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Life, 4/e

Ricki Lewis, University of New York at Albany
Mariëlle Hoefnagels, University of Oklahoma
Douglas Gaffin, University of Oklahoma
Bruce Parker, Utah Valley State College

Transport Systems in Plants

Chapter Quiz


1	True or false. One of the greatest obstacles a eukaryote must overcome is that increases in size translate to greater increases in surface area than in volume.
		A)	True
		B)	False


2	What plant nutrient is a macronutrient?
		A)	zinc
		B)	copper
		C)	nitrogen
		D)	molybdenum


3	True or false. Technicians often cover nuclear waste dump sites with live plants as a protective barrier because plants do not absorb radioactive strontium.
		A)	True
		B)	False


4	What resource provides the major source of nutrients and water to the plant?
		A)	soil A horizon
		B)	soil B horizon
		C)	soil C horizon
		D)	atmospheres


5	True or false. Roots offer a poor example of biological maximization of surface area.
		A)	True
		B)	False


6	Minerals enter the cell of a root by ________.
		A)	diffusion
		B)	facilitated diffusion
		C)	active transport
		D)	an unknown transport mechanism
		E)	both B and C


7	How are legumes at an advantage over non-leguminous plants in nutrient-poor soil?
		A)	legumes can become dormant under stressful conditions .
		B)	legumes have nodules containing Rhizobium
		C)	legumes have the capacity for luxury-uptake and can hoard nutrients
		D)	Legumes are not at an advantage over non-leguminous plants in poor soil


8	More than ___________ of the water that enters the leaf eventually leaves via transpiration.
		A)	10%
		B)	25%
		C)	50%
		D)	90%


9	How does water in the xylem travel to the mesophyll in the leaves?
		A)	by osmosis due to osmotic pressure in leaf tissue
		B)	by active transport
		C)	by a pumping mechanism unique to plants
		D)	by a vacuum created within the leaf petioles


10	What properties of water enable it to travel long distances up a plant?
		A)	cohesion
		B)	adhesion
		C)	ice is less dense than liquid water
		D)	Both a and b are correct.
		E)	All of these are correct.


11	True or false. The thinner the diameter of the xylem tube, the higher water can travel in the plant
		A)	True
		B)	False


12	A break in the flow of water through xylem is called ____________.
		A)	guttation
		B)	cavitation
		C)	dehydration
		D)	None of these is correct.


13	What happens to the plant when too many xylem tubes cavitate?
		A)	it collapses
		B)	it loses turgor pressure and dies
		C)	the top of the plant dries out
		D)	parasitic viruses invade


14	How does water move into the root?
		A)	by osmosis due to osmotic pressure in root tissue
		B)	by active transport
		C)	by a pumping mechanism unique to plants
		D)	by a vacuum created within the root


15	In the __________ pathway in the root, water moves through plasmodesmata connecting root cells.
		A)	apoplastic
		B)	symplastic


16	The impermeable ______________ blocks apoplastic movement of water, forcing water and materials to enter root cells.
		A)	root cap
		B)	pericycle
		C)	endodermis
		D)	Casparian strip


17	Leaf photosynthate is dissolved in an aqueous solution called __________ for transportation.
		A)	transport droplets
		B)	xylem liquid
		C)	phloem sap
		D)	sieve fluid


18	What is not a component of phloem sap?
		A)	carbohydrates
		B)	proteins
		C)	DNA
		D)	hormones


19	Photosynthate distribution in the plant is best described by the ___________ theory.
		A)	cohesion-tension
		B)	pressure-flow
		C)	fluid-mosaic
		D)	None of these is correct.


20	True or false. Xylem is not critical to the function of phloem; the two are located next to each other only because of the meristematic tissue that forms them.
		A)	True
		B)	False

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