Question:
Given below are two statements:
Assertion (A): Horizontal resistance is durable as it is non-race specific.
Reason (R): Race specific resistance puts pressure on the pathogen to evolve more virulent races.
Given below are two statements:
Assertion (A): Horizontal resistance is durable as it is non-race specific.
Reason (R): Race specific resistance puts pressure on the pathogen to evolve more virulent races.
Assertion (A): Horizontal resistance is durable as it is non-race specific.
Reason (R): Race specific resistance puts pressure on the pathogen to evolve more virulent races.
Show Hint
Horizontal resistance is non-race specific and durable, while vertical resistance is race specific and may break down easily.
Updated On: May 18, 2026
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is not the correct explanation of A
- A is correct but R is not correct
- A is not correct but R is correct
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The Correct Option is B
Solution and Explanation
Concept:
Horizontal resistance and vertical resistance are two important types of disease resistance in plants.
Step 1: Understand horizontal resistance.
Horizontal resistance is non-race specific. It acts against many races of a pathogen and is usually controlled by many genes. Because of this broad effect, it is generally more durable. \[ A \text{ is correct} \]
Step 2: Understand race specific resistance.
Race specific resistance is also called vertical resistance. It is effective against specific races of a pathogen. Such resistance may put selection pressure on pathogen populations, causing the evolution of more virulent races. \[ R \text{ is correct} \]
Step 3: Check explanation.
Reason talks about race specific resistance, while Assertion talks about horizontal resistance. Both statements are correct, but Reason does not directly explain the durability of horizontal resistance. \[ \therefore \text{Correct Answer is (B)} \]
Horizontal resistance and vertical resistance are two important types of disease resistance in plants.
Step 1: Understand horizontal resistance.
Horizontal resistance is non-race specific. It acts against many races of a pathogen and is usually controlled by many genes. Because of this broad effect, it is generally more durable. \[ A \text{ is correct} \]
Step 2: Understand race specific resistance.
Race specific resistance is also called vertical resistance. It is effective against specific races of a pathogen. Such resistance may put selection pressure on pathogen populations, causing the evolution of more virulent races. \[ R \text{ is correct} \]
Step 3: Check explanation.
Reason talks about race specific resistance, while Assertion talks about horizontal resistance. Both statements are correct, but Reason does not directly explain the durability of horizontal resistance. \[ \therefore \text{Correct Answer is (B)} \]
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