Which one of the following types of resistance is present in a crop variety showing high degree of resistance to a pathogen but becoming susceptible to it after large scale cultivation for 4 to 5 years or so
A. Vertical resistance
B. Horizontal resistance
C. Durable resistance
D. None of these
Answer: Option A
Solution(By Examveda Team)
Resistance to plant disease is either Vertical i.e. Specific or Horizontal i.e. Nonspecific. A plant variety that exhibits a high degree of resistance to a single race or strain, of a pathogen is said to be vertically resistant. This is usually controlled by a single plant gene but after large-scale cultivation, for 4 - 5 years it becomes susceptible to it.Related Questions on Agronomy
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A. D. J. Nicholas
B. Arnon and Stout
C. J. S. Kanwar
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C. Zinc
D. Iron
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