| TERM | GROUP | DEFINITION | |
|---|---|---|---|
| VALVE | N | PROTISTS | Pronunciation: Etymology: Valves are walls or frustules of diatoms. |
| VALVE VIEW | NP | PROTISTS | Pronunciation: Etymology: A valve view is the view of a diatom frustule from the top so that either the epivalve or the hypovalve presents itself. |
| VANE | N | PROTISTS | Pronunciation: Etymology: A vane is a longitudinal flange that occurs on many of the motile cells of the excavates. When they occur, flanges are always found on the recurrent or posteriorly-directed flagellum. |
| VASCULAR BUNDLE | N | PLANTS | Pronunciation: Etymology: One of the strands of tissue that conducts water and nutrients within the plant. Consists of xylem on the inside and phloem on the outside, separated by a layer of cambium. |
| VAS DEFERENS (VASA DEFERENTIA) | NP | ANIMALS | Pronunciation: Etymology: The vas deferens is the tube that leads from the testis through which sperm are discharged to the outside. |
| VELIGER | N | ANIMALS | Pronunciation: Etymology: An veliger is a mollusk larval stage that develops from the trochophore. |
| VELUM (VELA) | N | ANIMALS, FUNGI | Pronunciation: Etymology: (1)A velum is a veil-like membranous structure. (2)In a larval lamprey (the ammocoete larva) the velum (labeled v) is a membrane that serves to direct water to the gill pouches and away from the esophagus. (3)Sheet of tissue stretching from stipe over top of mushroom cap. |
| VENTER | N | PLANTS | Pronunciation: Etymology: The base of the archegonium; holds the egg. |
| VERMIFORM LARVA (VERMIFORM LARVAE) | NP | ANIMALS | Pronunciation: Etymology: Vermiform larvae develop from the axoblasts of the vermiform adult. They emerge from the axoblasts and attach to the cephalopod kidney. |
| VESSEL | N | PLANTS | Pronunciation: Etymology: (1) Vessels are special xylem cells that have a large diameter and can move larger amounts of water than the smaller tracheids. Vessels, though found in the gnetophytes, are characteristic of the flowering plants. (2) long tube of vessel elements connected by perforation plates. These are typical of the wood of flowering plants and gnetophytes. |
| VESTIBULUM (VESTIBULA) | N | PROTISTS | Pronunciation: Etymology: A vestibulum is a depression with the cytostome at the base of it. It occurs at the anterior end of certain ciliates. Sometimes, the crypt of cryptomonads is called a vestibulum. |
