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JAMB and WAEC Agricultural Science questions: Weeds and weed control

33 questions with answers and explanations. Tap an option to check yourself.

AllJAMBWAEC
All topicsAgricultural economics and extension · 41Animal pests and diseases · 38Animal reproduction and nutrition · 38Classification and anatomy of farm animals · 37Crop classification and propagation · 36Crop pests and diseases · 39Farm tools and mechanisation · 35Fisheries and aquaculture · 35Forestry · 33Husbandry of field crops · 41Irrigation and drainage · 36Livestock management · 37Meaning and importance of agriculture · 36Soil fertility, manures and fertilisers · 43Soil formation and properties · 39Weeds and weed control · 33

  1. Question 1· Weeds and weed control· WAEC

    Water hyacinth is a weed problem mainly in

    Explanation and discussion

  2. Question 2· Weeds and weed control· WAEC

    Which is a cultural method of weed control?

    Explanation and discussion

  3. Question 3· Weeds and weed control· WAEC

    Weeds reduce crop yield mainly by

    Explanation and discussion

  4. Question 4· Weeds and weed control· WAEC

    A herbicide that kills only certain plants and leaves the crop unharmed is

    Explanation and discussion

  5. Question 5· Weeds and weed control· WAEC

    Seeds of many weeds remain viable in the soil for a long time because of

    Explanation and discussion

  6. Question 6· Weeds and weed control· WAEC

    Paraquat is a

    Explanation and discussion

  7. Question 7· Weeds and weed control· WAEC

    Striga (witchweed) harms sorghum and maize by

    Explanation and discussion

  8. Question 8· Weeds and weed control· JAMB

    Striga (witchweed) is a weed that

    Explanation and discussion

  9. Question 9· Weeds and weed control· WAEC

    A weed is best described as

    Explanation and discussion

  10. Question 10· Weeds and weed control· WAEC

    A useful feature of some weeds is that they

    Explanation and discussion

  11. Question 11· Weeds and weed control· JAMB

    A herbicide applied to the soil before the crop or weeds emerge is a

    Explanation and discussion

  12. Question 12· Weeds and weed control· WAEC

    Which of these is a cultural method of weed control?

    Explanation and discussion

  13. Question 13· Weeds and weed control· JAMB

    Post-emergence herbicides are applied

    Explanation and discussion

  14. Question 14· Weeds and weed control· WAEC

    Some weeds reduce crop quality at harvest by

    Explanation and discussion

  15. Question 15· Weeds and weed control· JAMB

    Herbicides that kill some plants but leave others unharmed are

    Explanation and discussion

  16. Question 16· Weeds and weed control· JAMB

    Which of these is a mechanical method of weed control?

    Explanation and discussion

  17. Question 17· Weeds and weed control· JAMB

    Weeds that complete their life cycle in one season are

    Explanation and discussion

  18. Question 18· Weeds and weed control· WAEC

    Spear grass is difficult to control because it

    Explanation and discussion

  19. Question 19· Weeds and weed control· WAEC

    A herbicide that kills only certain kinds of plants is

    Explanation and discussion

  20. Question 20· Weeds and weed control· JAMB

    A selective herbicide is one that

    Explanation and discussion

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