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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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The activity of lateral meristems _______ older roots and stems.

  1. a. lengthens
  2. b. thickens
  3. c. both a and b

Summary Introduction

Concept introduction: Lateral meristems are cylindrical layers of the meristem that run lengthwise through shoots and roots. The lateral meristems include the vascular cambium and cork cambium. Vascular cambium is the lateral meristem that produces the secondary xylem and phloem. Cork cambium is the lateral meristem that forms the cork which protects, insulates, and waterproofs the stem or root surface.

Explanation

Reasons for correct statement:

When the plants undergo the secondary growth, their shoots and roots will thicken and become woody. In the eudicot and the gymnosperms, this lengthening and thickening arise at the lateral meristem.

 Option c. is given as “both a and b”. As both the thickening and lengthening of the older roots and stems originates from the lateral meristem, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “lengthens”...

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