JAMB Agricultural Science 2025 past questions

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

Ten questions from the 2025 JAMB Agricultural Science paper, with answers and explanations. We hold 78 questions from this paper, and the Skolra app has all of them.

JAMB Agricultural Science 2025 questions and answers

1. 1.

   explains the female's reproductive organs of a flower in flowering plants

   1. A
      Stamen
   2. B
      Corolla
   3. C
      Calyx
   4. D
      Pistil
      Correct
   Show answerHide answer

   Answer: D

   The pistil (also called the gynoecium) is the term that explains the female reproductive organ of a flower in flowering plants. It is made up of the stigma, style and ovary, and it is the ovary that contains the ovules, which develop into seeds after fertilisation.

   So the correct term for the female reproductive organ of the flower is the pistil.

2. 2.

   ___ is a major reason why insects go to a flower.

   1. A
      To absorb sunlight for warmth
   2. B
      To lay their eggs in the soil nearby
   3. C
      To hide from predators
   4. D
      To collect nectar as food
      Correct
   Show answerHide answer

   Answer: D

   Insects visit flowers mainly to collect nectar, the sugary liquid produced by the flower as a source of food and energy. While doing this, pollen sticks to their bodies and is carried from flower to flower, which is how insects act as pollinating agents — but the insect's own motive for visiting is food (nectar), not pollination itself.

3. 3.

   What is the importance of crop rotation in sustainable agriculture?

   1. A
      It allows the same crop to be cultivated continuously on the same plot for higher yield
   2. B
      It removes the need for applying organic manure to the soil
   3. C
      It increases the rate of soil erosion on the cultivated land
   4. D
      It helps to prevent depletion of specific soil nutrients and reduces the build-up of pests and diseases
      Correct
   Show answerHide answer

   Answer: D

   Crop rotation means growing different types of crops, in a planned order, on the same piece of land over successive seasons instead of planting the same crop again and again.

4. 4.

   Which of the following mineral element is essential for chlorophyll formation?

   1. A
      Iron
   2. B
      Nitrogen
   3. C
      Magnesium
      Correct
   4. D
      Potassium
   Show answerHide answer

   Answer: C

   Magnesium is essential for chlorophyll formation because it forms the central atom of the chlorophyll molecule, sitting at the core of the porphyrin ring structure. Without magnesium, a plant cannot build chlorophyll at all, and this shows up as interveinal chlorolosis (yellowing between the veins) in the older leaves first.

5. 5.

   What is the role of a good seedbed in crop production?

   1. A
      It permanently improves soil fertility, removing the need for future fertilizer application
   2. B
      It provides a fine, loose tilth that ensures good seed-soil contact, proper aeration and drainage for uniform germination and healthy root growth
      Correct
   3. C
      It increases the market value of the crop by improving the appearance of the produce
   4. D
      It guarantees adequate rainfall throughout the growing season, eliminating the need for irrigation
   Show answerHide answer

   Answer: B

   A good seedbed is prepared to give germinating seeds the best possible start. It is worked into a fine, loose tilth so that seeds make close contact with moist soil, air can reach the germinating seed and roots, and excess water drains away instead of waterlogging the young roots. This is why a well-prepared seedbed gives uniform, healthy germination and vigorous early root and seedling growth.

6. 6.

   the restriction of farm animals with rope to a peg is known as

   1. A
      Herding
   2. B
      Tethering
      Correct
   3. C
      Paddocking
   4. D
      Penning
   Show answerHide answer

   Answer: B

   Tethering is the system of restricting farm animals by tying them with a rope to a peg or stake driven into the ground, so the animal can only graze within the length of the rope. It is a common low-cost method of controlling grazing animals like goats, sheep and cattle in Nigerian mixed farming.

7. 7.

   A farmer who applies gypsum on his farmland intends to

   1. A
      kill harmful soil organisms
   2. B
      reclaim the soil and improve its structure
      Correct
   3. C
      increase the nitrogen content of the soil
   4. D
      reduce the acidity of the soil
   Show answerHide answer

   Answer: B

   Gypsum is calcium sulphate (CaSO₄). Unlike agricultural lime, gypsum is roughly neutral in pH, so it does not act as a strong soil acidity corrector; that is the job of lime.

8. 8.

   The vector for nagana disease in cattle is

   1. A
      Housefly
   2. B
      Mosquito
   3. C
      Tick
   4. D
      Tsetse fly
      Correct
   Show answerHide answer

   Answer: D

   Nagana is a trypanosomiasis disease of cattle (and other livestock) caused by protozoan parasites of the genus Trypanosoma. It is spread by the bite of the tsetse fly (genus Glossina), which picks up the trypanosomes when it feeds on an infected animal and injects them into the next animal it bites.

9. 9.

   The essential mineral element necessary for chlorophyll formation is

   1. A
      Nitrogen
   2. B
      Iron
   3. C
      Potassium
   4. D
      Magnesium
      Correct
   Show answerHide answer

   Answer: D

   Magnesium is the mineral element at the centre of every chlorophyll molecule. Just as iron sits at the centre of haemoglobin in blood, magnesium forms the core atom of the porphyrin ring in chlorophyll, and without it the plant cannot build the pigment at all — this is why magnesium-deficient plants show interveinal yellowing (chlorosis).

10. 10.

    The sand, silt, and clayey particles of the soil are cemented together in the soil to form natural units of compound aggregates separated by pores. This process is called

    1. A
       Soil structure
       Correct
    2. B
       Soil consistency
    3. C
       Soil profile
    4. D
       Soil texture
    Show answerHide answer

    Answer: A

    Soil structure is correct. Soil structure is the term used for the way individual sand, silt and clay particles are bound or cemented together (by substances like humus, clay, iron oxides and calcium) into larger natural units called peds or aggregates, with pore spaces separating them. This arrangement affects aeration, drainage, root penetration and water-holding capacity.

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 78 questions we hold from the 2025 paper, on a timed CBT screen

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

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