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Agronomy QUESTION #2076
Question 1
The Vavilovian mimicry in weeds is an evolutionary adaptation where:
  • Weeds produce toxins that mimic crop plant hormones
  • Weeds evolve morphological resemblance to the crop they infest (similar leaf shape, height, seed size/color) making them difficult to distinguish and remove by hand weeding or seed cleaning — driven by the selection pressure of repeated hand removal of distinctly different-looking plants✔️
  • Weeds develop herbicide resistance by mimicking the target enzyme of the herbicide
  • Weed seeds mimic crop seeds in dormancy requirements to synchronize germination
Correct Answer Explanation
Vavilovian mimicry is convergent evolution driven by human selection pressure: in hand-weeded or hand-harvested crops, weeds that morphologically resemble the crop escape removal and are inadvertently harvested and re-sown with crop seed. Classic examples: barnyard grass mimicking rice, rye mimicking wheat, Camelina mimicking flax. It is strongest in crops with long histories of hand weeding.