JAMB and WAEC Agricultural Science questions

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

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

Question 581· Weeds and weed control· JAMB
Weeds that complete their life cycle in one season are
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Answer: C. annual weeds
Explanation and discussion
Question 582· Weeds and weed control· WAEC
Spear grass is difficult to control because it
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Answer: C. spreads by underground rhizomes
Explanation and discussion
Question 583· Weeds and weed control· WAEC
A herbicide that kills only certain kinds of plants is
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Answer: A. selective
Explanation and discussion
Question 584· Weeds and weed control· JAMB
A selective herbicide is one that
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Answer: A. kills certain plants without harming the crop
Explanation and discussion
Question 585· Weeds and weed control· JAMB
Spear grass (Imperata cylindrica) is difficult to control because it
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Answer: D. spreads by underground rhizomes
Explanation and discussion
Question 586· Weeds and weed control· JAMB
Weeds harm crops indirectly by serving as alternate hosts for
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Answer: B. pests and diseases
Explanation and discussion
Question 587· Weeds and weed control· JAMB
Weeds are harmful because they
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Answer: A. compete with crops and harbour pests
Explanation and discussion
Question 588· Weeds and weed control· WAEC
Weeds increase the cost of crop production because
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Answer: C. extra labour or chemicals are needed to control them
Explanation and discussion
Question 589· Weeds and weed control· JAMB
A weed is best defined as
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Answer: B. a plant growing where it is not wanted
Explanation and discussion
Question 590· Weeds and weed control· JAMB
A harmful effect of weeds on crops is that weeds
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Answer: A. compete with crops for light, water and nutrients
Explanation and discussion
Question 591· Weeds and weed control· WAEC
Guinea grass is regarded as a weed when it
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Answer: B. grows where it is not wanted in a crop field
Explanation and discussion
Question 592· Weeds and weed control· JAMB
Striga, a parasitic weed, attacks mainly
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Answer: C. cereals such as sorghum and maize
Explanation and discussion
Question 593· Weeds and weed control· JAMB
Water hyacinth is a troublesome weed of
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Answer: C. rivers and lakes
Explanation and discussion
Question 594· Weeds and weed control· WAEC
Using a cover crop such as Centrosema helps to
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Answer: B. suppress weeds and protect the soil
Explanation and discussion
Question 595· Weeds and weed control· WAEC
Striga (witchweed) is a parasitic weed of
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Answer: B. cereals such as sorghum and maize
Explanation and discussion
Question 596· Weeds and weed control· WAEC
Spear grass (Imperata cylindrica) is difficult to control mainly because it
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Answer: A. spreads by underground rhizomes
Explanation and discussion
Question 597· Weeds and weed control· JAMB
Pre-emergence herbicides are applied
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Answer: A. before the weeds or crop emerge
Explanation and discussion

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JAMB and WAEC Agricultural Science questions

Weeds that complete their life cycle in one season are

Spear grass is difficult to control because it

A herbicide that kills only certain kinds of plants is

A selective herbicide is one that

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

Weeds harm crops indirectly by serving as alternate hosts for

Weeds are harmful because they

Weeds increase the cost of crop production because

A weed is best defined as

A harmful effect of weeds on crops is that weeds

Guinea grass is regarded as a weed when it

Striga, a parasitic weed, attacks mainly

Water hyacinth is a troublesome weed of

Using a cover crop such as Centrosema helps to

Striga (witchweed) is a parasitic weed of

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

Pre-emergence herbicides are applied