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Bob Jones Life Science - Chapter 12

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Question
Answer
invertebrate   An animal that lacks a backbone.  
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filter feeder   An organism that obtains food from water circulating through the its body.  
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radial symmetry   A body pattern in which several different planes could divide an animal into equal halves.  
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nematocyst   A stinging cell used by cnidarians for defense or for capturing food.  
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bilateral symmetry   A type of symmetry in which there are two equal sides to an animal; only one plane can divide it into equal halves.  
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ganglion   A mass of nerve tissue;sometimes called a simple brain.  
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stimulus   Anything that causes a response in an organism.  
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closed circulatory system   A type of circulation in which the blood remains in vessels.  
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aortic arches   Organs that help to control blood pressure in earthworms.  
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water-vascular system   A series of canals and tubules in echinoderms; used for movement and feeding.  
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exoskeleton   An external skeleton composed of tough plates that protect and support certain animals.  
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compound eye   An eye having many small lenses that provides a mosaic of images rather than a single image  
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open circulatory system   The type of circulation in which the blood passes from blood vessels into body spaces around organs and tissues before returning to the heart.  
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tracheae   One of the tiny tubes that branch throughout the body, carrying air to the tissues; in humans and vertebrate animals, the tube that carries air between the pharynx and the lungs  
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metamorphosis   A changing of an animal's shape or form as the animal develops from an egg to an adult.  
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molting   To shed scales, feathers, fur or an exoskeleton  
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incomplete metamorphosis   Insect metamorphosis that includes three stages: egg, nymph, and adult.  
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nymph   The immature stage of an insect with incomplete metamorphosis.  
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complete metamorphosis   Insect metamorphosis that consists of four stages: eggs, larva, pupa, and adult.  
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larva   An immature stage in the life cycle of many animals.  
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pupa   A resting stage during the complete metamorphosis of certain insects.  
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