1. Hydra
Lesson 17 Notes

3. I. Basics
Freshwater organism
Multicellular
Tubular

4. Hydra Swimming

5. 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 layers

8. IV. Reproduction Warm weather: budding (asexual)
Cold weather (fall): sexually; drop eggs which hatch in the water
Dioecious: production of male or female parts

9. Hydra Budding

10. 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 mouth

11. Hydra catches Daphnia

12. Hydra eating Sea Monkey

13. To label…. Mouth All questions page 159 Tentacles Body
Basal disc
Bud
All questions page 159
All questions page 161