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Chapter24 Vocab
| Question | Answer |
|---|---|
| animal without a backbone; between 95 and 99 percent of animal species are invertebrates | Invertebrate |
| hard or tough outer covering of many invertebrates that provides support, protects body tissues, prevents water loss, and protects the organism from predation. | Exoskeleton |
| internal skeleton that protects internal organs, provides support for the organism's body, and can provide an internal brace for muscles to pull against. | Endoskeleton |
| animal with an endoskeleton and a backbone | Vertebrate |
| animal that produces both sperm and eggs in its body, generally at different times | Hermaphrodite |
| fertilized egg formed when a sperm cell penetrates and egg | Zygote |
| type of fertilization that occurs when sperm an egg combine inside an animal's body | Internal fertilization |
| type of fertilization that occurs when sperm and egg combine outside an animal's body | External fertilization |
| fluid-filled ball of cells formed by mitotic cell division of the embryo | Blastula |
| two-cell-layer sac with an opening at one end that forms from the blastula during embryonic development | Gastrula |
| inner layer of cells in the gastrula that develops into digestive organs and the digestive tract lining. | Endoderm |
| outer layer of cells in the gastrula that develps into vervous tissue and skin. | Ectoderm |
| layer of cells between the endoderm and the ectoderm that can become muscle tissue and tissue of the circulatory, respiratory, and excretory systems | Mesoderm |
| balance or similarity in body structures of organisms | Symmetry |
| body plan that can be divided along any plant, through a central axis, into roughly equal halves | Radial symmetry |
| body plan that can be divided into mirror images along only one plane through the central axis | Bilateral symmetry |
| head end of an animal with bilateral symmetry. | Anterior |
| tail end of an animal with bilateral symmetry | Posterior |
| tendency to concentrate sensory organs and nervous tissue at an animal's anterior end. | Cephalization |
| backside of an animal with bilateral symmetry | Dorsal |
| underside or belly of an animal with bilateral symmetry | Ventral |
| fluid-filled body cavity completely surrounded by mesoderm | Coelom |
| fluid-filled body cavitry between the mesoderm and the endoderm | Psudocoelom |
| animal with a solid body that lacks a fluid-filled body cavity between the guy and the body wall | Acoelomate |
| coelomate animal whose mouth develops from the opening in the gastrula | Protostome |
| coelomate animal whose anus develops from the opening in the gastrula | Deuterostome |
| organism that filters small particles from water to get its food | Filter feeder |
| organism permanently attached to one place | Sessile |
| nematocyst-containing stinging cell on a cnidarian's tentacle | Cnidocytes |
| capsule whose threadlike tube contains poison and barbs and is discharged when prey touches a cnidarian | Nematocyst |
| in cnidarians, the space surrounded by an inner cell layer, where digestion take place | Gastrovascular cavity |
| cnidarian nervous system that conducts impulses to and from all parts of the body | Nerve net |
| tube-shaped, sessile body form of cnidarians | Polyp |
| umbrella-shaped, free swimming body form of cnidarians | Medusa |
Created by:
Kdunivan
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