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 521· Soil fertility, manures and fertilisers· WAEC
Phosphorus deficiency in crops shows mainly as
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Answer: A. poor root growth and purplish leaves
Explanation and discussion
Question 522· Soil fertility, manures and fertilisers· JAMB
Rhizobium bacteria live in the root nodules of
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Answer: C. legumes
Explanation and discussion
Question 523· Soil fertility, manures and fertilisers· WAEC
NPK 15-15-15 contains
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Answer: A. equal proportions of nitrogen, phosphorus and potassium
Explanation and discussion
Question 524· Soil fertility, manures and fertilisers· WAEC
Nitrogen in fertilisers helps plants to
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Answer: C. produce healthy green leaves
Explanation and discussion
Question 525· Soil fertility, manures and fertilisers· JAMB
Which of these practices reduces soil fertility?
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Answer: B. Continuous cropping without fertiliser
Explanation and discussion
Question 526· Soil formation and properties· JAMB
Liming acidic soil helps by
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Answer: C. raising soil pH
Explanation and discussion
Question 527· Soil formation and properties· JAMB
A soil with pH 4.5 is
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Answer: D. strongly acidic
Explanation and discussion
Question 528· Soil formation and properties· JAMB
The soil water that plants can readily absorb is mainly
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Answer: C. capillary water
Explanation and discussion
Question 529· Soil formation and properties· JAMB
A soil profile is
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Answer: C. a vertical section showing the soil horizons
Explanation and discussion
Question 530· Soil formation and properties· JAMB
A soil pH of 5.0 shows that the soil is
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Answer: B. acidic
Explanation and discussion
Question 531· Soil formation and properties· JAMB
Which instrument is used to measure the pH of a soil sample?
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Answer: C. a pH meter
Explanation and discussion
Question 532· Soil formation and properties· WAEC
In a soil profile, the top layer rich in humus is the
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Answer: B. A horizon
Explanation and discussion
Question 533· Soil formation and properties· JAMB
Loamy soil is best for most crops because it
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Answer: D. has a good mixture of sand, silt and clay with humus
Explanation and discussion
Question 534· Soil formation and properties· WAEC
Which soil type has the largest particles?
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Answer: A. sandy soil
Explanation and discussion
Question 535· Soil formation and properties· WAEC
Which rock type forms from cooled magma and weathers to give the parent material of many soils?
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Answer: C. igneous rock
Explanation and discussion
Question 536· Soil formation and properties· JAMB
Which of these is NOT a factor of soil formation?
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Answer: D. crop yield
Explanation and discussion
Question 537· Soil formation and properties· WAEC
Soil texture can be estimated in the field by
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Answer: B. rubbing moist soil between the fingers
Explanation and discussion
Question 538· Soil formation and properties· WAEC
A soil with a pH of 4.5 is
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Answer: D. strongly acidic
Explanation and discussion
Question 539· Soil formation and properties· WAEC
Soil formed from the breakdown of rocks in its original place is
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Answer: D. residual soil
Explanation and discussion
Question 540· Soil formation and properties· WAEC
Clay soils hold a lot of water because they have
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Answer: A. very small particles and many tiny pores
Explanation and discussion

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JAMB and WAEC Agricultural Science questions

Phosphorus deficiency in crops shows mainly as

Rhizobium bacteria live in the root nodules of

NPK 15-15-15 contains

Nitrogen in fertilisers helps plants to

Which of these practices reduces soil fertility?

Liming acidic soil helps by

A soil with pH 4.5 is

The soil water that plants can readily absorb is mainly

A soil profile is

A soil pH of 5.0 shows that the soil is

Which instrument is used to measure the pH of a soil sample?

In a soil profile, the top layer rich in humus is the

Loamy soil is best for most crops because it

Which soil type has the largest particles?

Which rock type forms from cooled magma and weathers to give the parent material of many soils?

Which of these is NOT a factor of soil formation?

Soil texture can be estimated in the field by

A soil with a pH of 4.5 is

Soil formed from the breakdown of rocks in its original place is

Clay soils hold a lot of water because they have