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Porifera and Cnidarians

Porifera and Cnidarians. Porifera Information. RESPIRATION: Takes in water through pores and canals. Obtains oxygen from the water. CIRCULATION: Pores conduct water and move it through body Choanocytes - move water inside Porifera OTHER: Antibacterial

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Porifera and Cnidarians

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  1. Porifera and Cnidarians

  2. Porifera Information • RESPIRATION: • Takes in water through pores and canals. • Obtains oxygen from the water. • CIRCULATION: • Pores conduct water and move it through body • Choanocytes- move water inside Porifera • OTHER: • Antibacterial • Have either radial symmetry or asymmetrical • Parazoa- no true tissues • No gut • Feed through diffusion

  3. Porifera Information • EXCRETION: • Water washes away CO2 and other wastes • RESPONSE: • Very low reactions to environment • No nervous system • MOVEMENT: • None • Sessile • REPRODUCTION: • Asexual budding or sexually

  4. Cnidaria Information • RESPIRATION: • Gas exchange over entire surface • CIRCULATION: • Diffusion • EXCRETION: • Canal-like cavity uses diffusion for liquid waste • Solids are dissolved • RESPONSE: • Nerve net- probably evolved into nervous system • MOVEMENT: • Polyp: endoskeleton or exoskeleton • Medusa: hydrostatic skeleton • Jet propulsion

  5. Cnidaria Information • OTHER: • Coral build ecosystems • Radical or bilateral symmetry • Feed through diffusion • Coelem: none • Gut opening: one • Two germ layers: • Gastrodermis and gastrovascular cavity • Tissue complexity: • Eumetazoa • REPRODUCTION:

  6. Innate Behavior- Porifera • Water diffusion • Water filtration and expulsion • Obtaining food • Camouflage with the environment to avoid predators • Sexual and Asexual reproduction • Coordinated movements of cells can let porifera produce body contractions even though these are mostly sessile creatures.

  7. Innate Behavior- Cnidaria • Water diffusion • Water expulsion and filtration • Movement through flagella (free moving cnidarians like jellyfish) • Able to sense light and move towards it despite the fact that most do not have eyes • Sexual and Asexual reproduction • When threatened, eject poison tipped barbs to attack and paralyze predators (free moving cnidarians like jellyfish)

  8. Learned Behavior • Able to imitate other, more dangerous organisms to ward off predators • Able to learn more effective ways to swim through ocean currents • Able to control amount of water that flows through their bodies • Some can morph their bodies so that they are not swept up by ocean currents or trampled by bigger organisms (ex. Some sponges can use their coordinated cell movements to flatten themselves against the ocean floor)

  9. Cooperative Behavior- Porifera • Able to imitate other, more dangerous organisms to ward off predators • Able to learn more effective ways to swim through ocean currents • Able to control amount of water that flows through their bodies • Some can morph their bodies so that they are not swept up by ocean currents or trampled by bigger organisms (ex. Some sponges can use their coordinated cell movements to flatten themselves against the ocean floor)

  10. Cooperative Behavior- Cnidaria • Free moving cnidarians like Jellyfish do not have brains or nerves to think, but have a nerve net to sense others and respond. • Some Jellyfish can flash colorful lights to either attract prey or signal to other jellyfish. This bioluminescent power can definitely come in handy. • Also, often times a jellyfish can release certain chemicals when it is about to breed, so that other jellyfish can follow and all give birth at the same time to ensure survival.

  11. Big Idea 1- Evolution • PORIFERA • Many individual cells working together, but can survive on their own and come back together if separated • CNIDARIA • First organisms to exhibit radial symmety • First organisms with to exhibit a primitive nervous system, nerve net

  12. Big Idea 2- Energy • PORIFERA • Different cells perform specialized functions such as gathering energy, reproduction, etc. rather than all the cells needing to perform all necessary functions for survival. • CNIDARIA • Cnidarians are one of the early organisms to exhibit movement throughout the organism, allowing them to easily capture food

  13. Big Idea 3- Information • Essentially the same as learned behaviors • Neither Porifera or Cnidaria truly use information. • Porifera (sponges) are a huge benefit to the environment. They are important in nutrient cycles in coral reef systems. They can also absorb good and bad bacteria when they filter the water around them and make the water clean for other organisms to live in. This process also lowers excess nitrogen levels, preventing harmful environmental changes. • Cnidarians like coral are also a huge benefit to the environment. Having an enormous role in regulating the CO2 content of the ocean, the coral reefs are something we cannot afford to lose. Coral has many uses, including food for animals, and medicinal uses for humans. They also protect coasts from strong currents Big Idea 4- Interactions

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