Cnidaria

Question 1

What is the grade of Cnidaria?

Answer 1

Eumetazoa

Question 2

What classes make up the phylum Cnidaria?

Answer 2

Hydrozoa, Scyphozoa and Anthozoa

Question 3

Hydrozoa are made up of…

Answer 3

Hydra, Physalia and Obelia

Question 4

Scyphozoa are made up of…

Answer 4

Aurelia

Question 5

Anthozoa are made up of…

Answer 5

Metridium

Question 6

Which two genuses of Hydrozoa are colonial?

Answer 6

Physalia and Obelia

Question 7

What two germ layers do Cnidarians possess?

Answer 7

epidermis and gastrodermis

Question 8

The name of the jelly-like substance between the two germ layers is called

Answer 8

mesoglea

Question 9

The ability to have two body morphs is referred to as

Answer 9

bimorphic

Question 10

The polyp body morph is

Answer 10

sessile (attached) and benthic (at the bottom)

Question 11

The medusa body morph is

Answer 11

floating and planktonic (floats along the H2O column)

Question 12

The kind of body symmetry that Cnidarians possess is

Answer 12

radial

Question 13

The digestive systems of Cnidarians is

Answer 13

incomplete with no cephalization

Question 14

Stinging cells found in Cnidarians are called

Answer 14

cnidocytes

Question 15

Stinging organelles found in Cnidarians are called

Answer 15

nematocysts. They are found coiled within cnidocytes

Question 16

What causes nematocysts to fire?

Answer 16

tactile and chemical stimulation

Question 17

Why are nematocysts used?

Answer 17

for prey capture and self-defense

Question 18

The colonial Portuguese Man of War is an example of which Cnidarian genus?

Answer 18

Physalia

Question 19

Gastrozoids in Physalia are which kind of polyp? What are they called in Obelia?

Answer 19

feeding polyps hydranths

Question 20

Ganozoids in Physalia are which kind of polyp? What are they called in Obelia?

Answer 20

reproductive polyps gogangium

Question 21

Dactylozoids in Physalia are which kind of polyp?

Answer 21

prey capture polyps due to their tentacles

Question 22

What is the purpose of the septa in sea anemone?

Answer 22

it is the internal partition in the organism and increases surface area for digestion

Question 23

Metridium examples are

Answer 23

corals and sea anemones

Question 24

Pictured is which stage of the Aurelia life cycle?

Answer 24

Planula Larva

Question 25

Pictured is which stage of _Aurelia_?

Answer 25

Scyphistoma

Question 26

Pictured is which stage of the _Aurelia_ life cycle?

Answer 26

Strobila

Question 27

Pictured is which stage of the _Aurelia_ life cycle?

Answer 27

Ephyra

Question 28

Pictured is which stage of the _Aurelia_ life cycle?

Answer 28

Adult Medusa

Question 29

Pictured is...

Answer 29

_Physalia_ tentacles

Question 30

Pictured is...

Answer 30

Hydra budding

Question 31

Pictured is...

Answer 31

_Hydra_ gonads

Question 32

Which stages of the _Aurelia_ life cycle are benthic?

Answer 32

scyphistoma and strobila

Question 33

Which stages of the Aurelia life cycle are planktonic?

Answer 33

planula larva, ephyra and adult medusa

Question 34

What are the different members of the _Physalia_ colony?

Answer 34

the feeding polyps (Gastrozoids) the reproductive polyps (Gonozoids) the polyps with tentacles (Dactylozoids)

Question 35

Name the numbered structures.

Answer 35

2. Tentacle 6. ectoderm (epidermis) 7. endoderm (gastrodermis) 8. gullet 9. primary mesentery 10. pores 11. gastrovascular cavity 12. mesenterie filament 13. acontia 14. secondary mesentery 15. tertiary mesentery 17. gonads 18. body wall 19. basal disks

Question 36

Name the numbered structures

Answer 36

1. Gastrodermis 2. Epidermis 3. Mesoglea 4. Mouth 5. Hypostome 6. Basal disk 7. Tentacles 8. Ovary 9. Testis 10. Gastrovascular cavity 11. Bud

Question 37

Name the numbered structures

Answer 37

1. Gastrodermis 2. Epidermis 3. Mesoglea 10. Gastrovascular cavity 12. Nutritive Muscular Cells 13. Food particle being engulfed 14. Gland cell 15. Epitheliomuscular Cells 16. Interstital Cells 17. Cnidoblasts/Cnidocytes 18. Circular Muscle fibril 19. Longitudinal Muscle fibril 20. Neurons

Question 38

Name the numbered structures

Answer 38

1. Epidermis (ectoderm) 2. Coelenteron 3. Mesoglea 4. Gastrodermis (endoderm)

Question 39

Name the numbered structures

Answer 39

1. Coelenteron 2. Testes 3. Epidermis (ectoderm) 4. Gastrodermis (endoderm)

Question 40

Which gender of Hydra is pictured? Name the numbered structures.

Answer 40

male 1. Tentacles 2. Testes

Question 41

Which gender of Hydra is pictured? Name the numbered structures.

Answer 41

female 1. Tentacles 2. Ovary 3. Basal disk (foot)

Question 42

Name the numbered structures.

Answer 42

1. Tentacles 2. Bud 3. Hypostome 4. Basal disc (foot)