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Zoology Unit 3
Zoo Unit 3 Worms
| Question | Answer |
|---|---|
| Phylum Platyhelminthes | group of animals including the flatworms (planaria and tapeworms) |
| Phylum Nematoda | group of animals including the parasitic roundworms |
| Phylum Annelida | group of animals including the segmented worms |
| Class Turbellaria | type of flatworm including the free-living planaria |
| Class Cestoda | type of flatworm including the parasitic tapeworms |
| cilia | tiny hairlike structures on the outer covering of flatworms like the planaria |
| incomplete | type of digestive system in the planaria; waste is excreted from the mouth |
| skin | where oxygen enters all types of worms |
| ocelli | structure of planaria sensitive to light; also called eyespots |
| ganglion | a group of nerve cells; also known as a primitive brain |
| regeneration | form of asexual reproduction where animals can regrow lost parts |
| proglottids | reproductive parts of a tapeworm that are shed in feces as the worm matures in the host |
| pharynx | the throat of an animal; can be egested in planaria |
| gastrovascular cavity | part of a planaria and other simple animals that transports nutrients throughout the body |
| scolex | head of the tapeworm |
| hooks or suckers | how parasitic tapeworms attach to the host |
| primary host | organism in which parasites mature and reproduce sexually |
| intermediate host | organism in which parasites reproduce asexually and spend a short time of their development |
| complete | type of digestive system with a mouth and an anus; food and waste do not use the same entrance/exit |
| acoelomate | lack body cavity; found in platyhelminthes |
| pseudocoelomate | type of body cavity in nematoda |
| coelomate | type of body cavity in annelids |
| hydrostatic skeleton | body structure and movement is made possible by the pressure of water in the body cavity of an organism |
| closed | type of circulatory system in which blood is held in vessels separate from other body fluids found in the body cavity |
| aortic arches | blood vessels of annelids that contract to pump blood through the body; simple heart |
| setae | bristles or hairs that anchor earthworms in their burrows |
| aeration | ability for a worm to make burrows that allow for air circulation in the soil; helps plants grow in soil |
| crop | where food is stored in the digestive cavity of annelids |
| gizzard | where food is ground up in the digestive cavity of annelids |
| intestine | where nutrients are absorbed in an animals digestive tract |
| nerve cord | a primitive/simple spinal cord as found in many invertebrates; transmits electrical signals through the body of an animal |
| nephridia | tubule that filters waste and water for excretion by simple animals; a primitive kidney |
| excretory pores | where liquid waste leaves the body of some simple animals such as earthworms |
| clitellum | the portion of the earthworm that develops at sexual maturity and is shed as an egg sac for external development of offspriringng |
Created by:
Mrs. Meeks SHS
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