JAMB Agricultural Science questions

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

1. Question 301· Weeds and weed control· JAMB

   Weeds are harmful because they

   • Acompete with crops and harbour pests
   • Bfix nitrogen
   • Cfeed humans
   • Dprotect soil only

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   Explanation and discussion

2. Question 302· Weeds and weed control· JAMB

   A weed is best defined as

   • Aany plant with thorns
   • Ba plant growing where it is not wanted
   • Ca crop grown for animal feed
   • Da poisonous plant

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3. Question 303· Weeds and weed control· JAMB

   A harmful effect of weeds on crops is that weeds

   • Acompete with crops for light, water and nutrients
   • Badd nitrogen to the soil
   • Calways increase yield
   • Dprevent erosion only

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   Explanation and discussion

4. Question 304· Weeds and weed control· JAMB

   Striga, a parasitic weed, attacks mainly

   • Aoil palm
   • Bcocoa
   • Ccereals such as sorghum and maize
   • Drubber

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   Explanation and discussion

5. Question 305· Weeds and weed control· JAMB

   Water hyacinth is a troublesome weed of

   • Adeserts
   • Bdry savanna
   • Crivers and lakes
   • Dforests

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   Explanation and discussion

6. Question 306· Weeds and weed control· JAMB

   Pre-emergence herbicides are applied

   • Abefore the weeds or crop emerge
   • Bafter harvesting
   • Con mature weeds only
   • Dto stored grain

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   Explanation and discussion