cnidarians bio 134 - sps186.org bio 134.… · 3.$two$cell$layers$separated$by$ $mesoglea...
TRANSCRIPT
Big ideas • The process of evolu3on drives the diversity and unity of life.
• Biological systems u3lize free energy and molecular building blocks to grow, reproduce and maintain homeostasis.
• Living systems store, retrieve, transmit and respond to informa3on essen3al to life processes.
• Biological systems interact, and these systems possess complex proper3es.
1. What are Cnidarians?
3. Examples are:
2.Cnidarians –s3nging celled animals
anemone
hydra
1. What are Cnidarians?
2. Traits of Cnidarians
3. cnidocytes-‐ s3nging cells
4. contain nematocysts (barbs) w/toxin
3. Two cell layers separated by mesoglea
* endoderm/ectoderm
3. Nerve net responds to s3muli
3. Gastrovascular cavity to digest food
3. Radial symmetry
Ac3vity: Dichotomous key of invertebrates
symmetry • Asymmetrical-‐ no definite shape
• Radial symmetry-‐ top & boVom but no leW or right sides
• Bilateral symmetry-‐ head, rear, right & leW sides-‐ can be split down the center
• Exoskeleton vs. no skeleton vs. endoskeleton
• appendages: wings, arms, legs, tail
• Tentacles (are flexible) vs. spines (s3ff)
• FlaVened body (pancake like) – vs. cylindrical (tube like)
Number a paper 1-‐6 and 1-‐6 again for an open note quiz
Open note quiz
• 1. What do all Cnidarians have in common on their tentacles?
• 2. T/F A nematocyst is the barbed structure inside a s3nging cell.
• 3. T/F Cnidarians have a brain.
Open note quiz
• 4. What type of symmetry is characteris3c of jellyfish, hydra and anemones? (asymmetry, radial, bilateral)
• 5.Arthropods, including insects, have an (exoskeleton, endoskeleton).
• 6. The octopus & clam belong to the phylum (Arthropoda, Mollusca)
1. How are Cnidarians classified & what are their traits?
3. examples: hydra, Portuguese Man-‐o-‐war, obelia
2. Class Hydrozoa
Portuguese Man of War
hVp://video.na3onalgeographic.com/video/animals/invertebrates-‐animals/other-‐invertebrates/manowar_portuguese/
1. How are Cnidarians classified & what are their traits?
hVp://teachertube.com/viewVideo.php?video_id=128535
2. Hydrozoans feed by paralyzing prey
3. push food into mouth with tentacles
1. How are Cnidarians classified & what are their traits?
2. Hydrozoans reproduce asexually by budding
3. Does not create gene3c diversity
1. How are Cnidarians classified & what are their traits?
2. Hydrozoans reproduce sexually with sperm & egg
3. Creates gene3c diversity
Hydra lab
Humpback whale baleen
Open note quiz
• 1. The opening through which water leaves a sponge is called the (os3a, osculum).
• 2. A sponge that is soW and flexible is made mostly of (spongin, spicules)
• 3. Budding is an example of (asexual, sexual) reproduc3on.
• 4. A tree like body shape is called a (medusa, polyp).
• 5. Cnidarians have (radial, bilateral) symmetry
• 6. How are coral reefs most threatened?
1. How are Cnidarians classified & what are their traits? Con3nued
3. examples: coral, anemones,
2. Class Anthozoa: “flower animals”
Many types of anemones!
3. All adults are POLYP shaped
1. How are Cnidarians classified & what are their traits? Con3nued
3. Coral polyps share a mutualistic relationship with algae
4. algae use the coral waste for nutrients & coral gets oxygen & nutrients from algae
Mushroom coral
Ancient Lobe Coral
3. Anthozoans can reproduce sexually and asexually
3. Types of coral reefs
Coral reefs endangered
1. How are Cnidarians classified & what are their traits? Con3nued
3. Importance of coral reefs
4. provide habitat & food for other organisms
4. removes carbon dioxide from water to build skeletons-this reduces global warming effects
1. Class Scyphozoa-‐ true jellyfish
Jellyfish at Shedd aquarium
1. How have sponges and cnidarians evolved?
2. Cladograms show common ancestors and traits
* common trait:
* different trait:
1. How do sponges & cnidarians get food energy to build bodies?
2. Heterotrophs consume food for energy
3. digested food is used to build new carbohydrates, fats, and proteins
1. How do sponges & cnidarians store & transmit gene3c
informa3on?
2. DNA is passed on by asexual & sexual reproduction
2. DNA codes for proteins for various jobs
3. body building 3. enzymes for chemical reactions 3. cell channels for diffusion & active transport