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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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A _____ strip between abutting endodermal cell walls forces water and solutes to move through these cells rather than around them.

  1. a. cutin
  2. b. Casparian
  3. c. cohesion
  4. d. cellulose

Summary Introduction

Introduction: Casparian strips are the bands made of suberin (sometimes lignin) found on the endodermal cells, which tightly connects each cell’s plasma membrane. It is a feature found in the roots of higher plants. It creates a barrier between the endodermal cell wall that enables the water flow through the endodermal cytoplasm.

Explanation

Reason for the correct answer: Casparian strip present in the endodermal root cells allows the water to enter through cell wall, plasma membrane, and plasmodesmata and transport through cytoplasm of the cell.

Option b. is given as “Casparian”. Casparian strips are arranged in the radial and transverse walls of the endodermis. They prevent the entrance of water around the cell and directly allow the water molecules to flow inside the cytoplasm of the endodermal cell to xylem vascular tubes.

Hence, option b. is correct.

Reasons for the incorrect answers:

Option a. is given as “cutin”. Cutin is a waxy and water repellant substance present over the protective layer (cuticle) of a leaf’s epidermis in plants. Cutin occurs in the leaves, whereas the Casparian strips occur in the roots of plants.

Hence, option a. is incorrect.

Option c...

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