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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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In a(n) _______, the primary root is typically the largest.

  1. a. lateral meristem
  2. b. adventitious root system
  3. c. fibrous root system
  4. d. taproot system

Summary Introduction

Concept introduction: The eudicot taproot along with its lateral root branching constitutes the taproot system. In some eudicots, the taproots are eventually replaced by the adventitious roots. Therefore, a taproot system can also develop into a fibrous root system. Carrot is a prime example of a taproot.

Explanation

Reasons for the correct statement:

The taproot is a large, central and the dominant root from which the other roots grow laterally. In a eudicot, the primary root that arises from the seed thickens and lengthens to become a taproot. The taproot can give rise to other lateral–branching roots, but it remains the largest and dominant root.

Option d. is given as, “taproot system”. As the primary root is typically the largest in the taproot system, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as, “lateral meristem”.

Lateral meristem present in the woody plants produces the secondary tissues from the ring of vascular cambium in stems and roots...

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