Sea Anemone

Question 1

What is the name of the phylum? and the meaning of it?

Answer 1

Cnidaria, means needle-like

Question 2

Environment of cnidaria?

Answer 2

Aquatic

Question 3

What is the symmetry?

Answer 3

Radial symmetry

Question 4

What are the ends?

Answer 4

There is an oral and aboral ends; no definite head

Question 5

What are the two basic body forms?

Answer 5

Polyp and Medusa

Question 6

Difference between polyp and medusa?

Answer 6

Tentacle is up, like cup is flipped up for Polyp. For medusa, tentacle is down, cup flipped down.

Question 7

What is the skeleton and what is it made of?

Answer 7

Hydrostatic skeleton and made up of calcium carbonate exoskeleton in some

Question 8

What are the three layers?

Answer 8

Epidermis (outside), Gastrodermis, and Mesoglea (middle layer)

Question 9

What is the gastrovascular cavity?

Answer 9

single opening that serves as both mouth and anus

Question 10

Where are the tentacles

Answer 10

encircles mouth or oral region

Question 11

What are the special stinging cells and where is it located?

Answer 11

Cnidocytes in either or both epidermis and gastrodermis; abundant on tentacles

Question 12

Does it have a nervous system?

Answer 12

Yes, nervous system forms nerve net; has some sensory organs

Question 13

How does cnidaria reproduce asexually? What body form does this?

Answer 13

In polyps, asexual budding

Question 14

How does cnidaria reproduce sexually? What body form does this?

Answer 14

By medusa and some polyps, through gametes and planula larva

Question 15

How does cnidaria excrete and respirate?

Answer 15

Diffusion

Question 16

What are the classes?

Answer 16

Hydrozoa, Scyphozoa, Anthozoa, Cubozoa, and Staurozoa

Question 17

What is the characteristic of the class Hydrozoa? Examples?

Answer 17

Solitary or colonial; freshwater and marine. Examples: Hydra, Obelia, Portuguese man-of-war

Question 18

What is the characteristic of the class Scyphozoa?

Answer 18

Solitary; all marine; bell-shaped medusa. Examples: most jellyfish, Aurelia

Question 19

What is the characteristic of the class Anthozoa?

Answer 19

Solitary or colonial; all marine; all polyps; no medusa. Examples: corals (colonial), sea anemones (solitary)

Question 20

What is the characteristic of the class Cubozoa?

Answer 20

Solitary; all marine; bell-shaped medusa square in cross section. Examples: box jellyfish, sea wasp

Question 21

What is the characteristic of the class Staurozoa?

Answer 21

Medusae absent; benthic planula larva; eight tentacles. Example: stalked jellyfish