D escribe the main characteristics of cnidarians E xplain why coral reefs are important Warm up What makes up a coral reef Homework Finish all questions on packet pages 6 7 8 amp 9 ID: 797330
Download The PPT/PDF document "MONDAY 2/29/16 Learning Goal:" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
MONDAY 2/29/16
Learning Goal:
D
escribe
the main characteristics of cnidarians
E
xplain
why coral reefs are
important
Warm up:
What makes up a coral reef?
Homework:
Finish all questions on packet pages 6, 7, 8, & 9
TEST on Wednesday on Ch. 9 Sec 1 & 3
Slide2Cnidarians
Chapter 9 Section3
Slide3Cnidarians
Jellyfish, corals, and sea anemones
Invertebrates
that have
stinging cells
to capture food and protect themselvesTake food into central body cavity
Slide4Cnidarians: Body Structure
Two
different body plans (vase and bowl)
Radial
symmetry
Central hollow
cavityTentacles containing stinging cells
Slide5Radial symmetry -
symmetry around a central axis, as in a starfish
Slide6Slide7Body Structure:
Polyp
Vase-shaped
body plan is a
POLYP
Sea anemone
Mouth opens at topTentacles spread out from around mouthMost are attached to underwater surface
Slide8Body Structure:
Medusa
Bowl-shaped body plan is a
MEDUSA
Jellyfish
Adapted for a
swimming lifeMouths open downward and tentacles trail down
Slide9Obtaining Food
Use
stinging cells
to catch animals they eat (prey)
Contains threadlike structure with
spines
Uses tentacles to pull prey to mouthTakes food into central body cavity Expels undigested food through mouth
Slide10Movement
Unlike adult sponges, many cnidarians move to escape danger and to obtain food
Jellyfish
Swim through the water
Hy
dras turn slow somersaults
Sea AnemonesStretch out, shrinkdown, bend slowly from side to side
Slide11Reproduction
Asexual Reproduction
Hydras, corals, and sea anemones
Sexual Reproduction
Jellyfish
Slide12Life in a Colony
Colony
a group of many individual animals
Stony corals and Portuguese man-of-war
Slide13Stony Coral
a coral reef is built by cnidarians
c
oral reefs are home to more species of fishes and invertebrates than any other environment on Earth
Coral polyps produce hard,
stony skeletons around their soft bodies
Slide14Portuguese Man-of-War
Contains as many as
1,000 individuals
that function together as
one unit
Top: gas filled chamber, allows colony to floatBottom:
polyps with different functions drift belowSome catch prey and help with digestion and reproduction
Slide15