Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 34, Problem 2ITD
Summary Introduction
To review:
Whether the results support a hypothesis that the flow rate of xylem sap slows in response to a decline in ion concentration of potassium chloride.
Introduction:
All the
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When considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE?
Question 6
The diagram shows how water can adhere to the xylem in the stems of plants, which contributes to water movement in the plant. Which of the following best explains how water is able to move upward from
the roots of a plant, through its xylem in the stem, and out to the leaves?
-Water Molecuie
-Xylem Cell
Xylem
Cell Wall
B) If you have a mesophyll cell in a leaf (a living, parenchyma cell in a leaf) with a slight positive
turgor pressure (Yp = 0.01 MPa) and solutes (Ys = -3.0 MPa), and it is next to a xylem vessel
element with very few solutes in the xylem sap (Ys = -0.01 MPa) but high physical tension (Yp
= - 2.0 MPa), which way will water flow?
a) from the mesophyll cell into the vessel element
b) from the vessel element into the mesophyll cell
c) neither direction. They are at equilibrium.
Activa
GoroSe
Chapter 34 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 34.1 - Prob. 1SBCh. 34.1 - Prob. 2SBCh. 34.1 - Explain how the apoplastic, symplastic, and...Ch. 34.2 - Prob. 1SBCh. 34.2 - Prob. 2SBCh. 34.3 - Prob. 1SBCh. 34.3 - Prob. 2SBCh. 34.3 - Prob. 3SBCh. 34.4 - Prob. 1SBCh. 34.4 - Prob. 2SB
Ch. 34.5 - Compare and contrast translocation and...Ch. 34.5 - Prob. 2SBCh. 34 - Prob. 1TYKCh. 34 - Prob. 2TYKCh. 34 - Prob. 3TYKCh. 34 - Prob. 4TYKCh. 34 - Prob. 5TYKCh. 34 - Prob. 6TYKCh. 34 - Prob. 7TYKCh. 34 - Prob. 8TYKCh. 34 - An indoor gardener leaving for vacation completely...Ch. 34 - Prob. 10TYKCh. 34 - Prob. 11TYKCh. 34 - Prob. 12TYKCh. 34 - Discuss Concepts Concerns about global climate...Ch. 34 - Prob. 14TYKCh. 34 - Apply Evolutionary Thinking A variety of...Ch. 34 - Prob. 1ITDCh. 34 - Prob. 2ITDCh. 34 - Prob. 3ITD
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- 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 Sarrow_forwardBut how are the two types of mesophyll involved? From what I understand, CO2 enters the stomata, and then the citric acid cycle of the mitochondia in the mesophyll use the carbon atoms do produce glucose, which then goes through phloem loading and it either used or stored. My question, I guess, is how exactly are the two types of mesophyll involved? Is only one used or are both used at different times in the production of the glucose?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
- The xylem cell has a water potential of -45 MPa and the mesophyll cell of the leaf has a water potential of -57MPa. Which way does the water move?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_forward(b) Water absorbed by plant roots travels by different pathways from the root hairs to the xylem. Figure 5 shows these pathways in a plant root. cell A xylem vessel root hair key pathway B Tissue D Tissue E * pathway C Figure 5: Schematic representation of water movement through the tissues of a plant root (PLEASE TURN OVER) Page 6 CONT'D from Page 5 i. Explain how water moves from the root hair to the xylem vessels in the root. ii. Identify cellA, pathway B, pathway C, tissue D and tissue E in Figure 5.arrow_forward
- What 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_forwardThe water potential in the leaves is -30 MPa and -20 MPa in the xylem, the water moves to the _ and if the water potential in the roots is -30 MPa and -45 MPa in the xylem, the water moves to the?arrow_forwardThe pathogenic fungus Fusicoccum amygdali secretes atoxin called fusicoccin that activates the plasma membrane proton pumps of plant cells and leads to uncontrolled water loss. Suggest a mechanism by which theactivation of proton pumps could lead to severe wilting.arrow_forward
- Phytochrome, plays an important role in flowering in many plants. It can also be used to determine when lettuce seeds germinate (shown in the figure below Which scenario(s) above produce large amounts of the active form of phytochrome? A B A & C B & Darrow_forwardWater potential is (a) the formation of a proton gradient across a cell membrane (b) the transport of a watery solution of sugar in phloem (c) the transport of water in both xylem and phloem (d) the removal of sucrose at the sink, causing water to move out of the sieve tubes (e) the free energy of water in a particular situationarrow_forwardUnlike the movement of water in the xylem, phloem sap movement is not defined by gravity. It can move upward and downward in the plant. During very hot weather, when the plant root is converting sugar to store as starch, state the role of root and V. leaves. Source Punca: Sink Sinki:arrow_forward
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