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3/24/14 Mr. Faia 6th Grade Science
WORMS 3/24/14 Mr. Faia 6th Grade Science
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What Worms Have in Common
3 Major types of worms: Flatworms Roundworms Segmented Worms
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What Worms Have in Common
3 Major Phyla: Platyhelmenthes Nematoda Annelida
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What Worms Have in Common
All worms are invertebrates Long, narrow bodies No legs
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What Worms Have in Common
Worms have a brain Brain and sense organs are found in the head end
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What Worms Have in Common
Worms can reproduce sexually and asexually How can they reproduce asexually? What is regeneration?
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Flatworms Soft bodies Most flatworms are parasites What is a parasite?
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Flatworms Tapeworms live in intestines of other animals
Can grow to 10 to 12 meters long
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Flatworms Planarians are scavengers Planarians also have eyespots
What is a scavenger? What are eyespots? How do planarians digest food?
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Roundworms How many roundworms can live in a square meter of sand?
How do roundworms get food?
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Roundworms Roundworms have a digestive system that is a tube at both ends
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REVIEW!!! What type of symmetry do worms have?
What are the 3 types of worms? What are the 3 phyla of worms? How do worms reproduce? Define regeneration. What is a tapeworm and how does it get food? How do planarians ‘see’? How do roundworms get energy?
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Roundworms 1-way digestive systems are like an assembly line
Each part of the process happens at a different stop This allows the animal to absorb more nutrients
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Segmented Worms Found in most environments Live in burrows or tubes
Many are predators
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Segmented Worms These worms are made up of linked segments
Earthworm usually has over 100 segments
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Segmented Worms Every section has tubes that remove wastes
Nerves and a digestive tube run the length of the body Reproductive organs are only in some sections, not all
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Segmented Worms Segmented worms have a closed circulatory system
What might this mean? What else has a closed circulatory system?
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Segmented Worms In segments 9 through 13, the worm has “hearts” to pump blood These pump blood through the body
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Segmented Worms Earthworms are scavengers
They come to the surface at night Why? Bristles help the worm move
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Segmented Worms
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Earthworms Mouth – Crop – Gizzard – Intestines -
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Earthworms Brain – Ventral Nerve Cord – Dorsal Nerve Cord -
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Earthworms Hearts – Blood Vessels
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Earthworms Bristles –
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REVIEW Part 2!!! List the 3 major phyla of worms?
How does a tapeworm obtain food? Describe an earthworms body. What kind of circulatory system does an earthworm have? Which segments are the earthworms “hearts” found? What digests dirt in an earthworm?
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