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30 Cards in this Set
- Front
- Back
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Three major phyla of worms |
Platyhelminthes, Nematoda, Annelida |
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Platyhelminthes |
flatworms |
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Nematoda |
roundworms |
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Annelida |
segmented worms |
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Which of the 3 groups of worms is the most numerous |
roundworms |
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General Characteristics of Worms |
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Nervous system |
simplest organs with brain sense organs in head end - responds quicker sensitive to light, touch, vibrations |
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reproduction |
sexual (male sperm & female egg) asexual (fragmentation - break into pieces/regeneration) |
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Flatworms Description |
flat, soft, jellylike |
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3 types of flatworms |
planarians, tapeworms, flukes |
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parasites |
organism that lives on in inside another organism |
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hosts |
organism a parasite lives on |
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free-living organism |
does not need to live on or in another organism |
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Planarians Description |
small, black or brown, eyespots, scavenger, free living |
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Planarian feeding |
feeds like a vacuum cleaner inserts feeding tube into food, release digestive juices, sucks food back into body to finish digestion |
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Planarian reproduction |
asexual by fragmentation |
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Tapeworms General Description |
flatworm, body adapted for absorbing food, sucker & hooks on head parasitic |
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Flukes General Description |
oval shape, 1 cm long, all parasitic, have suckers |
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Fluke Eating |
use suckers to attach to host, suck blood & body fluids |
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Roundworms General Description |
cylindrical body, pointed at both ends, small, hard to see, live in any moist environment |
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Examples of Roundworms |
Ascaris, Hookworm, Pinworm |
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Roundworm Digestion |
1 way digestive system, 2 openings (mouth & anus) digestion happens in stages |
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Segmented Worms Description |
series of rings separated by grooves (segments) |
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Examples of Segmented Worms |
Earthworm, leeches, sandworms |
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Segmented Worms Circulatory System |
closed system blood can move quicker around the animal |
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Impact worms have on the environment/other organisms |
earthworm holes allow air into soil earthworm waste (castings) fertilize soil worms help decompose & recycle nutrients some (roundworms, flatworms) cause diseases |
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Where do worms live |
moist environments earthworms & roundworms in soil leeches in water marine worms in ocean |
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Worm bodies & symmetry |
tube-shaped, soft bodies, bilateral symmetry |
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how do worms get oxygen |
diffusion through their skin take in oxygen, dissolve in water, through their skin |
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Body systems that worms have |
Digestive system Excretory system (waste disposal) Muscular system Nervous system Circulatory system |
