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13 Cards in this Set
- Front
- Back
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what are Cnidarians characterized for? |
having nematocysts |
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what are nematocysts? |
stinging cells on the tentacles |
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members include....? |
~jelly fish ~sea anemone ~Portuguese man-of-war ~coral |
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body structure |
-Radial symmetry ~single mouth opening ~nerve net ~usually only 2 cell layers in thickness ~nematocysts |
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single mouth opening description |
food goes in and waste goes out all at the same place |
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what is a nerve net? |
a simple nervous system |
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what is in between the cell layers? |
jelly-like material called mesoglea |
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what do nematocysts do? |
protect and obtain food for the organism |
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how do Cnidarians reproduce? |
All can reproduce sexually and asexually |
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what is the sexual form? |
mesuda |
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what is the asexual form? |
polyp (usually budding) |
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how do they get nutrition? |
nematocysts sting their prey which immobilizes the prey. the prey is therefore pulled into the opening for the mouth. digestive enzymes are released into the gastrovascular cavity and nutrients are absorbed directly into the cells |
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habitat? |
mostly marine but some are freshwater like hydra |
