1. Discussion Questions
  2/17/15
Using your textbook, journal, handouts, or smart phone please
complete the following:
1. Please compare and contrast Phylum Porifera and
Phylum Cnidaria

3. Reminders Animal Exam 3-11-15 Root word quiz 3-10-15
Phyla Books due the day of the test
Zoo Trip
Go to room 1135 Tues or Thurs for Science Peer Tutoring during PLC

4. QUIZ Clear your desks of everything Do NOT write on the quiz please
QUIZ
Clear your desks of everything
Do NOT write on the quiz please
Use CAPITAL letters please
Keep your answers covered
If you need to make up a quiz due to an absence… come see me Tues or Thurs during PLC
Flip it over when you are finished and hang on to it.

5. Today’s Objective:
OBJECTIVES: Describe and Explain the characteristics of Phyla Porifera and Phylum Cnidaria

7. Phylum Porifera
“Sponges”

8. Osculum – water leaves through this hole at the top of the sponge
Choanocyte
Mesenchyme
Epidermis
Amoebocyte
Pore
Spicule
Central Cavity
Choanocytes – cells that use a flagellum to move a steady current of water through the sponge; also trap food & begin digestion process
Osculum – water leaves through this hole at
the top of the sponge
Amoebocytes – cells that complete digestion of food particles & transfer nutrients throughout the sponge; also help make spicules
Mesenchyme – jelly like middle layer where
amoebocytes pick up nutrients
Spicule – spike-shaped structure that makes up the skeletons of harder sponges; made of either chalklike calcium carbonate of glasslike silica

9. Porifera – General Characteristics
Multicellular
Heterotrophic – filter feeder
Lack symmetry
Matrix – mass of cells

10. Feeding Method
Brought in by choanocytes (collar cells) & digestion begins intracellular (inside cell)
Choanocytes release nutrients into mesenchyme
Amoebocytes pick up nutrients, complete digestion, deliver nutrients to the sponge, & pick up wastes
Waste removed by pores

11. Reproduction Asexual – budding
Gemmules – group of amoebocytes surrounded by a protective layer; these form when environmental conditions are harsh
Sexual – can produce egg and sperm, but CANNOT self fertilize

12. Habitat
Live attached to sea floor (sessile)

13. Ecology
Some photosynthetic
Provide habitats for other marine animals

14. Phylum Cnidaria

15. Cnideria - Structures/Functions
Tentacles - arm-like structures around
mouth, armed with
cnidocytes
Medusa - motile (free-swimming)
cnidarian with mouth down
Basal Disc - used to attach a polyp to
rock or water plant
Polyp - sessile cnidarian with mouth up
Epidermis – outer layer of body wall
Mesoglea – jelly like layer between
inner & outer layers of body
Gastrovascular Cavity - interior of
hollow body
Gastrodermis – inner layer of body wall
Epidermis
Tentacles
Mesoglea
G. Cavity
Mouth
Mouth
G. Cavity
Tentacles
Epidermiss
Gastrodermis
Gastrodermis
Basal Disk
Polyp
Medusa

16. Cnideria - Structures/Functions
Cnidocyte - stinging cell; used to stun/ paralyze prey
Nematocyst – small barbed stinging structure to capture prey

17. Tissues – network of nerve cells Acoelomate
Cnideria – General Characteristics
Multicellular
Radial symmetry
Tissues – network of nerve cells
Acoelomate

18. Cnideria – Feeding Method
Tentacle with cnidocytes paralyze prey
Tentacles move food into mouth then into gastrovascular cavity 

19. Enzymes digest the food Cells engulf digested food
Cnideria – General Characteristics
Enzymes digest the food
Cells engulf digested food
Undigested food passes out through mouth

20. Asexual – budding or regeneration Sexual
Cnideria – Reproduction
Asexual – budding or regeneration
Sexual
Hermaphroditic - produce both egg & sperm, but CANNOT self fertilize

21. Cnideria – Habitat & Ecology
Most marine; few fresh water
Ecology
Balance the amount of smaller living things living in water
Provide cleaner water
Help create coral reefs & biodiversity

22. Power Point Analysis for Animals
New Groups
Work on the animal handouts you picked up at the door today and those from Fri. Work on your Animal Phyla Booklet (booklet will not go in your journal)….everything else will as usual. 22