Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Ctenophora and more
Notes on phyla, Cnidaria, and ctenophora in marine biology.
| Question | Answer |
|---|---|
| What is cnidaria? | The phylum that consists of multicellular organisms with cnidocytes and radial symmetry such as sea anemones, corals, and jelly fish. |
| What is radial symmetry? | Symmetry around a point that is repeated that cnidarians possess typically with the point around the mouth or tentacles |
| What 2 body forms do cnidarians possess? | The polyp and the medusae |
| What are cnidocytes? | Specialised stinging cells for capturing prey |
| What do cnidarians lack? | Organs, including a brain |
| What diets do most cnidarians have? | Most are carnivores |
| What do cnidarians use to capture prey? | Nematocysts, their stinging cells |
| What is a cnidarian's nervous system? | Instead of a CNS, they have a nerve net which is interconnected neurons that transmit information and respond to stimuli |
| Do cnidarians have true consciousness? | No, unlike most animals, due to their lack of brains, they do not have a true consciousness but rather act like cells |
| What is a polyp body form? | A stage where a cnidarian is sessile or fixed in one place, is sac like, and has a mouth and pointed up tentacles that can be a lone wolf or in a colony. |
| What is a medusa body form? | A stage where a cnidarian is a bell or umbrella shape that tentacles that hand down and is free swimming. Jellyfish being an example. |
| What 2 body layers do cnidarians have? | The epidermis, which is the external layer, and the gastrodermis, the guy lining layer. |
| What is between the epidermis and gastrodermis of cnidarians? | A layer called mesoglea |
| Where are cnidarians' mouths? | They are centrally located |
| What do cnidarians use their tentacles for? | Capturing food |
| What does a cnidarian's mouth open up to? | Their gastrovascular cavity |
| What are nematocysts? | Tiny, stinging structures that are triggered by mechanical stimulation that are at first coiled ready to be fired and then released when stimulated. |
| Where are nematocysts found? | They are found within cnidocytes. |
| What are cnidocytes? | Specialised cells in the tentacles of cnidarians. |
| What are nematocysts used for? | Capturing prey and defending against predators. |
| What are hydrozoans? | A part of the class hydrozoa that is polyp dominant. |
| What body form does a larval stage hydrozoan have? | Medusae |
| What body form does an adult stage hydrozoan have? | Polyp |
| Are hydrozoan species solitary or colonial? | Some are solitary, some are colonial |
| What are zooids? | Polyps with different morphological forms that make of colonial cnidarian which perform different functions for feeding, reproduction, and defence like different organs. |
| What do hydrozoans produce through sexual reproduction? | Planular larvae |
| What are planular larvae | Larvae of hydrozoans that swim for reproduction of the hydrozoans |
| What are some examples of hydrozoans? | Portuguese Man O' War, Fire Coral |
| What are scyphozoans? | A part of the class scyphozoa that consist of the larger "true" jellyfish, and is medusae dominant with a rounded bell shape. |
| What is the dominant stage/body shape of a scyphozoan's life cycle? | The medusae |
| How long can sycphozoans that live in the deep ocean grow? | Up to 3 metres wide |
| How do scyphozoans swim? | Using rhythmic contractions of the bell |
| What can stop a scyphozoan from swimming when using bell contraction? | The strength of ocean currents |
| What are some examples of jellyfish | Moon jellies, pacific sea nettle, and crown jelly |
| What are cubozoans? | Species that are part of the class cubozoa that consist of box jellyfish and sea wasps. |
| What are some characteristics of cubozoans? | They are mostly transparent, shaped like a cube, and have a minimum of 4 tentacles. |
| Why are cubozoans considered the most dangerous marine organisms? | They have powerful stings that can be lethal |
| Where are cubozoans mostly found? | Australia |
| What are anthozoans? | Species from the class anthozoa that is mostly polyp dominant. |
| What species are anthozoans? | Corals, anemones, and sea fans |
| What are coral exoskeletons made of? | Calcium carbonate (CaCo3) |
| Where are anthozoans found? | Intertidal zones |
| What do sea anemones usually have? | large, colourful polyps |
| What are octocorals? | Also called soft corals, corals that do not build a calcium carbonate skeleton. |
| What do octocorals have instead of a calcium carbonate skeleton? | An internal structural support so they can sway with the currents |
| What kind of symmetry do octocorals have? | 8-fold symmetry meaning their tentacles come in groups of 8 |
| What are ctenophores? | A phylump of ctenophora and consist of comb jellies |
| How do ctenophores swim? | Using 8 ciliary combs that are fused at the base |
| What are ctenophores mostly and exclusively? | Mostly planktonic and exclusively marine |
| What are ctenophores are characterised by? | 8 rows of ciliary which are used for locomotion |
| What do ctenophores lack? | Stinging cells |
| How do ctenophores capture prey if they don't have stinging cells? | They use colloblasts, which are sticky cells |
| What are colloblasts? | Sticky cells used by ctenophores used to capture prey. |
Created by:
CommsMKSoz
Popular Ecology sets