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(A) The introduction of high-yielding varieties (HYVs) has led to the widespread adoption of a limited number of genetically uniform crop strains.This

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Introduction of high-yielding varieties

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(A) The introduction of high-yielding varieties (HYVs) has led to the widespread adoption of a limited number of genetically uniform crop strains.This practice replaces the traditional,diverse landraces and local varieties that were naturally adapted to various environmental conditions.As a result,the genetic diversity within agricultural crops is significantly reduced,making the entire crop population more vulnerable to pests,diseases,and changing environmental conditions.

Genetic diversity in agricultural crops is threatened by

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