Ch 36 Flashcards
Not a function of the plasma membrane proton pump
Equalizes the charge on either side of the membrane
A plant cell placed in a higher water potential (hypotonic) will
Gain water and become turgid
Transport through cytoplasmic continuum connecting neighboring cells is called
Symplastic
Bulk flow of xylem sap occurs as a result of
Root pressure and transpiration
Root pressure is attributable to
Pumping of ions into the xylem
Carries sugars from source to sink areas of a plant
Phloem
Which of the following would tend to increase rate of transpiration
Higher stomatal density (more stomata per unit leaf area)
The loading of sugars into sieve tube elements is an important process for
Translocation
What contributes directly to the turbot pressure that opens stomata
Potassium accumulation in guard cells
Plants take in ____ through their roots and ____ through their leaves
Oxygen
Carbon dioxide
Mycorrhizae enhance plant nutrition mainly by
Absorbing water and minerals through fungal hyphae
Which of the following is not part of the transpiration-cohesion-tension mechanism for the ascent of xylem sap
The active pumping of water into the xylem of roots
Sugars move from leaves into the ____ of _____ by_____
Sieve tube elements
Phloem
Active transport
What is the main cause of guttation in plants
Root pressure
Main force by which most of the water within xylem vessels moves toward the top of a tree
Evaporation of water through open stomata
Caspian strip
It ensures that all dissolves substances must pass through a cell membrane before entering the vascular tissue
Chemiosmosis begins with the active transport of
Hydrogen ions out of cells
Water potential of pure water
Zero
A chemical interferes with the establishment and maintenance of proton gradients across the membranes of plant cells. All of the following processes would be directly affected by this chemical except
Transport of xylem sap
_____ accumulation leads to water _____ and an increase in turgid pressure within guard cells that open stomata
K+
Gain
Transport via the cell walls of neighboring cells
Apoplastic
Movement of sucrose into phloem cells and the movement is nitrate into root cells occurs via
Cotransport with H+
Which of the following is not a common adaptation for xerophytes
Very large thin leaves
An increase in solute concentration will increase the water potential above zero
False
