JAMB Agricultural Science 2024 past questions
Ten questions from the 2024 JAMB Agricultural Science paper, with answers and explanations. We hold 31 questions from this paper, and the Skolra app has all of them.
JAMB Agricultural Science 2024 questions and answers
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1.
In the nitrogen cycle , nitrite is oxidized to nitrate by
- AAzotobacter
- BRhizobium
- CNitrosomonas
- DNitrobacterCorrect
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Answer: D
In the nitrogen cycle, nitrification happens in two stages carried out by two different bacteria, and candidates often mix them up.
So the correct organism for turning nitrite into nitrate is Nitrobacter.
- A
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2.
One of the peculiarities of the intestine tract of a fowl is the possession of
- AA pair of caeca (blind pouches)Correct
- BA crop for storing feed
- CA gizzard for grinding feed
- DA proventriculus for enzyme secretion
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Answer: A
A pair of caeca (blind pouches) is correct. In the fowl, at the point where the small intestine joins the large intestine (rectum), there are two blind sac-like outgrowths called caeca. This paired caeca is a peculiar feature of the fowl's intestinal tract and helps in the digestion of fibrous material and absorption of water.
- A
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3.
Which of the following soil water is tightly held to the surface of the soil particles?
- AFree water
- BHygroscopic waterCorrect
- CGravitational water
- DCapillary water
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Answer: B
Hygroscopic water is correct. It is the thin film of water that is tightly and firmly held to the surface of soil particles by adhesive forces. It is held so strongly that plant roots cannot absorb it, and it can only be removed from the soil by oven-drying at high temperature.
- A
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4.
Which of the following livestock endoparasite is a hermaphmdite?
- ACoccidia
- BLiver flukeCorrect
- CRoundworm
- DHookworm
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Answer: B
A hermaphrodite is an organism that has both male and female reproductive organs in the same individual, so it can produce both sperm and eggs and can even fertilise itself.
So the correct answer is the liver fluke.
- A
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5.
Which of the following processes will not lead to the loss of nutrients from the soil?
- AContinuous bush burning
- BLeaching of soluble nutrients
- CMulching of the soil surfaceCorrect
- DErosion by run-off water
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Answer: C
Mulching is the process that will not lead to loss of nutrients from the soil. Mulch (dead grass, straw, plastic sheeting, etc.) covers the soil surface, reduces the impact of rain drops, keeps the soil cool and moist, controls weeds, and slows down the rate at which water moves through the soil. In doing all this, it actually helps to conserve soil nutrients rather than remove them.
- A
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6.
The roles of government in the development of agriculture include the following except
- AProvision of extension services to educate farmers
- BProvision of agricultural credit facilities to farmers
- CEngaging directly in commercial farming for personal profitCorrect
- DEstablishment of agricultural research institutes
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Answer: C
Government supports and directs agricultural development mainly through facilitation, not by running farms for its own private gain.
- A
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7.
Financial assistance from the government to the farmers is usually in the following forms except
- ATaxationCorrect
- BSubsidies
- CLoans
- DGrants
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Answer: A
Government support to farmers usually comes as loans (low-interest credit to buy inputs or equipment), subsidies (government pays part of the cost of fertilizer, seedlings, or machinery so farmers pay less), and grants (money given outright, without repayment, often under agricultural intervention schemes).
- A
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8.
Which of the following group of crops can be attacked by smut diseases?
- ACitrus, mango and pawpaw
- BCassava, yam and cocoyam
- CMaize, guinea corn and milletCorrect
- DCowpea, groundnut and soyabean
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Answer: C
Smut disease is a fungal disease (caused by Ustilago and related fungi) that mainly attacks cereal crops. This is why maize, guinea corn (sorghum) and millet are the group commonly affected by smut, since they are all cereals belonging to the grass family.
- A
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9.
Which of the following will not lead to loss of nitrogen compound from the soil?
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- ANitrogen fixation by Rhizobium bacteria in the root nodules of legumesCorrect
- BBurning of crop residue after harvest
- CDenitrification by soil bacteria under waterlogged conditions
- DLeaching of nitrates by heavy rainfall
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Answer: A
Nitrogen fixation by Rhizobium bacteria in the root nodules of legumes does not lead to loss of nitrogen compound from the soil — it does the opposite. These bacteria, living in symbiosis with leguminous plants such as beans, cowpea and groundnut, convert atmospheric nitrogen gas (N₂) into nitrogen compounds (ammonium/nitrate) that enrich the soil. This is why legumes are used in crop rotation, to restore soil nitrogen.
- A
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10.
The correct sequence of the components of a goat's stomach is
- ARumen, Reticulum, Omasum, AbomasumCorrect
- BReticulum, Rumen, Omasum, Abomasum
- CRumen, Omasum, Reticulum, Abomasum
- DReticulum, Rumen, Abomasum, Omasum
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Answer: A
A goat is a ruminant, and its stomach has four compartments that food passes through in a fixed order: rumen, reticulum, omasum, then abomasum.
- A
The questions come from past JAMB, WAEC and NECO papers. We use software to help write the answer options and explanations, and every answer is checked twice before it goes on the site. How we check
Spotted a wrong answer? Tell us from the app or on the contact page and we check it.
Practise all 31 questions we hold from the 2024 paper, on a timed CBT screen
Every question has the answer and an explanation, in the Skolra app.