Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 29, Problem 3TYU
Summary Introduction

Introduction:

The movement of xylem sap in resistance to the gravity is maintained by transpiration-cohesion-tension mechanism. Transpiration lowers the water potential in leaves which generate a negative pressure potential that draw up the water from roots to leaves through the xylem

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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.
After sucrose enters sieve tubes,a. it is removed by the source.b. water follows passively by osmosis.c. it is driven by active transport to the source, which is usuallythe roots.d. stomata open so that water flows to the leaves.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.
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