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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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When guard cells swell, ______.

  1. a. transpiration ceases
  2. b. sugars enter phloem
  3. c. stomata open
  4. d. root cells die

Summary Introduction

Introduction: Guard cells are the cells that are present above and below surfaces of leaves. It controls the transfer of gaseous and water molecules during the transpiration. Guard cell contains a small opening structure called as stomata through which the molecules escape.

Explanation

Reason for correct answer: When the water volume is abundant in the cell, the plant will increase its transpiration rate. Guard cells present on the leaves swell when water content is higher. As a result, it triggers the stomata to open and allows the water molecules to escape from the cells. This is how it maintains the water level when excess water is absorbed.

Option c. is given as “stomata open”. Stomata opens when there will be an increase in water content in the guard cells that enables the water molecule to get away from the leaves.

Hence, the correct answer is option c.

Reasons for incorrect answers:

Option a. is given as “transpiration ceases”. Transpiration helps in the transport of water molecules from the xylem to leaves. A swelling in guard cells triggers the transpiration pull...

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