Plant Defense Mechanisms (MCQ with Answer Key)







Plant defense refers to mechanisms that plants employ to protect themselves from pathogens, herbivores, and environmental stresses. These include physical barriers, chemical compounds like toxins or repellents, and signaling pathways that trigger responses against threats, enhancing survival and resilience. This is MCQ on Plant Defense Mechanisms and its Significance.

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1. 
What are plant defense mechanisms primarily aimed at protecting plants against?

2. 
Which part of a plant is often the first line of defense against herbivores?

3. 
What is the term for the specialized cells or structures that some plants have to deter herbivores through physical means?

4. 
Which plant hormone is responsible for initiating the synthesis of defensive compounds in response to herbivore attack?

5. 
What is the main function of alkaloids in plant defense?

6. 
Which of the following is an example of an inducible plant defense mechanism?

7. 
Some plants produce volatile organic compounds (VOCs) when damaged by herbivores. What is the function of these VOCs?

8. 
Which of the following is an example of a constitutive defense mechanism in plants?

9. 
What is the role of lignin in plant defense?

10. 
Which of the following is an example of physical defense against herbivores in plants?

11. 
What is the primary function of systemic acquired resistance (SAR) in plants?

12. 
The release of digestive enzymes to break down herbivore tissues, leading to their death, is a characteristic of which type of plant defense?

13. 
What is the hypersensitive response (HR) in plants?

14. 
Which of the following is a constitutive chemical defense compound found in some plants that can inhibit herbivore feeding and reproduction?

15. 
What is the term for the relationship in which ants protect plants from herbivores in exchange for food and shelter provided by the plants?

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MCQ on Plant Defense




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