echinoderms are __________, ________, __________, ________, ____________, _____________ and...
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- Echinoderms are __________, ________, __________, ________, ____________, _____________ and ____________. * Echinoderm means _______________. All echinoderms have spiny skin.
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- There are ______ characteristics of echinoderms. All echinoderms have: Spiny skin An internal skeleton (endoskeleton) Five-part radial symmetry A water vascular system Tube feet They live in the ocean!
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- * All echinoderms have __________. Some of them have small hair-like spines, like the starfish. * Some echinoderms have long spines, like the sea urchin.
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- * The internal skeleton of an echinoderm is made of _______________________.
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- * The water vascular system also helps an echinoderm _____. * An echinoderms water vascular system is _________________________________. * The system opens to the outside through the sieve like madreporite.
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- Madreporite Opening to the outside Connects to a ring canal around the mouth 5 radial canal extend up the arms from the ring canal
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- * Echinoderms have __________. * An echinoderms tube feet are used for _________________________________.
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- *Five-part radial symmetry. * But the bodies are 2-sided. Mouth side is the oral surface & the opposite side is the aboral surface. *They have no anterior or posterior end and lack ______________.
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- Plan for the Day Review unifying characteristics of Echinoderms Examine 5 classes of the Phylum Echinodermata Check your understanding activity * Mollusc & Echinoderm test - WEDNESDAY
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- 5 Classes of Echinoderms Asteroidea Echinoidea Ophiuroidea Holothuroidea Crinoidea
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- * Carnivores: use tube feet to move and to open bivalves to eat * A sea star is able to re-grow its arms
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- Class Echinoidea Sea urchins & sand dollars * Have solid plates surrounding their internal organs *Most are detritivores or grazers.
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- * Sea urchins have a mouth hidden under its body and they eat sea algae (kelp). * A sea urchin is not very active. Sometimes, it does move slowly using its __________. When not moving it uses its feet to stick to the ocean floor. * Sea urchins have longer and sharper ________ that they use to protect themselves.
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- Class Ophiuroidea Brittle Stars * Have slim, flexible arms, and can move quickly. Can detach an arm if being attacked! * Filter feeders and detritivores that come out at night
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- Class Holothuroidea Sea cucumbers * Feed on detritus * Can expel all their internal organs as a decoy if being attacked!
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- Class Crinoidea Sea lilies & feather stars * Oldest echinoderms * Filter feeders: attach to the seafloor by a stock and use their tube feet to catch prey
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- Echinoderms: Form & Function Feeding Respiration Circulation Excretion Response Movement Reproduction
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- Feeding Sea urchins: five-part jaw to eat algae Sea stars: tube-feet to pry open mollusks shells. Evert their stomach into the mollusk shell and secretes digestive enzymes. Brings stomach and digested food back inside. (digests externally) Sea cucumbers: eat sand & detritus on the ocean floor or filter feed Sea lilies: tube-feet to trap plankton
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- Respiration & Circulation **Water vascular system** - primary system Carries oxygen, food and wastes *Tube-feet allow some diffusion through thin walls for respiration (gas exchange) *Skin gills are present in some echinoderms for gas exchange *Sea cucumber: pumps water in and out of its anus to provide oxygen to its respiratory trees
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- Excretion Nitrogen-containing wastes are excreted through thin-walled tube feet Digestive wastes (feces) are released through the anus
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- Response Primitive nervous system (no brain) Nerve ring surrounding the mouth connects to radial nerves to the body segments Senses: to detect light, gravity and chemicals
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- Movement Tube feet ! All use tube feet to move (water-vascular system) - hydraulics Sea stars & brittle stars move arms because of flexible joints Sand dollars & sea urchins move their spines Sea cucumbers move using muscular wall & tube feet
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- Reproduction External fertilization Eggs produced in ovaries & sperm produced in testes Gametes released into the water for fertilization Larvae are free swimming
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- Reproduction Regeneration Sea stars can regenerate: must contain part of the centre ring
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- Echinoderm Ecology Urchin Barren: created by overpopulation of urchins Sea stars are predators and help control the growth of mollusks (mussels) & corals
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- Echinoderm Ecology Threat to coral reefs: sea star called crown-of-thorns Feeds on coral and has destroyed coral reefs in Australia
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- Review Questions.
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