Term
Cnidaria are...
a) Triploblastic
b) Diploblastic |
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Definition
| b) diploblastic - only 2 germ layers formed - ecto & endo |
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Term
| Respiration is done by...? |
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Definition
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Term
| Digestion and Circulation are done in...? |
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Definition
| the gastrovascular cavity |
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Term
Cnidarians have
a) bilateral symmetry
b) pentaradial symmetry
c) radial symmetry |
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Definition
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Term
What grade of organization are cnidarians?
a) cellular
b) tissue
c) organs |
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Definition
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Term
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Definition
| stinging/sticky cellsfor food capture and defense |
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Term
| Cnidarians have a ___morphic life cycle |
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Definition
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Term
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Definition
| the organelle within the cnidocyte |
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Term
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Definition
| the trigger to release the barb of a cnidocyte |
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Term
| explain the reaction that causes a cnidocyte to disburse its barb |
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Definition
| Ca2+ in nematocyst --> the whole cell gets bumped --> Ca2+ is released, from nematocyst, into cell --> water rushes into cell from outside to regain equilibrium --> cell disburses barb |
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Term
| Dimorphism vs Polymorphism |
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Definition
Dimorphism - Polyp phase
Medusa phase
Polymorphism - Polyp phase
- gonozooid form (w/gonangium and medusa buds)
- gastrozooid form (w hydranth)
- dactylozooid
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Term
| What body structures do both the polyp phase and medusa phase both have, indicating a common body plan? |
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Definition
epidermis
gastrodermis
gastrovascular cavity
mesoglea
tentacles
one mouth/anus |
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Term
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Definition
- polyp feeding form found in polyp colonies
- includes hydranth - feeding tentacles |
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Term
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Definition
- reproductive polyp found in polyp colonies
- AKA gonangium
- includes medusa buds |
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Term
| gastrovascular cavity shared between all forms found in a polyp colony |
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Definition
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Term
| chitonous outer skeleton shared by all forms found in polyp colony |
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Definition
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Term
| - smallest, most ancestral class of cnidarians |
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Definition
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Term
- mostly colonial
- poly phase is dominant
example: hydra |
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Definition
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Term
| Detail the life cycle of Obelia (a hydrozoan) |
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Definition
| polyp colony -> gonozooid releases medusa bud -> male and female release gametes -> zygote -> free-swimming larva ->larva settles and begins new polyp colony |
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Term
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Definition
| 1) Obelia, 2) Velella velella (By-the-Wind Sailor), 3) Portugese Man O' War |
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Term
| Some characteristics of the Portugese Man O' War |
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Definition
- LOOKS like a medusa phase, but is actually a polyp colony
- pneumataphore = gas-filled floaty part
- dactylozooids - look like tentacles but are actually defensive polyps
- gonozooid
- gastrozooid |
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Term
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Definition
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Term
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Definition
| algae that some cnidarians use to photosynthesize food |
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Term
- 4 gastric pouches w/gonads
- Rhopalium acts as an eye spot (light sensor) and statocyst |
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Definition
| Aurelia aurita - aka Moon jelly |
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Term
Detail Life Cycle of Aurelia (moon jelly)
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Definition
| larva settles on rock/under bridge/etc --> scyphistoma (feeding polyp form) --> strobilation to strobila (reproductive form) --> ephyra (baby medusa) -->adult -->larva |
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Term
Class Scyphozoa has
a) only medusa phase present
b) medusa phase dominant, polyp phase reduced
c) polyp phase dominant, medusa phase reduced
d) only polyp phase present |
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Definition
| b) medusa phase dominant, polyp phase reduced |
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Term
- flower-like
- no medusa phase
- anemonies and corals |
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Definition
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Term
| Which organism has septa inside its gastrovascular cavity for increased surface area |
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Definition
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Term
| Describe the hydrostatic skeleton of sea anemonies in Class Anthozoa |
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Definition
contractile cells
-longitudinal layer - contract --> anemone becomes short and fat
-circumferential layer - contract --> anemone becomes tall and skinny |
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Term
- square bell
- velarium
- one of the most deadly organisms in the world
- 4 tentacles
- "eyes" can process images
- medusa phase prominent
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Definition
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Term
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Definition
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Term
-8 rows of cilia used for locomotion
- mouth and anal pore
- nerve net
- 2 tentacles |
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Definition
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Term
| What kind of symmetry does Phylym Ctenophora have? |
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Definition
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