a transparent protective tube called the ???

Answer 37

Perisac

Question 38

Class Hydrozoa The “transparent protective tube” covering the “oral end of the polyp” is called the ???

Answer 38

Hydrotheca

Question 39

Hydroid colonies may be _____________ or ______________, meaning that there are several structurally and functionally distinct zooids present in a single colony.

Answer 39

Dimorphic or polymorphic

Question 40

Class Hydrozoa Zooids/modules that are specialized in feeding

Answer 40

Gastrozooids

Question 41

Class Hydrozoa Zooids that are responsible for asexual repoduction by producing medusoid via budding.

Answer 41

Gonozooids

Question 42

Class Hydrozoa Finger-like structures or modules (zooids) that are specialized for defense.

Answer 42

Dactylozooids

Question 43

Class Hydrozoa Zooids that are densely armed with nematocysts but possess no mouth and is dependent on the other zooids for nutrition.

Answer 43

Dactylozooids

Question 44

Class Hydroidolina possess three orders, but order _______________ best represents the polymorphism of the taxon.

Answer 44

Siphonophora

Question 45

These organisms are free-floating hydrozoan colony in which the medusoid and polypoid morphs are observed simultaneously.

Answer 45

Order Siphonophora

Question 46

Order Siphonophora Propels the colony through jet propulsion by a structure called ???

Answer 46

Nectophore

Question 47

Order Siphonophora The medusa may also appear as leaf-like structures called ???

Answer 47

Bracts or phyllozooids

Question 48

Order Siphonophora Some species possess gas-filled structures that allow them to float called the ???

Answer 48

Pneumatophores

Question 49

A small group of colonial hydrozoans that secrete calcareous skeletons resembling corals, however they are not true corals.

Answer 49

Order Hydrocorallina

Question 50

Are spore forming parasites under phylum cnidaria

Answer 50

Class Myxozoa

Question 51

Class Myxozoa They possess distinctive organelles called ________________ and several of these are coiled together within the _________________

Answer 51

Polar filaments, polar capsules

Question 52

They LOOK LIKE modified medusoids but live in polyp form. BUT, they have no medusoid morph in ther life cycle

Answer 52

Class Staurozoans

Question 53

Are called “mini harpoons” and also contains the toxin to be injected

Answer 53

Cnida

Question 54

Types of Nematocysts

Answer 54

Penetrant, Volvent, Glutinant

Question 55

Types of Nematocysts Not only penetrates the victim, but also injects a poison.

Answer 55

Glutinant

Question 56

Types of Nematocysts Wraps around and ensnares a victim

Answer 56

Volvent

Question 57

Scientific name of Moon Jellies

Answer 57

Aurelia aurita

Question 58

Scientific name of Upside down jellyfish

Answer 58

Cassiopea sp.

Question 59

Scientific name of Australian Box Jellyfish

Answer 59

Chironex fleckeri

Question 60

Scientific name of Wind Sailor Jellyfish

Answer 60

Velella velella