18. Which statement is true about transport in plants? a. Water is transported by the xylem in upward and downward directions. b. Sugars manufactured in the leaves are transported through the phloem by tension cohesion mechanism. c. Sugars always move from source to sink, in an upward direction. d. Sugars always move from sink to source, in a downward direction. e. Sugars are transported from source to sink, in any direction.

18. Which statement is true about transport in plants? a. Water is transported by the xylem in upward and downward directions. b. Sugars manufactured in the leaves are transported through the phloem by tension cohesion mechanism. c. Sugars always move from source to sink, in an upward direction. d. Sugars always move from sink to source, in a downward direction. e. Sugars are transported from source to sink, in any direction.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter35: Stem Structure And Transport

Section: Chapter Questions

Problem 7TYU: Water potential is (a) the formation of a proton gradient across a cell membrane (b) the transport...

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9. Describe the process of water transport in plants from the roots to the leaves. What roles do xylem, osmosis, and transpiration play in this process? Discuss how environmental factors can affect water transport in plants. 1. 2. 3. 0088 Doo ooooooo Transpiration draws water from the leaf. Cohesion and adhesion draw water up the xylem. Negative water potential draws water into the root. Mesophyll cells Xylem Stoma Xylem Root hairs Soil particle Water molecule Xylem Low Water potential gradient High Atmosphere: --100 MPa Leaf at tip of tree: --1.5 MPa Stem: -0.6 MPa Root cells: -0.2 MPa
Which of the following would require active transport? Select one: O a. Stomata opening b. Potassium moving through an ion channel O c. Water moving through aquaporins O d. Water diffusing into xylem from the root e. The tension in the leaf caused by evaporating water
(4) a. Which one of the following process is responsible for carrying water to the leaves of a tall plant through xylem vessels : a. Transpiration pull b. Root pressure c. b. Absorption through roots Euron The reason for my answer is: a. Due to a force of moving water upward through xylem vessels b. Deficiency of water in the xylem C. Due to a upward pressure exerted by roots d. Removal of water from the leaves and fill that deficiency
What role do cohesion and adhesion play in xylem transport?a. Like transpiration, they create a tension.b. Like root pressure, they create a positive pressure.c. Like sugars, they cause water to enter xylem.d. They create a continuous water column in xylem.e. All of these are correct.
According to the pressure-flow model, sugar is actively transported into phloem anda. enters xylem, where it is moved toward the leaves due to transpiration.b. creates pressure to move water toward the roots.c. is transported out of the leaves through stomata.d. water follows by osmosis, providing pressure that moves the water and sugar through the phloem.
Sucrose enters the phloem tubes from mesophyll cells in the leaf by: O a. Proton pumps (hydrogen ions are pumped out as sucrose is pumped in). O b. Sucrose pumps. Oc. Co-transport with hydrogen ions. O d. Diffusion down a gradient. O e Osmosis (water carrying the sucrose is sucked in).
(3) a. b. The characteristics of water molecules to maintain a continuous column of water is: a. Root pressure b. Transpiration C. d. Forces Cohesion - Addison The reason for my answer is because : a. Releasing water as water vapors b. A pressure excreted by root through root system C. Releasing water from tips of leaves as liquid d. Interaction among water molecules and adsorption of water molecules to walls of xylem vessels
3. Transport through the Phloem Identify the statement that would describe the identified parts of the diagram. Write the number on the spaces before each statement. Transpiration Movement of the phloem sap is bidirectional (may be up and down) depending to the location of sink cells. pulls water up xylem vessels. Source cell Sieve tube Companion cell Xylem Sucrose enters the phloem from the source cells through the companion cells. H,O H,0 Sucrose Sieve tube element Internal pressure differences drive the phloem sap along the sieve tube to sink cells. Sieve plate Sink cell Water transfers to the xylem by osmosis raising the pressure potential on the sieve tube. Sucro Sucrose is unloaded into sink cells ...and water moves back into the xylem by osmosis. increasing the water potential in the sieve tube.
20 (8) a. Which one of the following phenomena is responsible for transportation of food through phloem tissue : a. Mass flow b. Diffusion C. Osmosis b. The reason for my answer is: a. Movement of particles for higher concentration to lower concentration b. Movement of particles of a material to one direction due to gravity C. Movement of particles of a material to direction due to pressure gradient d. Movement of materials as a bulk due to pressure gradient
Plants obtain water and nutrients from the soil.a. What structure in a plant uses water in a metabolic reaction? What is this metabolic process called? b. Describe in detail two mechanisms by which water can move from the roots to this location c. If a plant was exposed to saltwater, how would it affect the above processes? Be specific, including a discussion of water potential d. How do plants absorb minerals from the soil? Does this process require energy?
i. Based on Figure 2, identify the structure that regulates the movement of water and minerals towards the xylem in the root. ii. Name structure of the cell membrane allows it to act as a selective barrier? iii. Predict what will happen to the transportation of water and minerals through the plasma membrane if the root was poisoned and no cellular respiration occurred.
1. Compare and contrast Apoplastic and Symplastic pathways of water in plants. 2. What causes the opening and closing of guard cells of stomata during transpiration? 3. Differentiate sources and sinks 4. Define transpiration and give some of its significance 5. How do root hairs absorb water?