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Chapter 24 Vocab
Vocabulary
| Question | Answer |
|---|---|
| fluid-filled ball of cells formed by mitotic-cell division of the embryo. | blastula |
| outer layer of cells in the gastrula that develops into nervous tissue and skin. | ectoderm |
| inner layer of cells in the gastrula that develops into digestive organs and the digestive tract lining. | endoderm |
| 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 |
| hard or tough outer covering of many invertebrates that provides support, protects body tissues, prevents water loss, and protects the organism form predation. | exoskeleton |
| type of fertilization that occurs when sperm and egg combine outside an animal's body. | external fertilization |
| two-cell-layer sac with an opening at one end that forms from the blastula during embryonic development. | gastrula |
| animal that produces both sperm and eggs in its body, generally at different times. | hermaphrodite |
| type of fertilization that occurs when sperm and egg combine inside an animal's body. | internal fertilization |
| animal without a backbone; between 95 and 99 percent of animal species are invertebrates. | invertebrate |
| layer of cells between the endoderm and the ectoderm that can become muscle tissue and tissue of the circulatory, respiratory, and excretory systems. | mesoderm |
| animal with an endoskeleton and a backbone. | vertebrate |
| fertilized egg formed when a sperm cell penetrates an egg. | zygote |
| animal with a solid body that lacks a fluid-filled body cavity between the gut and the body wall. | acoelomate |
| head end of an animal with bilateral symmetry. | anterior |
| body plant that can be divided into mirror images along only one plane through the central axis. | bilateral symmetry |
| tendency to concentrate sensory organs and nervous tissue at an animal's anterior end. | cephalization |
| fluid-filled body cavity completely surrounded by mesoderm. | coelom |
| coelmate animal whose anus develops from the opening in the gastrula. | deuterostome |
| backside of an animal with bilateral symmetry. | dorsal |
| tail end of an animal with bilateral symmetry. | posterior |
| coelomate animal whose mouth develops into the gametophyte plant. | protostome |
| temporary cytoplasmic extension that sarcodines use for feeding and movement. | pseudocoelom |
| body plan that can be divided along any plane, through a central axis, into roughly equal halves. | radial symmetry |
| balance or similarity in body structures of organisms. | symmetry |
| underside or belly of an animal with bilateral symmetry. | ventral |
| nematocyst-containing stinging cell on a cnidarian's tentacle. | cnidocyte |
| organism that filters small particles from water to get its food. | filter feeder |
| in cnidarians, the space surrounded by an inner cell layer, where digestion takes places. | gastrovascular cavity |
| umbrella-shaped, free-swimming body form of cnidarians. | medusa |
| capsule whose threadlike tube contains poison and barbs and is discharged when prey touches a cnidarian. | nematocyst |
| cnidarian nervous system that conducts impulses to and from all parts of the body. | nerve net |
| tube-shaped, sessile body form of cnidarians. | polyp |
| organism permanently attached to one place. | sessile |
Created by:
dayleemiller
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