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

Systemic acquired resistance ________.

  1. a. occurs in response to pathogen detection
  2. b. causes the release of volatile chemicals
  3. c. is a hypersensitive response to pathogens
  4. d. defends the plant against herbivory
  5. e. does not involve hormones

Summary Introduction

Concept introduction: Systemic acquired resistance is a type of resistance response induced in a plant following an earlier attack by a pathogen. It protects the plant body from a wide range of fungal and viral attacks. Whenever a plant gets attacked by a pathogen, its systemic-acquired resistance gets activated by that moment itself. This type of resistance has a very close similarity with the innate immunity in mammals.


Reason for correct answer: The mechanism by which a plant can be induced to trigger their defense reactions to a variety of plant pathogens as a result of previous exposure to pathogens or any other physical stress is known as systemic-acquired resistance. It lasts for a long period in the plant’s body, and it requires salicylic acid and other pathogenesis-related protein for producing the resistance.

Option a. is given as “occurs in response to pathogens detection”. Since systemic-acquired resistance in a plant body gets induced only after a prior attack of a plant pathogen, option a. is the correct answer.

Reasons for incorrect answer:

Option b. is given as “causes the release of volatile chemicals”. Since systemic-acquired resistance does not involve the release of any volatile chemicals, option b...

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