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

A tropism is a _______ response.

  1. a. defensive
  2. b. directional
  3. c. dilational
  4. d. detrimental

Summary Introduction

Concept introduction: The phenomenon by which plants response to their environmental stimuli like light, gravity or water is known as tropism. Although plants are unable to move from their respective location to other places, they are adapted with certain characters that allow them to do necessary movements depending upon the situation. Tropism is such an adaptation meant for the better survival of the plant groups. There are different types of tropism which are named according to the stimulus associated with it.


Reason for correct answer: A plant’s biological capacity to move by itself in reaction with various external stimuli like light, chemical, gravity is known as tropism. It is simply a directional stimulus leading to a movement response in plants. Depending upon the nature of the stimuli associated with the movement produced, tropism has been variously classified. Phototropism, chemotropism, hydrotropism are the directional changes produced in response to light, chemicals and water respectively.

Option b. is given as “directional”. Since tropism is the movement of plants to a particular direction in relation with particular stimuli, option b. is the correct answer.

Reason for incorrect answers:

Option a. is given as “defensive”...

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