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

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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Water 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 situation
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.
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.
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.
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
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 would tend to increase transpiration?(A) spiny leaves(B) sunken stomata(C) a thicker cuticle(D) higher stomatal density
But 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?
The electrochemical gradient is __________________. A. The total chemical potential gradient B. The total electrical potential gradient C. All the above Water and mineral nutrients are transported from root to shoot via __________________ A. Plasmodesmata B. Xylem C. Phloem D. Cell wall
Approximately 10 percent of water within the atmosphere has been released by plants by transpiration. Which is the best method for measuring the transpiration rate within an individual plant? A. Measure osmotic pressure within the guard cells to determine amount of time stomata are open. B. Weigh the plant before and after a 24 hour period while accounting for evaporation from the soil. C. Access the abiotic conditions and how the plant has adapted to its native environment. D. Measure water loss by placing a plastic bag over a stem of the plant and subtracting the amount of water released into the bag from the amount of water within the soil.
Which of the following is true for the function of xylem and phloem? * A. Xylem transports water from leaves to roots; phloem transports sugar from roots to leaves B. Xylem transports sugar from roots to leaves; phloem transports water from leaves to roots C. Xylem transports water from roots to leaves; phloem transports sugar from leaves to roots D. Xylem transports sugar from leaves to roots; phloem transports water from roots to leaves