JAMB UTME - Agricultural Science - 2025

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The hormone responsible for the development of female secondary sex characteristics in farm animals is oestrogen (also spelled estrogen). Oestrogen is produced mainly by the ovaries (specifically the Graafian follicles) and is responsible for:

• Development of the mammary glands (udder development)
• Widening of the pelvic region
• Fat deposition in characteristic female patterns
• Development of the female reproductive tract
• Expression of oestrus (heat) behaviour

The other hormones have different roles:

• Progesterone is produced by the corpus luteum after ovulation. Its primary function is to prepare and maintain the uterus for pregnancy, not to develop secondary sex characteristics.
• Testosterone is the male sex hormone responsible for male secondary sex characteristics such as muscular development, aggression, and libido in males.
• Relaxin is a hormone produced during late pregnancy that relaxes the pelvic ligaments and softens the cervix to facilitate parturition (birth).

Exam tip: Oestrogen = female secondary sex characteristics and heat behaviour. Progesterone = pregnancy maintenance. Testosterone = male traits. Relaxin = birth preparation.

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The main difference between organic and inorganic fertilizers lies in their origin. Organic fertilizers are derived from natural sources - decomposed plant matter, animal manure, compost, bone meal, fish meal, and other biological materials. Inorganic (mineral or synthetic) fertilizers are manufactured through industrial chemical processes, such as the Haber-Bosch process for producing ammonium-based nitrogen fertilizers or the treatment of phosphate rock with acid to produce superphosphate.

The other options contain inaccuracies:

• Inorganic fertilizers are generally more polluting than organic fertilizers, not less. They are a major source of water pollution (eutrophication) and can degrade soil structure over time with excessive use.
• Organic fertilizers are not necessarily more readily available than inorganic fertilizers. In fact, inorganic fertilizers are often easier to obtain commercially, especially in urban areas.
• The claim that organic fertilizers provide only micronutrients while inorganic fertilizers provide only macronutrients is incorrect. Organic fertilizers supply both macro- and micronutrients (albeit in lower, slower-release concentrations), and inorganic fertilizers can be formulated to include micronutrients as well.

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A good seedbed provides a suitable environment for seed germination and early seedling growth. Seedbed preparation involves tilling, levelling, and refining the soil so that it has the right tilth (fine, crumbly texture), adequate moisture, proper aeration, and good soil-to-seed contact. These conditions allow seeds to absorb water (imbibition), germinate, and establish strong root systems during the critical early growth stage.

The other three options describe outcomes that a good seedbed is specifically designed to prevent:

• Promoting excessive weed growth would defeat the purpose of seedbed preparation, which includes clearing weeds and creating conditions that favour the planted crop over competitors.
• Encouraging soil compaction is the opposite of what tillage achieves. Compacted soil restricts root penetration, reduces water infiltration, and limits air circulation.
• Hindering root development contradicts the goal of creating loose, well-aerated soil that allows roots to spread freely and access water and nutrients.

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Terracing is a soil conservation method in which a hillside is reshaped into a series of broad, flat steps (terraces) separated by risers. Each terrace reduces the slope length and steepness, which slows down the speed of surface runoff during rain. Slower runoff has less erosive energy, so less topsoil is carried away. Water also has more time to infiltrate the soil on each level step, improving moisture availability for crops.

The other three options are actually causes of soil degradation, not conservation methods:

• Monoculture (continuously growing the same crop on the same land) depletes specific nutrients and can weaken soil structure over time.
• Deforestation removes trees and their root networks, which bind the soil and absorb rainfall impact. Bare, deforested land is highly vulnerable to erosion by both water and wind.
• Overgrazing occurs when livestock consume vegetation faster than it can regrow, leaving the soil exposed to the full force of rain and wind erosion.

Other soil conservation methods include contour ploughing, strip cropping, cover cropping, mulching, and the construction of windbreaks.

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After heavy rainfall, soil pore spaces fill with water. The excess water that responds freely to gravity drains downward - this is gravitational water, and it is the first to leave. Once gravitational water has drained away, the water that remains held in the smaller pore spaces by surface tension and capillary forces is called capillary water. This is the water that plant roots can actually absorb, and it is therefore the type that is "available to crop plants."

