Transcript WORMSx

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3 Major types of worms:
› Flatworms
› Roundworms
› Segmented Worms
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3 Major Phyla:
› Platyhelmenthes
› Nematoda
› Annelida
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All worms are invertebrates
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Long, narrow bodies
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No legs
Worms have a brain
 Brain and sense organs are found in the
head end
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Worms can reproduce sexually and
asexually
› How can they reproduce asexually?
› What is regeneration?
Soft bodies
 Most flatworms are parasites
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› What is a parasite?
Tapeworms live in intestines of other
animals
 Can grow to 10 to 12 meters long
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Planarians are scavengers
 Planarians also have eyespots
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› What is a scavenger?
› What are eyespots?
› How do planarians digest food?
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How many roundworms can live in a
square meter of sand?
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How do roundworms get food?
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Roundworms have a digestive system
that is a tube at both ends
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What type of symmetry do worms have?
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What are the 3 types of worms?
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What are the 3 phyla of worms?
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How do worms reproduce?
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Define regeneration.
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What is a tapeworm and how does it get food?
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How do planarians ‘see’?
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How do roundworms get energy?
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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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Found in most environments
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Live in burrows or tubes
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Many are predators
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These worms are made up of linked
segments
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Earthworm usually has over 100 segments
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Every section has tubes that remove
wastes
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Nerves and a digestive tube run the
length of the body
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Reproductive organs are only in some
sections, not all
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Segmented worms have a closed
circulatory system
› What might this mean?
› What else has a closed circulatory system?
In segments 9 through 13, the worm has
“hearts” to pump blood
 These pump blood through the body
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Earthworms are scavengers
 They come to the surface at night
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› Why?
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Bristles help the worm move
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Mouth –
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Crop –
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Gizzard –
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Intestines -
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Brain –
Ventral Nerve Cord –
 Dorsal Nerve Cord 
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Hearts –
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Blood Vessels
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Bristles –
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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