bio 1020 unit 5 vocab
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21 Terms
Absorption
Light energy that is captured or retained by pigment molecules during photosynthesis.
Absorption spectrum
A graph showing the amount of light absorbed by individual pigments at various wavelengths.
Accessory pigments
Molecules that absorb light energy and pass it to the principal pigment, chlorophyll a.
Action spectrum
A graph showing photosynthetic activity by a plant at various wavelengths.
Carotene
An accessory orange-colored pigment.
Chlorophyll a
A green pigment; this is the principal pigment in all photosynthetic organisms.
Chlorophyll b
An accessory green pigment.
Chromatogram
A developed chromatography strip in which pigments have been separated from one another.
Chromatography
A method of separating pigment molecules in a solution based on the different solubilities of pigments in the chromatography solvent.
Cuticle
A waxy non-cellular layer on the outer surface of the plant leaf that prevents water loss by evaporation.
Epidermis
The outermost layer of cells in plants.
FT50
The floating time for 50% of the discs in a floating disc assay.
Guard cells
Specialized epidermal cells that occur in pairs on leaf surfaces and regulate the opening into the interior of the leaf.
Palisade layer
Chloroplast-bearing cells in the interior of the leaf that are oriented with their long axes perpendicular to the leaf surface.
Pigment
A molecule that absorbs light energy.
Reflection
Light energy that is not absorbed by pigment molecules, but is turned back.
Rf
The ratio of fronts for pigments and the solvent on a chromatogram.
Spongy layer
Loosely-packed chloroplast-bearing cells in the interior of leaves, characterized by lots of air space.
Stomata
Openings on leaf surfaces through which air passes to the leaf interior (singular is stoma, plural is stomata).
Transmission
Light energy that is not absorbed by an object, but passes through it; it is also the light that is reflected by the object.
Wavelength
A measure of the quality of light, technically the distance between the peaks of two waves, informally known as the color of light.