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Worm Exam

Phyla Platyhelminthes, Nematoda and Annelida

QuestionAnswer
What is the body plan of a platyhelminthes? bilateral, acoelomate - no body cavity, 3 cell laters: mesoderm, endoderm, ectoderm, no circulatory or respiratory system.
What is the body plan of nematode? bilateral, pseudocoelomate - body cavity, 3 cell layers, have complete digestive system with mouth and a anus, no circulatory or respiratory system.
What is the body plan of an annelid? bilateral, coelomate - true body cavity, 3 cell layers, segmented bodies, have all organ systems
Define hermaphrodite: an organism that has both male and female reproductive parts that are functional
Give three general characteristics of flatworms: cephalized head, no body cavity, one opening: mouth, pharynx, eyespots to detect light.
Give three general characteristics of roundworms: bodies shaped like pencils sharpened at both ends, complete digestive system, separate sexes, some are parasitic, two openings: mouth and an anus - complete digestive system
Give three general characteristics of annelids: segmented bodies, paired appendages, parapodia, setae (bristles)
Define acoelomate: an organism with no body cavity
Define pseudocoelomate: an organism with a body cavity whose organs are not supported by mesodermal tissue
Define coelomate: an organism with a true body cavity and organs and organ systems are supported by mesodermal tissue
What are the three classes of flatworms and give an example of each? Turbellaria - Planarians, Trematoda - Blood flukes, Cestoda - tapeworms
How do flatworms reproduce? Asexual by regeneration and sexual by exchange of sperm
How do roundworms reproduce? Sexes are separate. Fertilization occurs in the body of the female.
How do segmented worms reproduce? Most reproduce sexually, some have separate sexes, some are hermaphrodites (asexual)
Draw a diagram of an Earthworm and label: aortic arches, brain, pharynx, esophagus, seminal receptables, crop, gizzard, setae, clitellum, seminal vesicles and intestine.
Define aortic arches: large, muscular tubes that alternately contract and relax, keeping blood flowing
Define seminal vesicles: reproductive organs which store sperm
Define Intestine: a tube responsible for the passage of waste products and absorption of nutrients
Define Clitellum: a swelling that produces a protective slim ring that covers the fertilized eggs as they are laid
Define setae: bristles used for locomotion
Define gizzard: a muscular organ containing grans of sand used to grind up food
Define crop: a round organ used to temporarily store food
Define pharynx: tubelike structure through which soil and food particles pass
Esophagus: a tubelike structure which food passes through to the stomach
Nepridium: one of many openings through which wastes are passed to the outside of the body
What are the three tissue layers and what tissues do they give rise to (or make)? ectoderm gives rise to skin tissues and nervous system mesoderm gives rise to skeletal, muscular, reproductive systems Endoderm gives rise to digestive system
What is cephalization? sensory information is contained in the head region of the animal (i.e. eyes, mouth, ears)
What is regeneration? The ability of an organization to replicate itself (grow whole organism) which is a type of asexual reproduction. Growing back of body structures.
Created by: jlafferty