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? P. Q. and R P. R and S OP, Q, R and S P, Q, and S

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? P. Q. and R P. R and S OP, Q, R and S P, Q, and S

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
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
Choose all the correct statements for the graph above: A.in a mutant plant that makes TWICE the normal number of stomata on the leaf, we would expect the line to shift down (i.e. water potential would become more negative). B. During the period starting with time B and ending with time D, the water potential in the leaf is increasing. C.Transpiration rates are the highest around time B. D.At time A we expect to see the greatest volume of water moving up the xylem to this leaf.
Which of the following statements is/are FALSE for CAM plants? a.The dark reaction uses less ATP and NADPH than other plants. b.Succulents and tropical plants growing under semi-arid condition. c.C4 pathway occurs at night and C3 pathway occurs at daytime. d.Scotoactive stomata are open during daytime but close at nighttime.
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?
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 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?
Harvest of cork from cork oaks (Quercus suber) is _________________, because it involves targeted (i.e., intentional) removal of the __________________, and the ________ is unaffected. (recall that inner bark = secondary phloem)
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
This is the location of the carbon fixation reactions in C4 plants. Select one: a. the leaf's spongy mesophyll b. none of these answers c. the leaf's bundle sheath cells d. the palisade mesophyll e. the nearest apical meristem
Which of the following is a mechanism of phloem transport in which dissolved sugar is moved by means of a pressure gradient that exists between the source and the sink? (a) pressure–flow (b) tension–cohesion (c) root pressure (d) active transport of potassium ions into guard cells(e) guttation