Discussion QuestionsDiscussion Questions

1. Please compare and contrast Phylum Porifera and 1. Please compare and contrast Phylum Porifera and Phylum CnidariaPhylum Cnidaria

 

  2/17/15

 

Using your textbook, journal, handouts, or smart phone please complete the following:

RemindersAnimal Exam 3-11-15Root word quiz 3-10-15Phyla Books due the day of the test - 3-11-15Zoo Trip 3-4-15Go to room 1135 Tues or Thurs for Science Peer Tutoring during PLC

QUIZ

Clear your desks of everything Do NOT write on the quiz pleaseUse CAPITAL letters pleaseKeep your answers coveredIf you need to make up a quiz due to an absence… come see me Tues or Thurs during PLCFlip it over when you are finished and hang on to it.

 

 

Today’s Objective:

OBJECTIVES: Describe and Explain the characteristics of Phyla Porifera and Phylum Cnidaria

Phylum Porifera“Sponges”

Osculum

ChoanocyteMesenchymeEpidermis

AmoebocytePore

Spicule

Central Cavity

Osculum – water leaves through this hole at

the top of the sponge

Choanocytes – cells that use a flagellum to move a steady current of water through the sponge; also trap food & begin digestion processMesenchyme – jelly like middle layer where

amoebocytes pick up nutrients

Amoebocytes – cells that complete digestion of food particles & transfer nutrients throughout the sponge; also help make spiculesSpicule – spike-shaped structure that makes up the skeletons of harder sponges; made of either chalklike calcium carbonate of glasslike silica

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

Feeding Method1. Brought in by choanocytes (collar

cells) & digestion begins intracellular (inside cell)

2. Choanocytes release nutrients into mesenchyme

3. Amoebocytes pick up nutrients, complete digestion, deliver nutrients to the sponge, & pick up wastes

4. Waste removed by pores

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

http://www.youtube.com/watch?v=mVavqt4Sbyo

Habitat Live attached to sea floor (sessile)

Ecology Some photosynthetic Provide habitats for other marine animals

Phylum Cnidaria

Tentacles

Tentacles

Mouth G. Cavity

Epidermiss Gastrodermis

Basal Disk

Gastrodermis

MesogleaG. Cavity

Epidermis

Cnideria - Structures/Functions

MedusaPolyp

Mouth

Polyp - sessile cnidarian with mouth upBasal Disc - used to attach a polyp to

rock or water plant

Medusa - motile (free-swimming)

cnidarian with mouth down

Epidermis – outer layer of body wallMesoglea – jelly like layer between

inner & outer layers of body

Gastrodermis – inner layer of body wallGastrovascular Cavity - interior of

hollow body

Tentacles - arm-like structures around

mouth, armed with

cnidocytes

Cnidocyte - stinging cell; used to stun/ paralyze prey

Nematocyst – small barbed stinging structure to capture prey

Cnideria - Structures/Functions

Multicellular Radial symmetry Tissues – network of nerve cells Acoelomate

Cnideria – General Characteristics

Tentacle with cnidocytes paralyze prey

Tentacles move food into mouth then into gastrovascular cavity

Cnideria – Feeding Method

Enzymes digest the food

Cells engulf digested food

Undigested food passes out through mouth

Cnideria – General Characteristics

Asexual – budding or regeneration

Sexual Hermaphroditic - produce both egg & sperm,

but CANNOT self fertilize

Cnideria – Reproduction

Habitat Most marine; few fresh water

Ecology Balance the amount of smaller living things living in water

Provide cleaner water

Help create coral reefs & biodiversity

Cnideria – Habitat & Ecology

Power Point Analysisfor 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.