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Bio Ch 36

Transport in Vascular Plants

QuestionAnswer
Which of the following would least likely to affect osmosis in plants? receptor proteins in the membrane
Active transport involves all of the following except the slow movement through the lipid bilayer of a membrane
Like many plants process, transport of various material in plans at the cellular level requires all of the following except: xylem membranes
Which of the following is an example of osmosis? flow of water out of a cell, flow of water between cells
The amount and direction of movement of water in plants can always be predicted by measuring which of the following? water potential
Which of the following is true concerning the water potential of a plant cell? It is equal to zero when the cell is in pure water and is turgid.
Your laboratory partner has an open beaker of pure water. By definition, the water potential of this water is? zero
Which of the following has an effect on water potential in plants? air pressure, water-attracting matrices and dissolved solutes
If Wp =.3 MPa and Ws = -.45 then this equals -.15 MPa
The value for water potential in a root was found to be -.15 MPa. If you take the tissue and place it in a solution of sucrose with a -.23, water will flow where? from the tissue into the sucrose
COmpared to a cell with a few aquarporins in its membrane, a cell containing many aquaporins will... have a faster rate of osmosis
Some botanists agree tha the entire plant should be considered a single unit rather than a composite of may individual cells. Which of the following cellular structures cannot be used to support this view? tonoplast
Which of the following statements is false about bulk flow? It depends on the force of gravity on a column of water.
Which of the following statements about xylem is incorrect? It transports mainly sugars and amino acids
Which of the following would likely not contribute to the surface area available for water absorption from the soil by a plant root system? endodermis (they are water resistant and waxy)
Root hairs are most important to a plant because they ... increase the surface area for absorption
What is the role of proton pumps in root hair cells? acquire minerals form the soil
In plant roots, the casparian e strip is correctly described by which of the following? It ensures that all water and dissolved substance must pass through a cell before entering the stele
All of the following describe an important component of the long-distance transport process in plants except endodermis Casparian strip
Pine seedlings grow in sterile potting soil grow much slower than seedlings grown in soil from the are where the seeds were collected. This is most likely because: the normal symbiotic fungi are not present in the sterilized soil and water and mineral uptake is faster when mycorrhizae are present.
A water molecule could move all the way through a plant from soil to root to leaf to air and pass through a living cell only once. this living cell would be part of what structure? the endodermis
The following factos may sometimes play a role int he movement of sap through the xylem. Which one depends on the direct expenditure of ATP by the plant? concentration of ions in the symplast
What is the main cause of guttation in plants root pressure
One is the most likely to see guttation in small plants when the.. root pressure exceeds transpiration pull
What is the main force by which most of the water within xylem vessels moves toward the top of a tree? evaporation of water through the stoma
In which plant cell or tissue would the pressure component of water potential most often be negative? stem xylem
Water potential is generally most negative in which of the following part of a plant? mesophyll cells of the leaf
Which of the following has the lowest (most negative) water potential? leaf air spaces
Which of the following is responsible for the cohesion of water molecules hydrogen bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule
Active transport would be least important in the normal functioning of which of the following plant tissue types? stem xylem
Guard cells do which of the following? help balance the photosynthesis-transpiration compromise
All of the following normally enter the plant through the roots except: carbon dioxide
Photosynthesis begins to decline when leaves wilt because stomata close, preventing CO2 entry into the leaf
The water lost during transpiration is an unfortunate side effect of the plant's exchange of gases. However, the plant derive some benefit from this water loss in the form of.. evaporative cooling and increased turgor
Ignoring all other factors, what kind of day would result in the fastest delivery of water and minerals to the leaves of a tree? warm, dry day
If the guard cells and surrounding cells in a plant are deficient in potassium ions, all of the following would occur except.. leaf temperatures would decrease
The opening of stomata is thought to involve... an increase in the osmotic concentration of the guard cells
Which of the following experimental procedures would most likely reduce transpiration while allowing the normal growth of a plant? Increasing the level of carbon dioxide around the plant.
All of the following are adaptation that help reduce water loss from a plant except.. transpiration
Phloem transport of sucrose can be describe as going from "source to sink". Which of the following would not normally function as a sink? mature leaf
Which of the following is a correct statement about sugar movement in phloem? Movement can occur both upward and down in the plant.
Phloem transport is described as being from source to sink. Which of the following would most accurately complete this statement about transport? Phloem transport --- from the --- source to the--- sink. Phloem transports sugars from the leaf source to the apical meristem sink.
Explain the mass flow of materials in the phloem? leaf cells produce sugar by photosynthesis; Sugar is transported from cell to cell in the leaf; Solutes are actively transported into sieve tubes; water diffuses into the sieve tubes; sugars moves down the stem
Water flows into the source end of a sieve tube because sucrose has been actively transported into the sieve tube, making it hypertonic
Which one of the following statements about transport of nutrients in phloem is false? Companion cells control the rate and direction of movement of phloem sap.
According to the pressure flow hypothesis of phloem transport, solute move from a high concentration in the "source" to a lower concentration in the "sink"
Which of these involves a symbiotic relationship? mycorrhizae
------ increase the surface area of roots. Root hairs and mycorrhizae
In roots the ------- forces water and solutes through the plasma membranes of the ----- cells before entering the -------. Casparian strip; endodermis; xylem
Sugars move from leaves into the ------ of ----- by ------. Sugars move from leaves into the sieve-tube members of the phloem by active transport.
The water pressure that pulse water and sugar from sugar source to sugar sink is referred to as ----. bulk flow
Transpiration in plants requires all of the following except active transport through xylem cells.
Which of the following is an advantage of tracheids over vessels for long-distance transport to great heights? Adhesive forces are proportionally greater in narrower cylinders than in wider cylinders and Cohesive forces are greater in narrow tubes than in wide tubes of the same height.
Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because... ATP is required to power proton pumps in the guard cell membranes.
Created by: KC Croy KC Croy on 2009-03-17



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