cnidarians bio 134 - sps186.org bio 134.… · 3.$two$cell$layers$separated$by$ $mesoglea...

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/


hVp://teachertube.com/viewVideo.php?video_id=128535

2. Hydrozoans feed by paralyzing prey

3. push food into mouth with tentacles


2. Hydrozoans reproduce asexually by budding

3. Does not create gene3c diversity


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


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


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

cnidarians bio 134 - sps186.org bio 134.… · 3.$two$cell$layers$separated$by$ $mesoglea...

Documents