Complete questions on Coloring sheet for tomorrow. Complete ‘Scramble Words’ Vocabulary sheet...
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![Page 1: Complete questions on Coloring sheet for tomorrow. Complete ‘Scramble Words’ Vocabulary sheet for Wednesday. Quiz on Thursday on the vocabulary for Annelida.](https://reader035.fdocuments.in/reader035/viewer/2022062322/56649ebe5503460f94bc7f1c/html5/thumbnails/1.jpg)
•Complete questions on Coloring sheetfor tomorrow.
•Complete ‘Scramble Words’ Vocabularysheet for Wednesday.
•Quiz on Thursday on the vocabulary forAnnelida
![Page 2: Complete questions on Coloring sheet for tomorrow. Complete ‘Scramble Words’ Vocabulary sheet for Wednesday. Quiz on Thursday on the vocabulary for Annelida.](https://reader035.fdocuments.in/reader035/viewer/2022062322/56649ebe5503460f94bc7f1c/html5/thumbnails/2.jpg)
The segmented worms
“annelus” - little ring I’m metameric
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3 classes of AnnelidaClass Polychaeta – mostly marine fanworms, bristle worms, tube worms
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Feather duster worms ( Polychaetes)Filter feeder
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Class Oligochaeta - earthworms
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Class Hirudinea - leeches
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General characteristics• segmented body
• coelomate
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•Longitudinal and circular muscles
• Setae/ bristles used for locomotion
•Soft bodies – hydrostatic skeleton
• Bilateral symmetry
Respiration:•In feather duster worms – gills•Earthworms – moist skin
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Specialized structures: Ex. Earthworm•Prostomium – used for sensingand digging through the soil.
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•Earthworms have a closed circulatory system:
•Blood flow in blood vessels – dorsal and ventral.• They have 5 pumping ‘hearts’ calledpseudo-hearts or aortic arches. (Color red)
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Segments
Segments
Segments
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•Digestive system: Mouth, Pharynx, Esophagus,•Crop (store food), gizzard (ground up food), intestine (digestion), anus (excretion) Color Green
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•Nephridia for excretion•Clitellum – Secretes mucous ring forfertilization.
•Ganglia form ‘brain’. Has a ventral nerve cord. Color Blue
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Nephridia – Helps with excretion of nitrogen containing wastes.
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Reproduction: Example - Earthworm•Sexual reproduction•Hermaphrodites – Male and Female reproductivestructures.Eggs produced in ovaries•Worms exchange sperm:Sperm produced in testes.Seminal receptacles receive the sperm from the other worm during mating.Seminal vescicles store sperm from other worm.•External fertilization in a mucous ring which becomes a cocoon. Mucous ring forms at clitellum.
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MaleFemale
Male
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http://www.sciencelearn.org.nz/Science-Stories/Earthworms/Sci-Media/Video/Physical-adaptations-for-life-underground
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Mode of nutrition:
Some are filter feeders – Tube wormsSome are carnivores – Nereis
Earthworms feed on decaying vegetation.
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Movement:•Body muscles and a hydrostatic Skeleton.•Marine annelids have parapodiaUsed for swimming and crawling
•Earthworms have bristle likeSetae to help with movement.