Weeds affect the crop plants by

  • A
    killing of plants in field before they grow
  • B
    competing for various resources of crops (plants) causing low availability of nutrients
  • C
    dominating the plants to grow
  • D
    all of the above

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Neem and turmeric powders are often used in grain storage.
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$(ii)$ What is the purpose of using neem and turmeric?
$(iii)$ What are herbicides?

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