Download Dec11

Biology 3rd Block Room 128
Mr. R. Bair Biology Teacher
Mrs. MV Smith Resource Teacher
Date: December 11, 2007
Drill
1. Why is it helpful for plants to create fruit?
Fruits attract seed
Seed distributed
Seeds dropped in pile of fertilizer
2. What do plants use to attract pollinators?
Petals, smell, nector
Sponges
 Poifera
 Sea Sponges
 Asymetric
 Sessile (don’t do anything)
 No true tissue
 Filter feed
 9,000 species
Sponges have an asymmetric body with no true tissues, or organs. They have two layers of cells. Flattened cells cover the exterior.
Collar cells line the interior chambers. Collar cells move large volumes of water through body pores by their beating flagella. They
also trap suspended food particles in their microvilli collars.
This animation (Audio - Important) describes sponges.
Between the two layers of cells there is a semifluid matrix with needlelike structures for support.
Sponges reproduce sexually and have a free-living larval stage. They also reproduce asexually by fragmentation or gemmules.
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http://trc.ucdavis.edu/biosci10v/bis10v/week9/07sponges.html
Cnidera
 Jellies
 Some Sessile (Polyp)
 Some Nectons (float) Medusa
Cnidarians are tentacled, radial animals. This group includes jellyfishes (Scyphozoa), sea anemones (Anthozoa), and Hydra
(Hydrozoa).
The phylum name comes from their ability to sting by discharging nematocysts.
This animation (Audio - Important) illustrates the function of a nematocyst.
The cnidarian body is not complex. There are two main body plans , the medusa and the polyp. The medusa resembles an umbrella
and floats like a tentacle-fringed bell in the water. The polyp is tubelike and is usually attached to some substrate. It may be solitary
or part of a colony.
The digestive cavity is saclike (only a mouth) and can accommodate prey larger than the cnidarian itself. True tissues include an
outer epidermis and an inner gastrodermis (epithelial layers with a jellylike mesoglea between). There is a nerve net that
coordinates sensory and motor activities.
Biology 3rd Block Room 128
Mr. R. Bair Biology Teacher
Mrs. MV Smith Resource Teacher
Cnidarian life cycles show alternation of life stages. Reproduction may be sexual, with a planula larva stage, or it may be asexual.
Gonads may be in the epidermis or gastrodermis.
http://trc.ucdavis.edu/biosci10v/bis10v/week9/07cnidaria.html
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Ex
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o Man of War
o Anemones
o Jelly Fish
Radial Symmetry
Primitive Stomach/Circulatory System
Stinging Cells-Nematocysts
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http://trc.ucdavis.edu/biosci10v/bis10v/week9/cnidaria.gif
Phtyhelminthes
 Flat Worms
 Bilateral Symmetric
 Acoelomate
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saclike gut (but none in tapeworms),
bilateral symmetry,
cephalization and
Acoelomate (no coelom).
Simple two way digestion
 Many species are hermaphrodites
Examples:lukes (parasites)
Tapeworms
Phylum
Body
type/Symmetry
Examples
(both sexes in one body) but practice cross-fertilization.
Characterics
Pictures
Biology 3rd Block Room 128
Mr. R. Bair Biology Teacher
Mrs. MV Smith Resource Teacher
Sessile=don’t move
Porous bodies
Spucules-make up
skeleton of sponge
Filter feders
Porifera
Aceolemate
___________
Radial
symmetrial or
asymmetrical
sponges
Cnideria
Aceolemate
___________
Radial
symmetry
Jelly fish,
Hydra
Sea anemane,
coral
Carnivores
Cnidocytes=
stinging cells
Polyp-sessile form.
Medusa=actual
jellyfish
Platyhelminthes
Aceolemate
Bilateral
Flatworm
Tapeworm
Fluke
Parasitic, scolex,
mouth opening
One digestive tract
opening
Asexual
reproduction
Nerve Cord
Mouth/Anus same
Cross Fertilization
Nematoda
Pseudocelomate
Radial
symmetrial
Roundworms
Hookworms
Trichinella
(pork)
Active hunters
Found in soil
Parasitic
Stylet= needle like
mouth
Exoskeleton
Central ganglion
Nerve cord
Most male/female
parts
Complete digestive
tude Moist skin acts
as “lungs”
Phylum
Body
type/Symmetry
Coelomate
__________
Bilateral or
Radial
Examples
Characterics
Earthworm
Leeches
Sandworms
Segmented
worms
Septa= segments
Hermaphroditichave both sex
organs
Annelidia
Pictures
Biology 3rd Block Room 128
Mr. R. Bair Biology Teacher
Mrs. MV Smith Resource Teacher
Molluska
Coelomate
__________
Bilateral
Snails
Squid
Clams
Scallops
Slugs
Octopus
Almost all have
shells
3 parts
foot
head
viseral mass
some have shells
Gastropods_ snails,
slugs
Bivalves-clams, or
oysters
Cephalopodssquid/octopus
Echinodermata
Coelomate
__________
Bilateral
Star fish
Sea urchin
Sea cumber
Arthropoda
Coelomate
__________
Bilateral
Bugs/insects
Shrimp
Spiders
Crabs
Lobsters
Endoskeleton
Carnivores
Pentaradial
symemtry-5 arms
symmetry
Exoskeleton
First winged
organism
Acarchnids-spiders
Crustaceans- crabsm
lobsters
Uniramia=insects,
largest group
Molluska
 Examples
o
 Gastropods snails, slugs
 Bivalves- clams, oysters, muscles, scallops
 Cephalopods-octopus, squids
Passes a mantle
 Outgoing which produces the shell
 Works for respiration
Biology 3rd Block Room 128
Mr. R. Bair Biology Teacher
Mrs. MV Smith Resource Teacher
o
Radula
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