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39 Cards in this Set
- Front
- Back
The tendency of a solution to take up water from pure water is defined as the ______________ potential.
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Water |
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Water likely will flow through a semipermeable membrane to an area with a more _________ solutepotential.
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Negative |
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Water likely will flow through a semipermeable membrane to an area with a more _________ pressurepotential. |
Negative |
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If the solute potential is -0.4 and the pressure potential is 0.4, the water potential is ____________.
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0.0 |
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A houseplant that hasn’t been watered recently likely has ____________ leaf cells with ___________solute potentials.
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Flaccid/Negative |
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Maintenance of the electrochemical gradient across a plant cell membrane depends more on afunctioning ____________ pump.
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Proton |
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In the cortex of a plant root, minerals and water travel via the _____________.
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Apoplast and Symplast |
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The _______________ blocks transport of water via the _____________.
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Casparian Strip/Apoplast |
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From outside toward the center a root, the order of tissues is epidermis to_______________.
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Cortex -> Endodermis -> Pericycle |
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The Casparian strip is impregnated with _________ and is associated with the __________.
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Suberin/Endodermis |
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The stele of the root includes the ______________.
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Xylem, Phloem, and Pericycle |
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In ____________, water vapor diffuses out of leaf through stomata.
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Transpiration |
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The word for “like molecules stick together” is ______________.
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Cohesion |
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The integrity of a water column in xylem is maintained by _____________. |
Cohesion and Adhesion |
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Light activates a proton pump that moves H+ ________ guard cells with subsequent activation ofvoltage-gated _____ channels
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out of/ K+ |
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The ___________ is a waxy layer secreted by leaves to minimize water loss.
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Cuticle |
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Stomata open when the guard cells __________.
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Swell |
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_____________ are pores in leaves that allow CO2 uptake and water loss
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Stomata |
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Sucrose from ____________ cells is loaded into sieve-tube elements of phloem, and water follows by___________.
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Source/Osmosis |
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Movement of water by osmosis into sieve-tube elements increases the ___________ potential in pholem.
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Pressure |
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ψp is positive for a _________ cell.
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Turgid |
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__________ potential is the osmotic potential or effect of dissolved particles.
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Solute |
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__________ potential is the tendency of a solution to take up water from pure water.
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Water |
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If for a solution the ψp equals 0.4 and ψs equals -0.4, then ψ equals ____________ (number).
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0 |
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The cell wall exerts no pressure on the protoplast when the cell loses turgor pressure and becomes_________.
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Flaccid |
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In a plant root, water often moves to the xylem via the __________, which includes the cell walls andintercellular spaces.
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Epoplast |
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Water moves from the cytoplasm of one cell to the cytoplasm of the next cell via connections called_______________.
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Plasmadesmata |
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The Casparian strip contains a “water-proofing” substance called _________.
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Suberin |
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The ____________ is the specific layer of tissue in a root associated with the Casparian strip.
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Endodermis |
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Diffusion of water vapor out of stomata is known as _____________.
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Transpiration |
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The word __________ describes the attraction of water to the walls of xylem.
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Adhesion |
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The _________ is a waxy layer covering leaves.
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Cuticle |
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___________ are pores in a leaf that allow CO2 uptake and water loss.
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Stomata |
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A light-activated ___________ pump increases the negativity inside guard cells.
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Proton |
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Describe the relationship between ψp and ψs in a fully turgid cell, and indicate how this relationshipaffects ψ
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Fully turgid cell: The relationship is that they're equal and opposite. Pressure increases |
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In a root, why does water transported via the apoplast have to transfer to the symplast in theendodermis?
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The Casparian Strip blocks ions and water |
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What occurs in transpiration and why important for water transport in the xylem?
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Water is diffused out of the stomata and there is an increase in surface tension due to evaporative loss. it is important because it pulls H2O up. |
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How does activation of a proton pump in guard cells lead to opening of stomata?
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Light activates the proton pump, H+ is transported out of the guard cells. The increased negativity inside opens the K+ channels. K+ and Cl- flow into guard cells. Water potential of guard cells becomes more negative. Guard cells swell opening the stomata |
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According to the pressure-flow model, how is sucrose moved within phloem from a source cell to a sinkcell?
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Loading occurs at source cells, Sucrose produced in mesophyll moves via symplast/apoplast to sieve-tube elements or companion cells. Sucrose from apoplast enters via a sucrose-proton symport |