Biology vocabulary 26
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13 terms
Terms | Definitions |
|---|---|
 external fertilization | type of fertilization in which eggs and sperm are both released into water; fertilization occurs outside the animal's body. |
| filter feeding | method in which food particles are filtered from water as it passes by or through some part of the organism. |
| gastroboascular cavity | in cnidarians, a large cavity in which digestion takes place. |
| hermaphrodite | individual animal that can produce both eggs and sperm; increases the likelihood of fertilization in sessile or slow-moving animals. |
| internal fertilization | type of fertilization in which eggs remain inside the female's body and sperm are carried to the eggs by water or other fluid. |
| medusa | is the stage with a body shaped like an umbrella with tentacles hanging downward. |
| nematocyst | in cnidarians, a capsule that contains a coiled, threadlike tube that may be sticky, barbed, or contain poisons; used in capturing and digestion prey. |
| nerve net | simple netlike nervous system in cnidarians that conducts nerve impulses from all parts of the cnidarian's body; impulses are not controlled by a central nervous center. |
| polyp | in the life cycle of cnidarians, the stage where the body is tube-shaped, with a mouth surrounded by tentacles. |
| pharynx | in planarians, the tube like, muscular organ that extends from the mouth; aids in feeding and digestion. |
| proglottid | detachable section of a tapeworm that contains muscles, nerves, flame cells, and reproductive organs. |
| regeneration | replacement or regrowth of missing body parts by mitosis. |
| scolex | knob-shaped head of a tapeworm. |
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