Homework from last class: <ul><li>Complete Section Review 26-2 questions 1-3 (p. 563) </li></ul><ul><li>Fill in and colour...
Sponge quiz <ul><li>You have 10 minutes to write the quiz. </li></ul><ul><li>Good luck! </li></ul>
Section Review 26-2 (p. 563): <ul><li>How do sponges differ from other animals? How do they feed, respire, and eliminate w...
Section Review 26-2 (p. 563): <ul><li>2)   How are sponges providing useful to medical science? </li></ul><ul><li>Sponges ...
Section Review 26-2 (p. 563): <ul><li>3) Why are sponges thought to be an evolutionary dead end? </li></ul>No other groups...
Warm-up: The Box Jellyfish <ul><li>http://www.youtube.com/watch?v=hUTr0ufJGgo </li></ul>
Phylum Cnidaria:  Jellyfish, Sea Anemones, and Corals Chapter 26: Sponges, Cnidarians, and Unsegmented Worms pp. 564-569
 
Introduction to Cnidarians <ul><li>Soft-bodied animals </li></ul><ul><li>Radially symmetrical </li></ul><ul><li>Body has  ...
<ul><li>Medusa </li></ul><ul><li>free-floating </li></ul><ul><li>motile </li></ul><ul><li>Polyp </li></ul><ul><li>a ttache...
Both forms have a  gastrovascular cavity  with only one opening     food enters the same hole that wastes go out! (a two-...
Classes of Cnidarians <ul><li>Class Hydrozoa </li></ul><ul><ul><li>Mostly polyps ; short medusa stage </li></ul></ul><ul><...
Classes of Cnidarians <ul><ul><ul><li>3)  Class Anthozoa (sea anemones and corals)  </li></ul></ul></ul><ul><ul><ul><ul><u...
Form and Function of Cnidarians <ul><ul><ul><li>Digestive system:  </li></ul></ul></ul><ul><ul><ul><li>Gastrovascular cavi...
Form and Function of Cnidarians <ul><ul><ul><li>Respiratory system: </li></ul></ul></ul><ul><ul><ul><li>Circulatory system...
Form and Function of Cnidarians
Obelia life cycle
Life cycle of a Cnidarian
Ecology of Cnidarians <ul><ul><ul><li>Sea anemones and small fish are symbiotic </li></ul></ul></ul><ul><ul><ul><li>Coral ...
Fertig! Activity:  Sponge and Cnidaria Crossword puzzle Cnidaria colouring worksheet
Activity: <ul><li>Work on the Sponge and Cnidaria Crossword Puzzle – vocabulary review from the last 2 classes </li></ul><...
Homework for next class: <ul><li>Complete Section Review 26-3 questions 1-5 (p. 569) </li></ul><ul><li>Complete Cnidaria c...
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Biol 11 Lesson 3 Feb 7 - Ch. 26 Cnidarians

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Biology 11
Animal Biology unit - Invertebrates
Miller, K.R. & Levine, J. (2000). Biology (5th ed.). New Jersey: Prentice Hall.
Ch. 26: Sponges, Cnidarians, and Unsegmented Worms
pp. 564-569.

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Biol 11 Lesson 3 Feb 7 - Ch. 26 Cnidarians

