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13 Cards in this Set

  • Front
  • Back
Plants must always compromise between _____ and _____.



maximizing water loss ... minimizing H+ protons


maximizing transport of minerals ... minimizing transport of sugars


maximizing photosynthesis ... minimizing water loss


maximizing access to light ... minimizing intake of CO2


maximizing water absorption ... minimizing leaf area

maximizing photosynthesis ... minimizing water loss
A plant cell placed in a solution with a lower (more negative) water potential will _____.



lose water and plasmolyze


gain water and plasmolyze


gain water and become turgid


lose water and burst


lose water and become turgid

lose water and plasmolyze

Which of the following is a correct statement about a difference between xylem and phloem transport?




Transpiration moves phloem sap but not xylem sap.


Xylem sap moves up; phloem sap moves up or down.


Active transport moves xylem sap but not phloem sap.


Xylem sap moves from sugar source to sink, but phloem sap does not.


Phloem carries water and minerals; xylem carries organic molecules.

Xylem sap moves up; phloem sap moves up or down.

A student is performing a chemical analysis of xylem sap. This student should not expect to find much _____.




phosphorus


sugar


water


nitrogen


potassium

sugar

Which one of the following refers to the loss of water through the stomata in a plant's leaves?




bulk flow


guttation


transpiration


osmosis


respiration

transpiration

In addition to transporting sugar, the phloem also _____.




transmits electrical signals


transports viral RNA throughout the plant


transports plant RNA throughout the plant


transports proteins throughout the plant


All of the above

All of the above

Which structure or compartment is part of the symplast?




the cell wall of a root hair


the interior of a vessel element


an extracellular air space


the cell wall of a mesophyll cell


the interior of a sieve tube

the interior of a sieve tube

Movement of phloem sap from a source to a sink




depends on tension, or negative pressure potential.


depends on pumping water into sieve tubes at the source.


occurs through the apoplast of sieve-tube elements.


depends ultimately on the activity of proton pumps.


results mainly from diffusion.

depends ultimately on the activity of proton pumps

Photosynthesis ceases when leaves wilt, mainly because




accumulation of CO2 in the leaf inhibits enzymes.


stomata close, preventing CO2 from entering the leaf.


the chlorophyll in wilting leaves is degraded.


flaccid mesophyll cells are incapable of photosynthesis.


photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency.

stomata close, preventing CO2 from entering the leaf.

Which of the following would tend to increase transpiration?




a rainstorm


spiny leaves


higher stomatal density


sunken stomata


a thicker cuticle

higher stomatal density

Select the accurate statement about water potential.




Free water moves from a region of lower water potential to a region of higher water potential.


Adding solutes to water increases water potential.


Water in a turgid cell has positive pressure potential.

Water in a turgid cell has positive pressure potential.

Select the correct mechanism of stomatal opening and closing.



The radial orientation of cellulose microfibrils in the cell walls of guard cells causes them to bow outward and open the stomatal pore when turgid.


Light stimulates proton pumps in the plasma membrane of the guard cells, causing them to lose K+ and become flaccid.


The cell walls of guard cells are thickened on the side of the stomatal opening and the thinner walls bow outward when the guard cells become turgid, to close the stomata.

The radial orientation of cellulose microfibrils in the cell walls of guard cells causes them to bow outward and open the stomatal pore when turgid.
If a plant’s stomata are closed and no transpiration is occurring, which of the following predictions is accurate?



Without transpiration, the plant will be water deficient.


Without transpiration, the plant’s cells will become flaccid.


Without transpiration, less water will be absorbed from the soil.

Without transpiration, less water will be absorbed from the soil.