1 / 33


Worms. Chapter 1 Section 4. What Worms have in Common. What are the 3 major phyla of worms we are discussing? Flatworms Roundworms Segmented worms. Flatworm. http:// img.ehowcdn.com/article-new/ehow/images/a05/70/fq/symptoms-tapeworms-horses-800x800.jpg.

Download Presentation


An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.


Presentation Transcript

  1. Worms Chapter 1 Section 4

  2. What Worms have in Common • What are the 3 major phyla of worms we are discussing? • Flatworms • Roundworms • Segmented worms

  3. Flatworm http://img.ehowcdn.com/article-new/ehow/images/a05/70/fq/symptoms-tapeworms-horses-800x800.jpg http://www.astrographics.com/GalleryPrints/Display/GP2104.jpg

  4. Flatworms http://aapredbook.aappublications.org/content/1/SEC131/SEC269/F2258.large.jpg http://www.freeendlessinfo.com/wp-content/uploads/2012/04/caninetapeworms.jpg

  5. Flatworm http://www.daviddarling.info/images/flatworm_section.jpg http://upload.wikimedia.org/wikipedia/commons/2/2a/NZ_Flatworm.JPG

  6. Roundworm http://www.petsandparasites.org/images/uploads/images/AscaridInIntestine.gif

  7. Segmented Worms http://www.arcodiv.org/seabottom/images/orange_ploychaet_400x300.jpg http://www.emc.maricopa.edu/faculty/farabee/biobk/annelidbody.gif

  8. Segmented Worms http://ichef.bbci.co.uk/naturelibrary/images/ic/credit/640x395/a/an/annelid/annelid_1.jpg

  9. Segmented Worms http://www.historyforkids.org/scienceforkids/biology/animals/segmentedworms/pictures/earthworm.jpg

  10. What Worms have in Common • Which phylum do flatworms belong to? • Platyhelminthes • Which phylum do roundworms belong to? • Nematoda • Which phylum do segmented worms belong to? • Annelida

  11. What Worms have in Common • Invertebrates • Long, narrow bodies without legs • Have tissues, organs, and organ systems • Bilateral symmetry • Head and tail end

  12. Worms • Do worms have a brain? • Yes • Simplest organism with a brain • Knot of nerve tissue located in the head end • Detect food, mates, and predators quickly • Responds to the information from the brain

  13. Reproduction • How do worms reproduce? • Sexually • Male and female worms = sexually • Have both sex organs – 2 worms mate and exchange sperm • Break into pieces – asexually • Earthworms can’t do this • Regeneration : • Ability to regrow body parts

  14. Flatworms • Flat bodies • Examples: • Planarians • Flukes • Tapeworms • Bodies soft like jelly • Almost too small to be seen except tapeworms can grow to 12 meters

  15. Flatworms • Most are parasites that obtain food from their hosts • Parasite: • Organism that lives inside or on another organism • Host: • The organism that a parasite lives on or in • The parasite takes nutrients from the host

  16. Tapeworms • 1 kind of parasitic flatworm • Absorbs food from the host’s digestive system • Most live in more than 1 host during their lifetime

  17. Planarian • Nonparasitic flatworm • Glide over rocks, damp soil, and swim slowly through oceans • Scavengers: • Feed on dead or decaying material

  18. Planarian • They also are predators towards animals smaller than they are • Have eyespots • Function sort of like eyes but can not see specific images • Head has cells to pick up odors • Use smell to locate food

  19. Planarian • Feeds like a vacuum cleaner • Inserts a feeding tube into its food • Sucks up partly digested food • Distributed to body cells by diffusion • Only have 1 opening • Undigested food leaves through the feeding tube

  20. Roundworms • Million roundworms live in each square meter of sand • Live in moist environment • Tiny and hard to see • May be the most abundant animal on Earth

  21. Roundworms • Cylindrical body • Tiny strands of spaghetti • Can be carnivores, herbivores, or parasites • Hookworms are a roundworm parasite

  22. Hookworm http://www.foxvalleyvet.net/wordpress/wp-content/uploads/2011/09/hookworm2.jpg

  23. Roundworms • Have a digestive system that is open at both ends • Waste exits through the anus • Having a one-way digestive system allows the worm to use its food efficiently and absorb more nutrients

  24. Segmented Worms • You can find them in your own backyard • Leeches are parasitic segmented worms • More closely related to crabs and snails http://news.discovery.com/human/2010/11/12/leech-278x225.jpg

  25. Segmented Worms • Occupy nearly all environments • Use burrows to hide from predators • Sit-and-wait predators

  26. Segmentation • Bodies are made up on many linked sections called ___________ • Segments • Earthworms usually have more than 100 segments • Some organs are repeated in most segments

  27. Segmentation • Ex: • Each segment has tubes that remove wastes • Reproductive organs are found in only certain segments • Nerve cords and the digestive tube run the whole length of the body • 1 way digestive tract which means they have an anus

  28. Closed Circulatory System • Blood moves only within a connected network of tubes called blood vessels • In an open system the blood leaves the circulatory system and sloshes inside the body • A closed system can move the blood faster

  29. Closed Circulatory System • If you have a closed system you can be larger and more active • Blood carries oxygen and food to cells http://www.infusion.allconet.org/webquest/img010.jpg

  30. Earthworms • Earthworms scavenge for • Dead and decaying plant and animal remains in the soil • When it is damp they come out of their burrows • They only come out when it is damp because their skin can’t dry out

  31. Earthworms • They mainly come out at night because they are safer from predators • Obtain oxygen through the moisture on their skin • Bristles on the segments help the worms move

  32. Earthworms • Benefit us: • Make the soil more fertile with their droppings • Loosen soil when they tunnel • Allow air, water, and roots to move through the soil when they tunnel

More Related