Cnidaria

Question 1

Grade
Phylum
Classes

Answer 1

Grade- Eumetzoa
Phylum- Cnidaria
Classes- Hydrozoa, scyphozoa, anthozoa

Question 2

Characteristics

Answer 2

Dimorphism and polymorphic

Question 3

Stages

Answer 3

Polyp- benthic
Medusa— planktonic
Mesogla- jelly part

Question 4

Class Scyphozoa

Genus-

Answer 4

Genus- Aurelia (regular jelly)

Question 5

Class Anthozoa

Genus-

Answer 5

Genus- Metridium
Sea anemones
No Medusa stage only polyp

Question 6

Class Hydrozoa

Genus-

Answer 6

Genus-
Obelia( colonial)
Hydra (solitary)
Physalia (man of war- colonial)

Question 7

Class scyphozoa
Genus Aurelia
Aurelia life cycle

Answer 7

1. planula larva
2. Scyphistoma
3. Strobila
4. Ephyra
5. Adult Medusa

Question 8

Stinging mechanism

Answer 8

Cnidocytes- form into nematocytes/cnidae

Question 9

Eversion

Answer 9

Firing of the nematocyte

Question 10

Cell types In Gastrovascular cavity of cnidarians

Answer 10

Gland cells

Nutritive-muscle cell

Question 11

Gland cell

Answer 11

In gastroermis, secrete enzymes to break food body into soup

Question 12

Nutritive muscle cells

Answer 12

Phagocytize bits to digest in the food vacuole

Question 13

Dermal layers

Answer 13

Epidedermal

Gastrodermal

Question 14

Epidermal layer

Answer 14

Contractile myofibrils (extra cellular) attached at the NMCells (intracellular)

Question 15

Gastrodermal layer

Answer 15

Circular myofibrils and longitudinal myofibrils

Question 16

Circular myofibrils

Answer 16

Make the Anthozoa taller more water fills the cavity

Question 17

Shape determined by water because…

Answer 17

Incompressible mass of fluid

Question 18

Anthozoa

Answer 18

Can be colonial, use acorhagi for fighting, have super strong nematocysts and fighting tentacles

Caste system
Repro in middle, fighters on outside

Question 19

Achrohagi in Anthozoa

Answer 19

Tentacles used for Fighting

Question 20

Nematocysts relationship

Answer 20

Ready but not fired, curled up inside capsules that are within the cnidocyte. Use once have to mature a new one

Question 21

Body characteristic

Answer 21

Radical body symmetry 
No cephalization( oral and aboral end)
Gastrovascular cavity with 1 opening

Question 22

Cnidocytes

Answer 22

Stinging cells found in epidermis of tentacles

Question 23

Corals and zooxanthelle

Bleaching no zooxanthelle

Answer 23

Mutualism, lives in gastrodermis- photosynthesis converts to organic food matter for coral then coral converts to CO2 for photosynthesis and again