Sec 1.3. =2013&area=view&x=10&y=10.
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Transcript of Sec 1.3. =2013&area=view&x=10&y=10.
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Sec 1.3
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http://phschool.com/webcodes10/index.cfm?wcprefix=cep&wcsuffix=2013&area=view&x=10&y=10
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Cnidarians
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Body Structure-radial symmetry, -a central hollow cavity, -and tentacles containing stinging cells
- Polyp:
-Vase shaped body plan - Opens at the top tentacles spread out from
mouth - adapted to life attached to underwater surface - Medusa:
-Bowl shaped body plan (ex. Jellyfish ) - Mouth opened downward and tentacles trail
down - adapted for swimming life - Some Cnidarians go through both a polyp and medusa
stages during their lives.
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Obtaining food
-Cnidarians use stinging cells to catch the prey they eat
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Movement
-Unlike sponges, Cnidarians can move to escape danger or obtain food.
-Some have muscle –like tissue that allow movement in different ways
-Movement directed by nerve cells
Jelly fish: swim
Hydra: somersaults
Sea Anemones can shrink down
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Reproduction
-Reproduce Sexually and asexually
-For Polyps budding is most common form of asexual reproduction.
-Sexual reproduction varies: both sexes within one individual or separate individuals.
-Moon Jelly life cycle
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Life in a colony
-Some species of cnidarians live in a colony
-Colony: a group of many individual organisms.
-Stony corals : coral reefs
-Portuguese man of war-a colony can be so tight that it acts like a
single animal.
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