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

Plant hormones _______.

  1. a. trigger the same responses in animals and plants
  2. b. are cues for tropisms
  3. c. do not participate in stress responses.
  4. d. may have different effects in different tissues.

Summary Introduction

Concept introduction: Plant hormones (phytohormones) are chemical molecules that are produced by plants in very low concentrations. They do a signaling function by which all the major functions in a plant body are sequentially coordinated. Flowering process, fruit ripening, shedding of leaves are some of the major functions associated with phytohomones. In plants, they are not synthesized locally; rather, they often diffuse into all the other parts.


Reason for the correct answer: Plant hormones are the biochemical molecules produced by plants in extremely low concentrations for assisting many important functions in the plant body. There are several types of hormones imposed with different characteristic functions. Auxins, gibberellin, cytokinins are some of the familiar phytohormones. Biosynthesis of these hormones are not localized, rather they diffuse out into various other parts of the plant body with the help of transport proteins.

Option d. is given as, “may have different effects in different tissues”. Since phytohormones can move from one region to the other with the help of transport proteins that do different functions in different plant tissues, option d. is the correct answer.

Reasons for the incorrect answers:

Option a...

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