The other terms describe different categories of soil water:

• Field capacity describes the state of the soil (its moisture content) once gravitational water has drained, not a type of water. At field capacity the soil holds the maximum amount of capillary water.
• Hygroscopic water is a very thin film of water tightly adsorbed onto the surface of soil particles by molecular forces. It is held so tightly that plant roots cannot extract it, so it is not available to crops.
• Gravitational water is the excess water that drains freely under gravity. Far from being the water that stays, it is precisely the water that leaves.

Examination tip: Remember the availability sequence - gravitational water drains away, capillary water is available to plants, and hygroscopic water is unavailable.

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Transplanting seedlings requires a tool that can dig a small, precise hole, gently lift the seedling with its root ball intact, and place it carefully into the new position. A hand trowel is ideally suited for this task because of its small, scoop-shaped blade that allows controlled digging at the shallow depths seedlings need.

A shovel is too large and heavy for delicate seedling work; it would disturb the surrounding soil excessively and risks damaging fragile roots. A hand fork is designed for loosening and aerating soil or lifting weeds, not for digging planting holes. A go-to-hell (a flat-bladed, long-handled weeding tool used in West African agriculture) is meant for scraping weeds from the soil surface and is far too aggressive for seedling transplanting.

Examination tip: When questions ask for the "best" tool for a specific farm operation, match the tool's size and blade shape to the precision and depth the task requires.

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Cereal crops are members of the grass family (Poaceae/Gramineae) cultivated primarily for their starchy, edible grains. Common examples include rice, maize (corn), millet, wheat, sorghum, barley, and oats.

Cowpea (Vigna unguiculata) is not a cereal. It belongs to the legume family (Fabaceae/Leguminosae). Legumes are dicotyledonous plants that produce seeds in pods and are cultivated mainly for their high protein content. Cowpea is also notable for its ability to fix atmospheric nitrogen through symbiotic bacteria (Rhizobium) in its root nodules.

Rice (Oryza sativa), maize (Zea mays), and millet (Pennisetum glaucum and related species) are all true cereals - monocotyledonous grasses that produce grain as their primary harvest product.

Exam tip: To distinguish cereals from legumes, remember that cereals are grasses (monocots) grown for carbohydrate-rich grains, while legumes are pod-bearing plants (dicots) grown for protein-rich seeds. Cowpea, groundnut, soybean, and beans are legumes, not cereals.

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An incubator is a device used in poultry farming to hatch eggs artificially. It replicates the conditions that a brooding hen provides naturally by maintaining a controlled temperature (typically around 37.5-37.8 degrees Celsius for chicken eggs), appropriate humidity (around 50-65%), adequate ventilation, and regular turning of the eggs throughout the incubation period (21 days for chickens).

Incubators allow farmers to hatch large numbers of eggs simultaneously without relying on broody hens, making poultry production more efficient and scalable.

The other options confuse the incubator with other equipment or functions:

• Storing eggs is not the purpose of an incubator. Eggs for storage are kept in cool conditions to preserve them, not in the warm environment of an incubator.
• Providing heat for chicks describes the function of a brooder, which is used after hatching to keep newly hatched chicks warm during their first few weeks of life.
• Stimulating chick growth is achieved through proper nutrition and management, not through any single piece of equipment like an incubator.

Exam tip: Incubator = hatching eggs; Brooder = warming chicks after hatching. These are two distinct pieces of poultry equipment with different functions.

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Magnesium (Mg) is the mineral element at the heart of every chlorophyll molecule. The chlorophyll molecule consists of a porphyrin ring with a single magnesium atom chelated at its centre. Without an adequate supply of magnesium, the plant cannot synthesise chlorophyll, and the leaves develop interveinal chlorosis - the tissue between the veins turns yellow while the veins themselves remain green, starting with the older leaves because magnesium is mobile and is redirected to younger growth.

