question_answer 31)

  Weeds affect the crop plants by (a) killing of plants in field before they grow        (b) dominating the plants to grow (c) competing for various resources of crops (plants) causing low availability or nutrients (d) AII of the above

Answer:

  (d) Weeds are unwanted plants in the cultivated fields. They compete with main crop plants for nutrients and reduce the growth of crops in many ways. The seeds of weed germinate easily, their seedlings grow faster, they flower early, their seed production begins after a very short growth period and produce many seeds.