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BIO LAB: Inverts II
| Question | Answer |
|---|---|
| What is one character that Cnidarians and Platyhelminthes have in common? | - Gastrovascular cavity |
| What are 2 new characters found in Platyhelminthes | - Bilateral Symmetry - Triploblastic |
| What are 3 characters that Nematodes have, but flatworms do not? | - Pseudocoelomate - Dioecious - Complete digestion ( ALIMENTARY CANAL) |
| Triploblastic organisms have the layers of the tissues called? | 1) Ectoderm 2) Endoderm 3) Mesoderm |
| What is the advantage of being bilaterally symmetrical? | - the development of cephalization |
| Platyhelminthes often possesss both male and female sex organs on the same individual. What's the term for this condition? | - Monecious |
| What is the advantage of an organism being monoecious? | - anyone of them could be the mate for eachother |
| What is the difference between acoelomate and pseudocoelomate? | - Acoelomate means no coelom while pseudocoelomate mean partial, lined with mesoderm |
| Anmials that have a body cavity partially surrounded by the mesoderm is considered to have a ________________? | - Pseudocoelomate |
| Which two phylums have acoelomate? | - Syndermata - Nematoda |
| What is the advantage of having a body cavity? | - Having a digestive system and organs in general |
| What does free-living mean? | - Able to live by itself; does not need a host |
| What are the 'free-living' flatworms called? | - Planarians |
| Do free-living Nematoda have a name? | NO?????? (idk) |
| jWhich Animal Phyla can be parasitic on humans? | - Platyhelminthes & Nematoda |
| The specialized excertory cells in flatworms and rodifers are called? | - Flame Cells |
| Why are flame cells necessary in flatworms? | - to help regulate and excrete water |
| Why are flame cells necessatry in rodifiers? | - help regulate water and excrete waste |
| Organisms that are triploblastic and the mouth develops first are called ? | - Protostomes |
| In tapeworms, the function of the scolex is ...? | - to attach to the host's intestine |
| Tapeworms make gametes in body segments called ______________. How are their zygote dispersed? How do they make their way into another human? | - Proglottids - they disperse their zygotes through feces which could spread into the enviornment. They also can affect water ways throuh fecal contamination and also eating undercooked meat (pork). |
| Of the Animal Phyla studied thus far, which ones have an alimentary canal (complete digestion? | - Syndermata - Nematoda |
| The structure in rodifers used for movement and feeding is called ....? | - Corona |
| Two humans disease causes by nematodas are...? | - Trichinosis -Elephantiasis |
| People can avoid the parsites that cause Trichinosis and Elephantiasis by? | - cooking undercook meat properly - avoiding/preventing of mosquitoes (their bites) |
| Rodifers are famous for having only females in the population. They lay unfertilized egss that hatch into females, a phenomenon known as ____________________? | - PARATHENOGENESIS |
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