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A-Level Biology OCR A

Hormonal Weed Describe Killer Works Explain Agriculture Crops

Hormonal weed killers utilize synthetic dicot auxins that kill weed species (dicots) by inducing excessive growth, while largely sparing crop plants (monocots).

Hormonal weed killers use synthetic dicot auxins, which are absorbed by weeds (mostly dicots), causing unsustainable growth and death, while most crops (monocots) are unaffected.

Front Describe an example of how a hormonal weed killer works and explain why it is useful in agriculture.
Back Hormonal weed killer:
  • Most useful crops are monocots & most weeds are dicots
  • When synthetic dicot auxins are applied as weedkiller, they are only absorbed by the weeds causing unsustainably high growth rate, effectively killing them

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