Biology: The Dynamic Science (MindTap Course List)
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 angiosperms are vascular plants having xylem and phloem tissues. It helps in the conduction of water, minerals, and sugar to and fro into the various parts of the plant. The potassium ions in the water influence the flow of water through the xylem.

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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.
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.
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