Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 35.3, Problem 2C
Summary Introduction
To describe: The way by which pressure-flow model explains sugar movement in phloem and includes activities at source and sink.
Introduction: Vascular plants consist of two specialized tissues called as xylem and phloem that act as conducting tubes in plants for the transportation of water and sugar molecules throughout the plant. Phloem vessels are involved in transporting the prepared food (glucose) from leaves to all parts of the plants.
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Consider the pressure flow model of phloem transport. How do sugars and water enter the phloem from the source? How do sugars and water move from one phloem cell to another?
The following are some statements about long distance translocation of photo assimilates in higher plants:
P. Sugars are translocated in the phloem by mass transfer along a hydrostatic pressure.
Q. The translocated carbohydrates are mostly nonreducing sugars
R. Munch pressure-flow hypothesis is crucial to drive translocation in the phloem
S. Allocation and partition of carbon within a source leaf determine the phloem loading phenomenon
Which of the following combinations of the above statements is true?
OP, Q, and R
OP. R and S
OP, Q, R and S
OP, Q, and S
Compare the energy needs of a plant for the movement of water in the xylem according to the cohesion-tension model to the movement of phloem sap according to the pressure-flow model?
Chapter 35 Solutions
Biology (MindTap Course List)
Ch. 35.1 - Prob. 1LOCh. 35.1 - Prob. 2LOCh. 35.1 - Prob. 3LOCh. 35.1 - Prob. 1CCh. 35.1 - Prob. 2CCh. 35.1 - Prob. 3CCh. 35.1 - Prob. 4CCh. 35.1 - What is the difference between terminal and...Ch. 35.2 - Prob. 4LOCh. 35.2 - Prob. 5LO
Ch. 35.2 - Prob. 6LOCh. 35.2 - Prob. 1CCh. 35.2 - How does the tensioncohesion model explain the...Ch. 35.3 - Describe the pathway of sugar translocation in...Ch. 35.3 - Prob. 8LOCh. 35.3 - Prob. 1CCh. 35.3 - Prob. 2CCh. 35 - Prob. 1TYUCh. 35 - Ground tissue in monocot stems performs the same...Ch. 35 - Prob. 3TYUCh. 35 - Prob. 4TYUCh. 35 - Prob. 5TYUCh. 35 - Prob. 6TYUCh. 35 - Water potential is (a) the formation of a proton...Ch. 35 - Prob. 8TYUCh. 35 - Prob. 9TYUCh. 35 - Which of the following is a mechanism of phloem...Ch. 35 - How does increasing solute concentration affect...Ch. 35 - Prob. 12TYUCh. 35 - Prob. 13TYUCh. 35 - Prob. 14TYUCh. 35 - EVOLUTION LINK Like stems in general, some vines...Ch. 35 - Prob. 16TYU
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- Which phloem loading will involve sucrose-proton transporter and what are the correlating factors in determining the type of phloem loading pathways? *arrow_forwardDescribe the hypothesis of pressure flow for the transportation of sugars in the plants.arrow_forwardAmong the following combinations, which row is transpiration streams at respective cases? O Up the stem in the Across leaf via apoplast xylem patway mass flow osmosis Up the stem in the xylem osmosis Across leaf vla apoplast patway mass flow Up the stem in the Across leaf via apoplast xylem patway mass flow mass flow Up the stem in the Across leaf via apoplast xylem patway mass flow mass flow Out of leaf via stomata diffusion Out of leaf via stomata osmosis Out of leaf via stomata diffusion Out of leaf via stomata osmosis Into root Across root via symplast cells pathway diffusion osmosis Into root cells diffusion Into root cells osmosis Into root cells osmosis Across root via symplast pathway osmosis Across root via symplast pathway osmosis Across root via symplast pathway osmosisarrow_forward
- List the correct sequence of events for the movement ofwater in xylem, and sucrose in phloem.arrow_forwardWhen considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE? Select one: a. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. b. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. c. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.arrow_forwardWhat does hydraulic conductance mean in the following? The hydraulic limitation hypothesis proposes that reduced growth in taller trees is caused by decreased photosynthesis resulting from a decrease in hydraulic conductance promoted by a longer root-to-leaf flow path.arrow_forward
- Discuss the transpiration-cohesion-adhesion theory of water movement in the plant system.arrow_forwardBased on the cohesion-tension theory, what could be the potential shortfall and how would plant overcome this shortfall? *arrow_forwardWhen considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE?arrow_forward
- How are sugars transported in phloem? the formation of starch from sugar in the sink increases the osmotic concentration high turgor pressure in source sieve-tube elements pushes phloem sap to sink sieve-tube elements with low turgor pressure water is actively transported into the source region of the phloem to create the turgor pressure needed the combination of a high turgor pressure in the source and transpiration water loss from the sink moves solutes through phloem conduitsarrow_forwardIn the form of schematic diagram; briefly illustrate the process that occurs during the cohesion–tension theory of sap ascent is shown.arrow_forwardImagine you have a plant with a water potential of -0.1 MPa in the root tissue. What would happen if you place the roots of this plant in a 0.1 M solution of sucrose (water potential is -0.23 MPa)? The net water flow would be from the tissue into the sucrose solution The net water flow would occur only as ATP was hydrolyzed in the tissue The net water flow would be from the sucrose solution into the tissue The net water flow would be in both directions and the concentration of water would remain equal The net water flow would be impossible to determine from the values given herearrow_forward
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