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chap24 vocab
biology
| 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, protect 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 peretrates and egg. | Zygote |
| Type of fertilization that occurs when sperm and 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 |
| 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 develops into nervous 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 plane, 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 cavity between the mesoderm and the endoderm. | Pseudocoelom |
| Animal with a solid body that lacks a fluid-filled body cavity between the gut 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 ell layer, where digestion take place. | Gastrovascluar 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 |
| Umbrell-shaped, freeswimming body form of cnidarians. | Medusa |
| Two-cell-layer sac with an opening at one end that forms from the blastula during embryonic development. | Gastrula |
Created by:
jessc14
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