WAEC Agricultural Science 2007 past questions

Checked by the Skolra question team · Last updated 23 October 2026

Ten questions from the 2007 WAEC Agricultural Science paper, with answers and explanations. We hold 52 questions from this paper, and the Skolra app has all of them.

WAEC Agricultural Science 2007 questions and answers

1. 1.Which of the following livestock diseases affects the reproductive system?
   1. A
      Brucellosis
      Correct
   2. B
      Foot-and-mouth disease
   3. C
      Newcastle disease
   4. D
      Anthrax
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   Answer: A

   Brucellosis is the correct answer. It is a bacterial disease of livestock (caused by Brucella abortus in cattle) that specifically attacks the reproductive system. In cows it causes abortion (usually in the last three months of pregnancy), retained placenta and reduced fertility; in bulls it causes swelling and inflammation of the testicles (orchitis). This is why it is also called "contagious abortion".

   So when a WAEC question asks for the disease linked to the reproductive system, think abortion and infertility in cattle — that points straight to brucellosis.

2. 2.I. Allowing land to fallow II. Applying organic fertilizer III. Practicing monoculture IV. Growing legumes. Which of the following combinations will help to improve soil fertility status?
   1. A
      I, III and IV only
   2. B
      I, II and IV only
      Correct
   3. C
      I, II and III only
   4. D
      II, III and IV only
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   Answer: B

   Allowing land to fallow, applying organic fertilizer and growing legumes are the three practices that improve soil fertility, so I, II and IV is correct.

3. 3.The most versatile source of farm power in West Africa is
   1. A
      Draught animals such as oxen and donkeys
   2. B
      Human (manual) labour
      Correct
   3. C
      The tractor and its attachments
   4. D
      Wind energy
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   Answer: B

   Human (manual) labour is the correct answer.

   So although tractors are more powerful and animals are cheaper to run for ploughing, only human labour can be applied to the full range of farm operations across all conditions - making it the most versatile.

4. 4.The eradication of mealy bugs is an effective control of
   1. A
      coffee berry disease
   2. B
      capsid damage on cocoa
   3. C
      black pod disease of cocoa
   4. D
      cocoa swollen shoot disease
      Correct
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   Answer: D

   Mealy bugs (e.g. Planococcoides njalensis) are the insect vectors that spread the virus causing cocoa swollen shoot disease from infected cocoa trees to healthy ones as they feed. Because the virus cannot move from tree to tree on its own, breaking the chain by eradicating the mealy bug vector is a recognised and effective cultural/biological control measure for this disease.

   So the correct link is: mealy bug eradication → breaks virus transmission → controls cocoa swollen shoot disease.

5. 5.Assuming that in sheep, the allele for black coat colour is dominant over that for brown coat colour. Crossing a heterzygote black with a homozygote brown will produce
   1. A
      All brown offspring
   2. B
      Offspring in the ratio of 1 black to 1 brown
      Correct
   3. C
      All black offspring
   4. D
      Offspring in the ratio of 3 black to 1 brown
   Show answerHide answer

   Answer: B

   Let B represent the allele for black coat colour (dominant) and b represent the allele for brown coat colour (recessive).

   The heterozygote black sheep has the genotype Bb, while the homozygote brown sheep has the genotype bb.

   Crossing them (a test cross): Bb × bb

   Gametes from Bb: B and b
   Gametes from bb: b and b

6. 6.Which of the following materials cannot be used for liming?
   1. A
      Calcium sulphate (gypsum)
      Correct
   2. B
      Calcium carbonate (limestone)
   3. C
      Calcium oxide (quicklime)
   4. D
      Calcium hydroxide (slaked lime)
   Show answerHide answer

   Answer: A

   Correct answer: Calcium sulphate (gypsum).

   Materials used for liming acid soils must be basic (alkaline) compounds of calcium (or calcium and magnesium) that can react with and neutralise the hydrogen ions causing soil acidity, thereby raising the soil pH.

7. 7.Delayed harvesting of maize may result in
   1. A
      Increase in the germination percentage of the harvested seeds
   2. B
      Reduction in the moisture content of the grains before storage
   3. C
      Loss of grains through shattering and attack by pests such as rodents, birds and weevils
      Correct
   4. D
      Reduction in pest and disease attack on the grains
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   Answer: C

   When maize is left standing in the field for too long after it has matured, the cobs and husks begin to loosen and the crop is exposed to the weather and to field pests for an extended period. This leads to shattering (grains dropping off the cob) and heavy attack by rodents, birds and weevils, which feed on the exposed, drying grains. This is the main reason farmers are advised to harvest maize promptly once it reaches physiological maturity.

   So the correct effect of delayed harvesting of maize is loss of grains through shattering and pest attack.

8. 8.I. Allowing land to fallow II. Applying organic fertilizer III. Practicing monoculture IV. Growing legumes. The spread of diseases and pests can be checked by
   1. A
      I and IV only
      Correct
   2. B
      III and IV only
   3. C
      I and II only
   4. D
      II and III only
   Show answerHide answer

   Answer: A

   Allowing land to fallow and growing legumes are both crop rotation practices, and crop rotation is the classic way of checking the spread of diseases and pests in agricultural science.

9. 9.Which of the following structures is not connected to the urethra of a bull?
   1. A
      Seminal vesicle
   2. B
      Epididymis
      Correct
   3. C
      Prostate gland
   4. D
      Vas deferens
   Show answerHide answer

   Answer: B

   In the male reproductive system of a bull, the urethra is the tube that carries both urine and semen, running from the bladder through the penis. Several accessory structures empty their contents directly into it along its course.

10. 10.When poultry flock, the birds keep passing out green, foul-smelling faeces with nervous symptoms, it means that the farmer
    1. A
       the flock has fowl typhoid
    2. B
       the flock has fowl pox
    3. C
       the flock has Newcastle disease
       Correct
    4. D
       the flock has coccidiosis
    Show answerHide answer

    Answer: C

    Newcastle disease is the correct answer because it is the poultry disease that produces exactly the two signs named in the question together: greenish, foul-smelling faeces and nervous symptoms (twisted neck, trembling, loss of balance, paralysis of the legs or wings). It is a highly contagious viral disease and this combination of droppings colour plus nervous signs is its classic field diagnosis.

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 52 questions we hold from the 2007 paper, on a timed CBT screen

Every question has the answer and an explanation, in the Skolra app.

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