Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

_______ is the hormone in most rooting compounds.

  1. a. Gibberellin
  2. b. Auxin
  3. c. Cytokinin
  4. d. ABA

Summary Introduction

Concept introduction: Auxins are a group of phytohormones involved in many cardinal processes in plant tissues. The main functions associated with auxins are the growth and development of the plant parts, especially root and shoot systems. It is in the apical meristem of the plant, and auxin is very abundantly seen. Other than growth and development, gravittropic movements and photoperiodism in plants are also controlled by auxins.


Reason for the correct answer: Auxins are a major class of phytohormones cardinally involved in many important processes in the plant body. Elongation of shoot, controlling of seed orientation, and root branching are some of the main functions that are done by auxins. Most of the rooting compounds contain auxin in a large amount as it is the chief hormone involved in the root branching. If a cut stem is applied with an auxin, it starts to produce roots at the cut.

Option b. is given as “Auxin”. Auxins are mainly involved in the growth and development of the plant body, they initiate root and shoot initiation, so option b. is the correct answer.

Reason for the incorrect answer:

Option a...

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