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JAMB Agricultural Science questions: Weeds and weed control

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

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All topicsAgricultural economics and extension · 22Animal pests and diseases · 20Animal reproduction and nutrition · 20Classification and anatomy of farm animals · 19Crop classification and propagation · 18Crop pests and diseases · 20Farm tools and mechanisation · 17Fisheries and aquaculture · 17Forestry · 15Husbandry of field crops · 22Irrigation and drainage · 18Livestock management · 19Meaning and importance of agriculture · 19Soil fertility, manures and fertilisers · 24Soil formation and properties · 21Weeds and weed control · 15

  1. Question 1· Weeds and weed control· JAMB

    Striga (witchweed) is a weed that

    Explanation and discussion

  2. Question 2· Weeds and weed control· JAMB

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

    Explanation and discussion

  3. Question 3· Weeds and weed control· JAMB

    Post-emergence herbicides are applied

    Explanation and discussion

  4. Question 4· Weeds and weed control· JAMB

    Herbicides that kill some plants but leave others unharmed are

    Explanation and discussion

  5. Question 5· Weeds and weed control· JAMB

    Which of these is a mechanical method of weed control?

    Explanation and discussion

  6. Question 6· Weeds and weed control· JAMB

    Weeds that complete their life cycle in one season are

    Explanation and discussion

  7. Question 7· Weeds and weed control· JAMB

    A selective herbicide is one that

    Explanation and discussion

  8. Question 8· Weeds and weed control· JAMB

    Spear grass (Imperata cylindrica) is difficult to control because it

    Explanation and discussion

  9. Question 9· Weeds and weed control· JAMB

    Weeds harm crops indirectly by serving as alternate hosts for

    Explanation and discussion

  10. Question 10· Weeds and weed control· JAMB

    Weeds are harmful because they

    Explanation and discussion

  11. Question 11· Weeds and weed control· JAMB

    A weed is best defined as

    Explanation and discussion

  12. Question 12· Weeds and weed control· JAMB

    A harmful effect of weeds on crops is that weeds

    Explanation and discussion

  13. Question 13· Weeds and weed control· JAMB

    Striga, a parasitic weed, attacks mainly

    Explanation and discussion

  14. Question 14· Weeds and weed control· JAMB

    Water hyacinth is a troublesome weed of

    Explanation and discussion

  15. Question 15· Weeds and weed control· JAMB

    Pre-emergence herbicides are applied

    Explanation and discussion

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