Biology (MindTap Course List)

11th Edition
Eldra Solomon + 3 others
Publisher: Cengage Learning
ISBN: 9781337392938



Biology (MindTap Course List)

11th Edition
Eldra Solomon + 3 others
Publisher: Cengage Learning
ISBN: 9781337392938
Chapter 35, Problem 8TYU
Textbook Problem

Which of the following is a mechanism of water movement in xylem that is responsible for guttation? (a) pressure–flow (b) tension–cohesion (c) root pressure (d) active transport of potassium ions into guard cells (e) transpiration

Summary Introduction

Introduction: Water is very a important requirement for the growth of plants. Plants have developed an effective way for absorption, translocation, storage, and utilization of water. There is a vascular system in plants that conducts transportation of water in plants. Vascular system comprises two components: xylem and phloem. The transportation of water and dissolved solutes from roots toward leaves is called the ascent of sap.

Explanation of Solution

Reason for the correct answer:

Transportation of water mainly involves two pathways; first, it is root pressure, and second is transpirational pull. In the root pressure pathway, root hair cells take up minerals and water by active transport. The soil around the roots has higher content than the cell sap of root hair. Hence, water diffuses into root hair. The root hair cells now contain high water concentration; hence, water diffuses to cortical cells and then reaches the endodermis. The endodermis forces the water in xylem tubes; this pressure is because water is forced toward the xylem. This is called root pressure.

Option (c) is given as “root pressure”.

The mechanism of movement of water in xylem that is mainly responsible for guttation is called root pressure.

Hence, the correct answer is option (c).

Reasons for incorrect answers:

Option (a) is given as “pressure-flow”.

The pressure-flow model explains about the translocation of dissolved sugar in phloem.

Hence, option (a) is incorrect...

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Biology (MindTap Course List)
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