Lesson 17 Notes I Basics Freshwater organism Multicellular Tubular Hydra Swimming http wwwyoutubecom watchfeature playerdetailpageampv 9MEt0Ot7Pkc II Structures 6 tentacles around mouth ID: 544528
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Slide1
Hydra
Lesson 17 NotesSlide2Slide3
I. Basics
Freshwater organism
Multicellular
TubularSlide4
Hydra Swimming
http://
www.youtube.com
/
watch?feature
=
player_detailpage&v
=9MEt0Ot7PkcSlide5
II. Structures
6 tentacles around mouth
Basal disc opposite mouth used to attach to surfaces/organisms
2 layers
Inner –
gastrodermis
Outer – epidermis
Mesoglea
–
jelly-like substance
between inner and outer layersSlide6Slide7Slide8
IV. Reproduction
Warm
weather: budding (asexual)
Cold
weather (fall): sexually; drop eggs which hatch in the water
Dioecious
: production of male or female partsSlide9
Hydra Budding
http://
www.dnatube.com
/video/11330/Reproduction-Of-HydraSlide10
III. Feeding
Nematocysts
: stinging structures on tentacles
Release poisonous toxin
Tentacles draw food into mouth
Digestive enzymes in tube break down food in liquid
Nutrients taken in by
diffusion
Wastes leave via mouthSlide11
Hydra catches Daphnia
http://
www.youtube.com
/
watch?feature
=
player_detailpage&v
=Kukv0AtIVdUSlide12
Hydra eating Sea Monkey
http://
www.dnatube.com
/video/1440/Hydra-and-sea-monkey-1Slide13
To label….
Mouth
Tentacles
Body
Basal disc
Bud
All
questions page 159
All questions page 161