The following statements are correct except* a. Assimilates are transported from areas of supply to areas of metabolism or storage. b. The transport of assimilates in the phloem is bi-directional. c. Allocation is the distribution of assimilates to competing sinks. d. Sugars, phytohormones and amino acids are transported in the phloem.

The following statements are correct except* a. Assimilates are transported from areas of supply to areas of metabolism or storage. b. The transport of assimilates in the phloem is bi-directional. c. Allocation is the distribution of assimilates to competing sinks. d. Sugars, phytohormones and amino acids are transported in the phloem.

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

Chapter33: Plant Structure, Growth, And Development

Section: Chapter Questions

Problem 6TYU

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When 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.
Which of the following statements is/are false? A. Water is actively transported from source cells into companion cells. B. The transport of sucrose into the Osieve tube elements increases water potential in the phloem. C. The transport of water from the xylem into the phloem increases the O pressure which forces the sucrose water mixture down towards the sink. D. Transpiration cause the water to O move up to the leaves through the vessel elements. E. A and B F. B and C
Which of the following statements is inaccurate?a. Water that evaporates from leaves is ultimately replaced by water diffusing from the xylem.b. Xylem transports water up the plant while phloem transports carbohydrates throughout the plant.c. Water movement in the xylem is largely due to the pressure-flow hypothesis.d. Water movement across membranes is often due to differences in solute concentrations.
Which of the following is/are false regarding the phloem? A. It transports starch from the leaves to the stem. B. It transports sucrose from the leaves to the roots. C. It is located lateral to the xylem in tree stems. D. Unlike the xylem, majority of the cells are living. E. A and D F. B and C
Salinity or salt stress induces the following plant responses except: * A. Induction of osmoregulatory compounds B. Compartmentalization of salt ions in the cytoplasm C. Compartmentalization of salt ions in the central vacuole D. Exclusion of salt ions
An essential nutrient that plant require only small amounts of that cannot be transported from the tissue it was originally deposited in is classified as a Select one: O a. Mobile macronutrient O b. Immobile micronutrient O c. Mobile micronutrient O d. Water O e. Immobile macronutrient
Water movement through the xylem needs less pressure than movement through living cells. A. Agree, because water moves in xylem through diffusion. B. Disagree, because water needs turgor pressure in order to diffuse. D. Disagree, beacuse both need equal pressure for materials to pass through xylem and living cells like sievetubes. C. Agree, because water is non-living while photosynthates are living and must pass through living cells that require pressure.
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 movement of water out of phloem sap and back into xylem vessels is often associated with which of the following events? active transport of water out of the phloem sap into a source а. b. passive diffusion of phloem sap into a source active transport of sugars out of the phloem sap into a sink C. hydrostatic push (pressure) forcing phloem sap into a sink Od.
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.
The pressure-flow model of phloem transport states thata. phloem content always flows from the leaves to the root.b. phloem content always flows from the root to the leaves.c. water flow takes sucrose from a source to a sink.d. water pressure creates a flow of water toward the source.e. Both c and d are correct.
Arrange the following four events in an order that explains the mass flow of materials in the phloem. 1)Water diffuses into the sieve tubes.2)Leaf cells produce sugar by photosynthesis.3)Sucrose is actively transported into sieve tubes.4)Sugar moves down the stem due to positive pressure. A. 1, 2, 3, 4 B. 2, 3, 1, 4 C. 4, 2, 1, 3 D. 2, 4, 1, 3