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

In some plants, flowering is a ________ response.

  1. a. phototropic
  2. b. gravitropic
  3. c. photoperiodic
  4. d. thigmotropic

Summary Introduction

Concept introduction: The term photoperiodism is usually used to describe the ability of a plant to flower in response to the changes in its photoperiod. Plants that flower only when the day length is less than a threshold are called short-day plants and those flower only when the day length crosses a certain threshold are called long-day plants. There are certain other groups that flowering does not depend on the day length are known as day–neutral plants.


Reason for the correct answer: There are some plants that require a definite day or night length in order to undergo flowering. Based on the requirement of the day length, it has been classified into long-day plants, short-day plants, and day-neutral plants. Flowering would not occur if the plants are not exposed to their definite photoperiod.

Option c. is given as “photoperiodic”. Since in many plants flowering is a photoperiodic response, option c. is the correct answer.

Reason for the incorrect answer:

Option a. is given as “phototropic”...

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