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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 21· Weeds and weed control· JAMB

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

    Explanation and discussion

  2. Question 22· Weeds and weed control· JAMB

    Weeds harm crops indirectly by serving as alternate hosts for

    Explanation and discussion

  3. Question 23· Weeds and weed control· JAMB

    Weeds are harmful because they

    Explanation and discussion

  4. Question 24· Weeds and weed control· WAEC

    Weeds increase the cost of crop production because

    Explanation and discussion

  5. Question 25· Weeds and weed control· JAMB

    A weed is best defined as

    Explanation and discussion

  6. Question 26· Weeds and weed control· JAMB

    A harmful effect of weeds on crops is that weeds

    Explanation and discussion

  7. Question 27· Weeds and weed control· WAEC

    Guinea grass is regarded as a weed when it

    Explanation and discussion

  8. Question 28· Weeds and weed control· JAMB

    Striga, a parasitic weed, attacks mainly

    Explanation and discussion

  9. Question 29· Weeds and weed control· JAMB

    Water hyacinth is a troublesome weed of

    Explanation and discussion

  10. Question 30· Weeds and weed control· WAEC

    Using a cover crop such as Centrosema helps to

    Explanation and discussion

  11. Question 31· Weeds and weed control· WAEC

    Striga (witchweed) is a parasitic weed of

    Explanation and discussion

  12. Question 32· Weeds and weed control· WAEC

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

    Explanation and discussion

  13. Question 33· Weeds and weed control· JAMB

    Pre-emergence herbicides are applied

    Explanation and discussion

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