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

Which of the following statements is false?

  1. a. Auxin and gibberellin promote stem elongation.
  2. b. Cytokinin triggers growth of lateral buds.
  3. c. Abscisic acid promotes water loss and dormancy.
  4. d. Ethylene promotes fruit ripening and abscission.

Summary Introduction

Concept introduction: Plant hormones (phytohormones) are the chemical molecules produced by plant tissues in extremely low concentrations for assisting many cardinal functions like flowering, fruit ripening, photoperiodism, and stress relief. They also help in sex determination of the flowers produced by the plant. There are five major phytohormones, which are auxin, gibberellin, cytokinin, abscisic acid and ethylene. Each of these has their own characteristic functions also.


Reason for the correct answer: Abscisic acid is one of the major phytohormones produced by plants. It is commonly seen near the leaves, stems, and unripe fruits. The major functions associated with abscisic acid are closing of stomata, protect the plant from dehydration, bud dormancy, and root growth. Most of the water stored in the plant body is lost by transpiration. Abscisic acid protects the plant from excessive loss of water by signaling the stomata to close at relevant period.

Option c. is given as “abscisic acid promotes water loss and dormancy”. Since one of the major functions of abscisic acid in plants is to reduce water loss and protect the plant from dehydration, the given statement is false. Therefore, option c. is the correct answer.

Reason for the incorrect answer:

Option a...

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