JAMB Agricultural Science 2023 past questions

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

Ten questions from the 2023 JAMB Agricultural Science paper, with answers and explanations. We hold 39 questions from this paper, and the Skolra app has all of them.

JAMB Agricultural Science 2023 questions and answers

1. 1.

   Which of the following is a common by-product of farm animals?

   1. A
      Hides and skin
      Correct
   2. B
      Eggs
   3. C
      Meat
   4. D
      Milk
   Show answerHide answer

   Answer: A

   In agricultural science, farm animals give us primary (main) products and by-products. A by-product is something obtained as a secondary result of rearing the animal for its main purpose, not the main reason the animal is kept.

2. 2.

   What is the primary goal of crop improvement in agriculture?

   1. A
      To shorten the maturity period of all crops grown on the farm
   2. B
      To increase the yield and improve the quality of crop produce
      Correct
   3. C
      To reduce the cost of farm labour used in crop production
   4. D
      To develop crop varieties that are resistant to pests and diseases only
   Show answerHide answer

   Answer: B

   Crop improvement (plant breeding) is the deliberate application of genetic principles and selection to develop better crop varieties. Its primary goal is to increase yield and improve the quality of crop produce — that is, to get more and better food/raw material from the same land and effort.

3. 3.

   Farm animals can be classified into three main categories based on their primary purpose. Which of the following is NOT one of those categories?

   1. A
      Draught purposes
      Correct
   2. B
      Egg production
   3. C
      Milk production
   4. D
      Meat production
   Show answerHide answer

   Answer: A

   Farm animals are commonly classified by their primary product purpose into three main categories: meat production (e.g. beef cattle, pigs, broilers), milk production (e.g. dairy cattle, dairy goats), and egg production (e.g. layers).

4. 4.

   What is the term used to describe the deliberate modification of an organism's genetic material using biotechnology techniques?

   1. A
      Genetic engineering
      Correct
   2. B
      Genetic drift
   3. C
      Selective breeding
   4. D
      Hybridization
   Show answerHide answer

   Answer: A

   Genetic engineering is the correct term. It refers to the direct, deliberate alteration of an organism's genetic material (DNA) using biotechnology techniques such as gene splicing, recombinant DNA technology, or gene editing, to produce a desired trait.

5. 5.

   What does the scale of preference represent in agricultural decision-making?

   1. A
      The arrangement of a farmer's wants in order of importance because resources are limited
      Correct
   2. B
      The record of market prices of farm produce over a farming season
   3. C
      The full list of all inputs a farmer can possibly acquire
   4. D
      The comparison of yields obtained from different farm enterprises
   Show answerHide answer

   Answer: A

   The scale of preference is an economics concept every farmer applies. Because farm resources — land, capital, labour, time — are limited, but a farmer's wants (which crops to grow, which livestock to rear, which equipment to buy) are many, the farmer cannot satisfy every want at once.

6. 6.

   What is the process of introducing foreign genetic material into an organism called?

   1. A
      Hybridization
   2. B
      Selective breeding
   3. C
      Cloning
   4. D
      Genetic engineering
      Correct
   Show answerHide answer

   Answer: D

   Genetic engineering is correct. It is the direct, deliberate introduction of foreign genetic material (DNA/genes) from one organism into another, using biotechnology techniques, to give the recipient organism a new trait it did not originally have.

7. 7.

   What are some advantages of agricultural extension?

   1. A
      It directly eliminates pests and diseases on the farm
   2. B
      It provides farmers with low-interest loans to purchase farm equipment
   3. C
      It educates and helps farmers adopt improved techniques, increasing productivity and income
      Correct
   4. D
      It guarantees fixed government prices for farm produce
   Show answerHide answer

   Answer: C

   Agricultural extension is the advisory and educational service that links research findings from agricultural institutes to farmers in the field. Extension agents visit farmers, run demonstrations, and teach them new and improved methods of crop and livestock production.

8. 8.

   Which of the following is an example of farm machinery used for planting seeds?

   1. A
      Plough
   2. B
      Disc harrow
   3. C
      Seed drill
      Correct
   4. D
      Combine harvester
   Show answerHide answer

   Answer: C

   The seed drill is correct. It is the farm machine built specifically for planting — it opens a furrow, drops seeds at a set depth and spacing, and covers them, all in one pass.

9. 9.

   Which of the following is an example of a pasture commonly used in agriculture?

   1. A
      Cassava
   2. B
      Gmelina
   3. C
      Guinea grass
      Correct
   4. D
      Teak
   Show answerHide answer

   Answer: C

   Guinea grass (Panicum maximum) is correct. It is one of the commonly used pasture grasses in Nigerian agriculture, planted or naturally occurring on grazing land to feed livestock such as cattle, sheep and goats.

10. 10.

    Which part of a tractor is responsible for providing power to the attached implements or machinery?

    1. A
       Power take-off (PTO) shaft
       Correct
    2. B
       Drawbar
    3. C
       Hydraulic lift system
    4. D
       Differential
    Show answerHide answer

    Answer: A

    The correct answer is the power take-off (PTO) shaft. This is the rotating shaft at the rear (or sometimes front) of the tractor that draws power from the engine through the transmission and transmits it directly to attached implements such as ploughs, mowers, threshers, ridgers and sprayers, allowing them to be driven mechanically as the tractor works.

    So among the options, only the power take-off (PTO) shaft is designed specifically to supply operating power to attached implements or machinery.

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

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Practise all 39 questions we hold from the 2023 paper, on a timed CBT screen

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

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