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Agronomy QUESTION #2048
Question 1
Allelopathy in weed science refers to:
  • The competitive advantage weeds gain through deeper root systems
  • The release of biochemical compounds (allelochemicals) by one plant into the environment that inhibit or stimulate germination, growth, or development of another plant✔️
  • The resistance developed by weeds to herbicide application over successive generations
  • The ability of weeds to fix atmospheric nitrogen, giving them a competitive advantage
Correct Answer Explanation
Allelopathy involves the release of allelochemicals (phenolic acids, terpenoids, alkaloids) from plant roots, residues, or leachates that affect neighboring plants. In weed science, allelopathic crop varieties (e.g., allelopathic rice) suppress weed germination — a key component of cultural weed management.