  1. 1. Homework from last class: <ul><li>Complete Section Review 26-2 questions 1-3 (p. 563) </li></ul><ul><li>Fill in and colour the sponge diagram worksheet </li></ul><ul><li>Read over class notes and check out the class blog: </li></ul><ul><li>http://msoonscience.blogspot.com/ </li></ul><ul><li>Study for Quiz on Phylum Porifera next class! </li></ul><ul><li>Return Field Trip form by Feb. 7 – Vancouver Aquarium! </li></ul><ul><li>Bring pencil crayons to class for all the colouring ahead!  </li></ul>
  2. 2. Sponge quiz <ul><li>You have 10 minutes to write the quiz. </li></ul><ul><li>Good luck! </li></ul>
  3. 3. Section Review 26-2 (p. 563): <ul><li>How do sponges differ from other animals? How do they feed, respire, and eliminate wastes? </li></ul><ul><li>Sponges: </li></ul><ul><ul><li>do not have a mouth or digestive tract (gut) </li></ul></ul><ul><ul><li>no true tissue layers (endoderm, ectoderm, mesoderm) or organ systems </li></ul></ul><ul><li>Feed: Collar cells catch food particles and engulf them; amoebocytes take food particles from the collar cells and carry them to other parts of the sponge. </li></ul><ul><li>Respiration and excretion: The current of H 2 O that flows through the body of a sponge delivers O 2 to the cells and removes CO 2 and cellular wastes. </li></ul>
  4. 4. Section Review 26-2 (p. 563): <ul><li>2) How are sponges providing useful to medical science? </li></ul><ul><li>Sponges produce chemicals that can be used to fight bacteria, viruses, and other disease-causing microorganisms. </li></ul>
  5. 5. Section Review 26-2 (p. 563): <ul><li>3) Why are sponges thought to be an evolutionary dead end? </li></ul>No other groups of organisms have evolved from sponges.
  6. 6. Warm-up: The Box Jellyfish <ul><li>http://www.youtube.com/watch?v=hUTr0ufJGgo </li></ul>
  7. 7. Phylum Cnidaria: Jellyfish, Sea Anemones, and Corals Chapter 26: Sponges, Cnidarians, and Unsegmented Worms pp. 564-569
  8. 9. Introduction to Cnidarians <ul><li>Soft-bodied animals </li></ul><ul><li>Radially symmetrical </li></ul><ul><li>Body has 2 cell layers (ectoderm and endoderm) separated by a layer of jellylike (mesoglea) </li></ul><ul><li>Have stinging tentacles arranged in a circle around mouth </li></ul><ul><li>Most have life cycles that include 2 stages : </li></ul><ul><ul><li>Polyp </li></ul></ul><ul><ul><li>Medusa </li></ul></ul>gastrovascular cavity endoderm mesoglea ectoderm
  9. 10. <ul><li>Medusa </li></ul><ul><li>free-floating </li></ul><ul><li>motile </li></ul><ul><li>Polyp </li></ul><ul><li>a ttached </li></ul><ul><li>sessile </li></ul>
  10. 11. Both forms have a gastrovascular cavity with only one opening  food enters the same hole that wastes go out! (a two-way digestive system)
  11. 12. Classes of Cnidarians <ul><li>Class Hydrozoa </li></ul><ul><ul><li>Mostly polyps ; short medusa stage </li></ul></ul><ul><ul><li>Often live in colonies , where specialized polyps perform particular functions </li></ul></ul><ul><ul><li>Example members: hydras (small, freshwater), Portuguese man-of-war (huge, marine; colonial) </li></ul></ul><ul><ul><ul><li>2) Class Scyphozoa (jellyfish) </li></ul></ul></ul><ul><ul><li>Medusa is dominant stage ; </li></ul></ul><ul><ul><li>very short polyp stage </li></ul></ul>
  12. 13. Classes of Cnidarians <ul><ul><ul><li>3) Class Anthozoa (sea anemones and corals) </li></ul></ul></ul><ul><ul><ul><ul><ul><li>Polyps only , no medusa stage </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Corals create protective “cups”; anemones don’t </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Some corals are reef building and are ecologically important </li></ul></ul></ul></ul></ul>
  13. 14. Form and Function of Cnidarians <ul><ul><ul><li>Digestive system: </li></ul></ul></ul><ul><ul><ul><li>Gastrovascular cavity is where food is broken down </li></ul></ul></ul><ul><ul><ul><li>Food is absorbed and further digested by the cells that line the gastrovascular cavity (gastroderm (endoderm) cells) </li></ul></ul></ul><ul><ul><ul><li>Cnidoblast cells (in tentacles) contain nematocysts  poison darts that spring out when touched and paralyze prey </li></ul></ul></ul><ul><ul><ul><ul><li>Tentacles then pull food into mouth </li></ul></ul></ul></ul>
  14. 15. Form and Function of Cnidarians <ul><ul><ul><li>Respiratory system: </li></ul></ul></ul><ul><ul><ul><li>Circulatory system: </li></ul></ul></ul><ul><ul><ul><li>Excretory system: </li></ul></ul></ul><ul><ul><ul><li>O 2 , CO 2 , and wastes get in and out of cells by diffusion through gastrovascular cavity and epidermis (ectoderm) . </li></ul></ul></ul><ul><ul><ul><li>Direct exchange with surrounding water. </li></ul></ul></ul><ul><li>No organized systems for any of these </li></ul><ul><li>No need since cnidarians are only a few layers thick </li></ul>for metabolic waste
  15. 16. Form and Function of Cnidarians
  16. 17. Obelia life cycle
  17. 18. Life cycle of a Cnidarian
  18. 19. Ecology of Cnidarians <ul><ul><ul><li>Sea anemones and small fish are symbiotic </li></ul></ul></ul><ul><ul><ul><li>Coral reefs are a major habitat for many organisms They also protect the land from erosion </li></ul></ul></ul><ul><ul><ul><ul><li>Coral reefs are very sensitive to pollution! </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Some cnidarians are used in medical research (toxins) </li></ul></ul></ul></ul>
  19. 20. Fertig! Activity: Sponge and Cnidaria Crossword puzzle Cnidaria colouring worksheet
  20. 21. Activity: <ul><li>Work on the Sponge and Cnidaria Crossword Puzzle – vocabulary review from the last 2 classes </li></ul><ul><ul><li>Helpful for homework and quizzes! </li></ul></ul><ul><li>Colour your Cnidaria worksheet according to the colour coding scheme for body systems on the Animalia Unit outline </li></ul>
  21. 22. Homework for next class: <ul><li>Complete Section Review 26-3 questions 1-5 (p. 569) </li></ul><ul><li>Complete Cnidaria crossword puzzle </li></ul><ul><li>Label and colour Cnidaria diagram handout </li></ul><ul><li>Read over class notes and check out the class blog: </li></ul><ul><li>http://msoonscience.blogspot.com/ </li></ul><ul><li>Study for Quiz on Phylum Cnidaria next class! </li></ul>

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