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22 Cards in this Set
- Front
- Back
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transport proteins
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transmembrane protein that helps certain substances to cross the membrane
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selective channels
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moo
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water potential
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physical property predicting the direction in which water will flow, governed by solute concentration and applied pressure
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circadian rhythms
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physiological cycle of 24 hrs thats present in all eukaroytes and persists even in absence of ext cues
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chemiosmosis
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a mechanism used to do work in plants
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turgor pressure
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force directed against a cell wall after the influx of water and the swelling of a walled cell due to osmosis
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casparian strip
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water-impermeable ring of wax in the endodermal cells of plants that blocks the passive flow of water and solutes into the stele by way of cell walls
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translocation
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transport of organic nutrients in the phloem of vascular plants
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bulk flow
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movement of water due to a difference in pressure between two locations
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cohesion
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binding together of like molecules, often by hydrogen bonds
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sugar source
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plant organ where sugar is being produced by photosynthesis or break down of starch
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plasmolyze
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shrink and pull away from a cell wall, or when plant protoplast pulls away from cell wall
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mycorrhizae
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mutualistic association of plant roots and fungi
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root pressure
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upward push of xylem sap in the vascular tissue of roots
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sugar sink
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plant organ that's a net consumer or storer of sugar
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turgid
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very firm.
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endodermis
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innermost layer of the cortex in plant roots. forms boundary between cortex & vascular cylinder
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guttation
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the exudation of water droplets, caused by root pressure in certain plants
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transfer cells
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companion cell with numerous ingrowths of its wall, increasing the cell's surface area and enhancing the transfer of solutes between apoplast and symplast
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tonoplast
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membrane that encloses the central vacuole in a plant cell, separating the cytosol from the vacuolar contents, called cell sap; also known as the vacuolar membrane
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symplast
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the continuum of cytoplasm connected by plasmodesmata between cells
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apoplast
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the continuum of cell walls plus the extra cellular spaces
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