Life Science: Invertebrates 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Invertebrate | An animal without a backbone.
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| Spongin | A fibrous protein that functions like a skeleton in certain sponges.
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| Spicule | Sharp pointed structures in spongin made of calcium carbonate.
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| Filter Feeder | An organism that obtains food from water circulating through its body.
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| Nematocyst | A type of stinging cell possessed by certain cnidarians; used for defense or paralyzing prey.
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| Bilateral Symmetry | Symmetry in which one plane divides a structure in half from top to bottom.
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| Radial Symmetry | Symmetry in which several different planes can divide a structure in half through the center.
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| Neuron | A long thin cell that carries impulses.
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| Nerve | A bundle of neurons arranged side by side and wrapped in a protective covering.
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| Ganglion | A mass of nerve tissues; sometimes called a simple brain.
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| Stimulus | Anything that causes a response in an organism.
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| Sensory Receptor | A structure capable of receiving stimulus from the environment.
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| Circulatory System | A system of transporting blood throughout an organism.
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| Aortic Arches | Organs that help control blood pressure in earthworms.
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| Water Vascular System | A series of canals and tubules in echinoderms used for feeding and movement.
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| Capillary | One of many SMALL blood vessels with walls one cell thick.
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| Vein | Larger blood vessels that carry blood to the heart (open).
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| Collar cells | Cells in a sponge with flagella to pump water.
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| Osculum | The opening in a sponge that excretes water and unused nutrients.
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| Free Living | An animal that does not live inside and is not living dependent to another animal.
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| Parasite | A living organism that lives within, obtains nutrition from , and harms another living organism.
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| Medusa | The freely-swimming, umbrella- or disk-shaped gelatinous form of Cnidarians.
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| Flagella | A long whip-like tail as a part of a cell.
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| Cilia | Short hair-like structures on cells.
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| Siphons | A tube which forces water through an organism for movement.
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| Nerve Net | A network of neurons apparently continuous with one another and conducting impulses in all directions.
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| Pharynx | The tube that extends from the mouth and connects to the digestive tract and respiratory tract.
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| Radula | A muscular ribbon in mollusks (other than bivalves) which scrapes for food with sharp teeth-like structures.
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| Crop | A pocket-like place where food is stored in earthworms prior to the gizzard.
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| Gizzard | The part of an earthworm's digestive tract that breaks down food by grinding it with muscles.
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| Porifea | Sponges
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| Cnidaria | Sea jellies, Corals, Anemones.
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| Platyhelminthes | Flat worms.
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| Nematoda | Round worms.
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| Mollusca | Mollusks - Snail, Clams, Octopus, Squids.
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| Annelida | Segmented worms.
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| Echinodermata | Sea stars, Urchins, Sand dollars.
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| Digestive glands | A group of tissues that produce enzymes for breaking down food.
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| Ring canal | The circular water tube that surrounds the esophagus of echinoderms.
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| Regenerate | Able to grow back.
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| Univalve | ONE piece shell.
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| Bivalve | TWO piece shell.
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| Gastrovascular cavity | An opening in the digestive system of a simple animal that breaks food down into the cellular level.
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| Polyp | A body form of a cnidarian, such as a hydra or coral, that is cylindrical in shape, has a mouth usually surrounded by tentacles at one end, and is often attached to something at the other end.
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Created by:
MsRobinG
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