Biology (MindTap Course List)
Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 35, Problem 16TYU
Summary Introduction

To determine: Whether water will flow by osmosis from one plant cell with water potential of -1.5MPa to another plant cell with water potential of -1.8MPa.

Introduction: Water is the most crucial factor for a plant to perform its normal cellular functions. The water is absorbed by the roots. The movement of water from the roots to the leaves can be explained using cohesion tension theory of water transport. The water movement from the roots to the vascular tube (xylem) is facilitated by osmosis. Water potential plays an important role in understanding plant physiology because it helps to measure a cell’s ability to absorb water by osmosis.

Summary Introduction

To determine: The direction of water flow when a plant cell with a water potential water potential of -1.5MPa to another plant cell with water potential of -1.8MPa.

Introduction: Water is the most crucial factor for a plant to perform its normal cellular functions. The water is absorbed by the roots. The movement of water from the roots to the leaves can be explained using cohesion tension theory of water transport. The water movement from the roots to the vascular tube (xylem) is facilitated by osmosis. Water potential plays an important role in understanding plant physiology because it helps to measure a cell’s ability to absorb water by osmosis.

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Imagine a cell with a water potential of –0.1 MPa being placed in a beaker of solution that also has a water potential of –0.1 MPa. Are the two water potentials in equilibrium? Would any water molecules be moving between the cell and the solution? Would there be a net movement of water? Now imagine a root in moist soil, and imagine that the root cortex cells have a water potential of –0.1 MPa and that the soil solution also has a water potential of –0.1 MPa. Would there be any net movement of water into the root?
Explain what would happen if a plant cell was placed in a hypotonic environment and why (be sure to include solute concentrations, water movement and turgor pressure in your explanation)?
The water potential of three adjacent plant cells  are as follows: X 0kPa Y  -1000kPa Z -4000kPa In which direction will water move?
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