Key Terms

airtight seal
completely sealed so that no air can get in or out of it
calibrated pipette
to prevent inaccuracies in order to attain better results, performance, and longevity of the pipette itself
evaporate
change of water from liquid to gaseous state, often removing heat from a wet surface
fluorescent light
a usually tubular electric lamp having a coating of fluorescent material on its inner surface and containing mercury vapor whose bombardment by electrons from the cathode provides ultraviolet light which causes the material to emit visible light
guard cells
each of a pair of curved cells that surround a stoma, becoming larger or smaller according to the pressure within the cells
plant cutting
a section of plant such as a modified stem, leaf, or root used for vegetative propagation that forms either adventitious shoots, adventitious roots (stem and single node cuttings), or both (root and leaf)
photometer
an instrument for measuring the intensity of light
stomata
any of the minute pores in the epidermis of the leaf or stem of a plant, forming a slit of variable width which allows movement of gases in and out of the intercellular spaces
transpiration
(of a plant or leaf) the exhalation of water vapor through the stomata

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Lab Manual for Biology Part I (V2) Copyright © 2022 by LOUIS: The Louisiana Library Network is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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