Cnidaria

Front 1

What level of biological organization do cnidarians have?

Back 1

Tissue

Front 2

What type of symmetry do Cnidarians have? What advantage does this have

Back 2

Radial- sensory distribution on all side

Front 3

List and define the 3 tissue layers of Cnidarians.

Back 3

Epidermis
Mesoglea
Gastrodermis

Front 4

Cnidocytes

Back 4

stinging structures in tentacles, whole structure

Front 5

Cnida

Back 5

contains a coiled, hollow, usually barbed thread, CAPSULE

Front 6

Nematocyst

Back 6

A capsule within specialized cells of certain coelenterates, such as jellyfish, containing a barbed, threadlike tube that delivers a paralyzing sting when propelled into attackers and prey. Also called stinging cell. BARBED THREAD

Front 7

Cnidocil

Back 7

a hairlike sensory process projecting from the surface of a cnidoblast, believed to trigger the discharge ofthe nematocyst.

Front 8

What type of larvae do all cnidarians produce?

Back 8

Planula

Front 9

Briefly describe the sensory system of Cnidarians

Back 9

Lack brain, have nerve cells that connect to create nerve net which transmits impulses, Statocysts- sense of balance

Front 10

Define alternation of generations and provide an example from within the Phylum Cnidaria, being sure to list the name and type of reproduction within each stage.

Back 10

Male & Female brodacast sperm- creates embryo-planula-young colony- reproductive release medusae

Front 11

List the 4 classes of Cnidarians

Back 11

Hydrozoans
Anthozoans
scyphozoa
cubozoa

Front 12

What anatomical aspect distinguishes Class Anthozoa from other cnidarians?

Back 12

Septa- thin partion allowing for larger polyps, digestion of larger prey

Front 13

List the 4 different reproductive strategies found within Class Anthozoa

Back 13

-Fission
-Pinching
-Budding
- Pedal Laceration

Front 14

What are acrorhagi?

Back 14

Fighting tentacles found in Anthozoa

Front 15

List 4 ecological roles of Cnidarians, providing an example for each.

Back 15

Prey
Predator
Biogenic Habitats
Symbiosis -Zooxanthellae & coral

Front 16

Symbiotic

Back 16

A close, prolonged association between two or more different organisms of different species that may, but does not necessarily, benefit each member.

Front 17

Commensalism

Back 17

one organism benefits without affecting the other

Front 18

Parasitism

Back 18

one organism, the parasite, benefits at the expense of the other, the host

Front 19

obligate mutualism

Back 19

interdependent with one another in a way that one cannot survive without the other

Front 20

Facultative mutualism

Back 20

derive benefit from each other but not being fully dependent that each cannot survive without the symbiotic partner

Front 21

Provide 3 examples of mutualism within the Cnidarian phylum, listing each of the two partners and how they benefit.

Back 21

Hermatypic corals (the ones that form coral reefs) have symbiotic zooxanthellae (unicellular algae) within their tissues; the algae receive protection and housing from the polyps, and enable them to produce their calcareous exoskeleton.
There are sea anemones that attach to the dorsum of crabs, marine snails, etc. Thus the anemone "travels free" and the other animal is protected.
Many species of small fishes and crustaceans shelter beneath the umbella of some jellyfish (read example at the link).