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Agronomy QUESTION #2094
Question 1
The concept of 'phenotypic plasticity' in crop adaptation to variable environments refers to:
  • The ability of a plant's DNA sequence to mutate in response to environmental stress
  • The capacity of a single genotype to express a range of phenotypes (morphological, physiological, or behavioral) in response to different environmental conditions — without genetic change — allowing crops to partially buffer yield across variable environments✔️
  • The selection of different varieties (genotypes) for each target environment
  • The use of plastic mulch films to modify the crop microenvironment
Correct Answer Explanation
Phenotypic plasticity describes genotype × environment (G×E) interaction at the individual plant level: one genotype producing different trait expressions (leaf area, tiller number, root architecture, phenology) across environments. Crops with high plasticity can partially self-regulate resource capture. Breeders must distinguish genetic adaptation (G) from plasticity (GEI) when evaluating varieties across diverse environments.