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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.

Water

Water likely will flow through a semipermeable membrane to an area with a more _________ solutepotential.

Negative

Water likely will flow through a semipermeable membrane to an area with a more _________ pressurepotential.

Negative

If the solute potential is -0.4 and the pressure potential is 0.4, the water potential is ____________.

0.0

A houseplant that hasn’t been watered recently likely has ____________ leaf cells with ___________solute potentials.

Flaccid/Negative

Maintenance of the electrochemical gradient across a plant cell membrane depends more on afunctioning ____________ pump.

Proton

In the cortex of a plant root, minerals and water travel via the _____________.

Apoplast and Symplast

The _______________ blocks transport of water via the _____________.

Casparian Strip/Apoplast

From outside toward the center a root, the order of tissues is epidermis to_______________.

Cortex -> Endodermis -> Pericycle

The Casparian strip is impregnated with _________ and is associated with the __________.

Suberin/Endodermis

The stele of the root includes the ______________.

Xylem, Phloem, and Pericycle

In ____________, water vapor diffuses out of leaf through stomata.

Transpiration

The word for “like molecules stick together” is ______________.

Cohesion

The integrity of a water column in xylem is maintained by _____________.

Cohesion and Adhesion

Light activates a proton pump that moves H+ ________ guard cells with subsequent activation ofvoltage-gated _____ channels

out of/ K+

The ___________ is a waxy layer secreted by leaves to minimize water loss.

Cuticle

Stomata open when the guard cells __________.

Swell

_____________ are pores in leaves that allow CO2 uptake and water loss

Stomata

Sucrose from ____________ cells is loaded into sieve-tube elements of phloem, and water follows by___________.

Source/Osmosis

Movement of water by osmosis into sieve-tube elements increases the ___________ potential in pholem.

Pressure

ψp is positive for a _________ cell.

Turgid

__________ potential is the osmotic potential or effect of dissolved particles.

Solute

__________ potential is the tendency of a solution to take up water from pure water.

Water

If for a solution the ψp equals 0.4 and ψs equals -0.4, then ψ equals ____________ (number).

0

The cell wall exerts no pressure on the protoplast when the cell loses turgor pressure and becomes_________.

Flaccid

In a plant root, water often moves to the xylem via the __________, which includes the cell walls andintercellular spaces.

Epoplast

Water moves from the cytoplasm of one cell to the cytoplasm of the next cell via connections called_______________.

Plasmadesmata

The Casparian strip contains a “water-proofing” substance called _________.

Suberin

The ____________ is the specific layer of tissue in a root associated with the Casparian strip.

Endodermis

Diffusion of water vapor out of stomata is known as _____________.

Transpiration

The word __________ describes the attraction of water to the walls of xylem.

Adhesion

The _________ is a waxy layer covering leaves.

Cuticle

___________ are pores in a leaf that allow CO2 uptake and water loss.

Stomata

A light-activated ___________ pump increases the negativity inside guard cells.

Proton

Describe the relationship between ψp and ψs in a fully turgid cell, and indicate how this relationshipaffects ψ

Fully turgid cell: The relationship is that they're equal and opposite. Pressure increases

In a root, why does water transported via the apoplast have to transfer to the symplast in theendodermis?

The Casparian Strip blocks ions and water

What occurs in transpiration and why important for water transport in the xylem?

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.



How does activation of a proton pump in guard cells lead to opening of stomata?



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

According to the pressure-flow model, how is sucrose moved within phloem from a source cell to a sinkcell?

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