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 501· Soil fertility, manures and fertilisers· WAEC
The bacteria in the root nodules of legumes that fix nitrogen belong to the genus
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Answer: C. Rhizobium
Explanation and discussion
Question 502· Soil fertility, manures and fertilisers· JAMB
The nutrient mostly responsible for vigorous leafy, green growth in crops is
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Answer: A. nitrogen
Explanation and discussion
Question 503· Soil fertility, manures and fertilisers· WAEC
Crop rotation helps to maintain soil fertility by
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Answer: B. growing crops with different nutrient needs in sequence
Explanation and discussion
Question 504· Soil fertility, manures and fertilisers· WAEC
Leaching reduces soil fertility by
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Answer: C. washing nutrients down beyond the reach of roots
Explanation and discussion
Question 505· Soil fertility, manures and fertilisers· JAMB
An NPK fertiliser labelled 20:10:10 contains
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Answer: A. 20% nitrogen, 10% P₂O₅ and 10% K₂O
Explanation and discussion
Question 506· Soil fertility, manures and fertilisers· JAMB
The conversion of ammonium compounds to nitrates by soil bacteria is
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Answer: A. nitrification
Explanation and discussion
Question 507· Soil fertility, manures and fertilisers· JAMB
Leguminous crops improve soil fertility by
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Answer: B. fixing atmospheric nitrogen through root nodule bacteria
Explanation and discussion
Question 508· Soil fertility, manures and fertilisers· JAMB
Leaching is the
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Answer: C. washing down of soluble nutrients below the root zone
Explanation and discussion
Question 509· Soil fertility, manures and fertilisers· WAEC
Which practice helps to maintain soil fertility?
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Answer: C. crop rotation that includes legumes
Explanation and discussion
Question 510· Soil fertility, manures and fertilisers· JAMB
Phosphorus is needed by crops mainly for
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Answer: B. root development and seed formation
Explanation and discussion
Question 511· Soil fertility, manures and fertilisers· WAEC
A farmer applies 100 kg of NPK 15-15-15 fertiliser. How much nitrogen does it supply?
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Answer: D. 15 kg
Explanation and discussion
Question 512· Soil fertility, manures and fertilisers· JAMB
Deficiency of nitrogen in crops is shown by
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Answer: B. yellowing of older leaves and stunted growth
Explanation and discussion
Question 513· Soil fertility, manures and fertilisers· JAMB
Potassium deficiency in plants is shown by
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Answer: D. scorching of leaf margins
Explanation and discussion
Question 514· Soil fertility, manures and fertilisers· WAEC
Adding lime to an acidic soil raises its
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Answer: C. pH
Explanation and discussion
Question 515· Soil fertility, manures and fertilisers· JAMB
Potassium deficiency in crops shows mainly as
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Answer: A. scorching of leaf margins
Explanation and discussion
Question 516· Soil fertility, manures and fertilisers· WAEC
Muriate of potash supplies
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Answer: A. potassium
Explanation and discussion
Question 517· Soil fertility, manures and fertilisers· JAMB
Which of these fertilisers supplies only nitrogen?
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Answer: B. urea
Explanation and discussion
Question 518· Soil fertility, manures and fertilisers· WAEC
Yellowing of older leaves (chlorosis) is a sign of
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Answer: C. nitrogen deficiency
Explanation and discussion
Question 519· Soil fertility, manures and fertilisers· JAMB
Which of these elements is a micronutrient?
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Answer: A. zinc
Explanation and discussion
Question 520· Soil fertility, manures and fertilisers· JAMB
Yellowing of the older leaves of maize most likely shows a shortage of
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Answer: D. nitrogen
Explanation and discussion

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JAMB and WAEC Agricultural Science questions

The bacteria in the root nodules of legumes that fix nitrogen belong to the genus

The nutrient mostly responsible for vigorous leafy, green growth in crops is

Crop rotation helps to maintain soil fertility by

Leaching reduces soil fertility by

An NPK fertiliser labelled 20:10:10 contains

The conversion of ammonium compounds to nitrates by soil bacteria is

Leguminous crops improve soil fertility by

Leaching is the

Which practice helps to maintain soil fertility?

Phosphorus is needed by crops mainly for

A farmer applies 100 kg of NPK 15-15-15 fertiliser. How much nitrogen does it supply?

Deficiency of nitrogen in crops is shown by

Potassium deficiency in plants is shown by

Adding lime to an acidic soil raises its

Potassium deficiency in crops shows mainly as

Muriate of potash supplies

Which of these fertilisers supplies only nitrogen?

Yellowing of older leaves (chlorosis) is a sign of

Which of these elements is a micronutrient?

Yellowing of the older leaves of maize most likely shows a shortage of