The other elements listed play different roles:

• Molybdenum (Mo) is a trace element needed by the enzyme nitrate reductase, which converts nitrate to ammonium in nitrogen metabolism.
• Sodium (Na) is not essential for most higher plants; only a few species (mainly C₄ and CAM plants) have a limited requirement for it.
• Boron (B) is a micronutrient important for cell wall formation, pollen tube growth, and sugar transport.

Examination tip: Whenever a question links a mineral element to chlorophyll, the answer is magnesium. Iron is also needed for chlorophyll synthesis (as a cofactor in the biosynthetic pathway), but magnesium is the element that is structurally part of the chlorophyll molecule itself.

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Sleeping sickness in farm animals (also called nagana in cattle) is caused by a trypanosome - a flagellated protozoan parasite of the genus Trypanosoma. The most common species affecting livestock in sub-Saharan Africa are Trypanosoma congolense, Trypanosoma vivax, and Trypanosoma brucei brucei. The parasite lives in the blood and tissue fluids of the host and is transmitted by the bite of the tsetse fly (Glossina species).

The option "transmitted by trypanosomiasis" is linguistically and scientifically incorrect. Trypanosomiasis is the name of the disease itself (the condition caused by trypanosomes); a disease cannot transmit itself. The correct statement would be "transmitted by the tsetse fly" or "caused by a trypanosome."

Brucellosis is an entirely different disease caused by bacteria of the genus Brucella, leading to abortion and infertility in cattle, goats, and pigs. Coccidiosis is caused by protozoan parasites of the genus Eimeria (coccidia), which infect the intestinal lining, primarily in poultry and young ruminants.

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Taungya farming is an agroforestry system that combines crop husbandry and forestry. In this system, food crops are cultivated alongside newly planted tree seedlings in a forest plantation. Farmers are permitted to grow arable crops (such as maize, cassava, or vegetables) between the rows of young trees until the tree canopy closes and shades out the crops, usually after two to three years.

The system originated in Myanmar (Burma) and was adopted in West Africa and other tropical regions. It benefits both parties: the forestry department gets its plantation established and maintained at lower cost (since farmers weed and tend the area while growing their crops), and farmers gain access to land and earn income from their harvests.

Taungya does not involve hunting or animal husbandry. It is strictly a crop-tree integration system. The combination of crop husbandry and animal husbandry describes mixed farming, not taungya.

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The physical appearance of soil as determined by the arrangement of individual soil particles into aggregates or clumps is called soil structure. Soil structure describes how sand, silt, and clay particles are grouped together into larger units called peds or aggregates, and the pattern of pore spaces between them.

Common soil structure types include granular (rounded aggregates, common in topsoil), blocky (angular or sub-angular blocks), prismatic (vertical columns), platy (horizontal plates), and single-grained or massive (no aggregation).

The other terms refer to different soil properties:

• Soil texture refers to the relative proportions of sand, silt, and clay particles in a soil sample - it describes particle size distribution, not how those particles are arranged.
• Capillarity is the ability of water to move upward through narrow pore spaces in the soil against gravity. It is a property related to water movement, not the arrangement of particles.
• Soil type is a general classification term and does not specifically describe the arrangement of particles.

Exam tip: Texture = what sizes of particles are present; Structure = how those particles are arranged. Both affect water retention, aeration, and root penetration, but they describe different physical attributes of the soil.

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The first operation in establishing a fish pond is clearing and stumping of the site. Before any construction work can begin, the selected site must be cleared of vegetation (trees, shrubs, grasses) and all tree stumps must be removed. This provides a clean, level working area and ensures that decaying organic material does not later contaminate the pond water or compromise the structural integrity of the pond walls.

The correct sequence for establishing a fish pond typically follows this order:

1. Site selection and surveying
2. Clearing and stumping of the site
3. Excavation and construction of the pond (including dam/dyke construction)
4. Construction of the spillway (overflow structure) and inlet/outlet
5. Liming and fertilisation of the pond bottom
6. Filling with water
7. Purchase and stocking of fingerlings

Dam construction, spillway construction, and purchase of fingerlings are all important steps, but none of them can proceed until the site has been properly cleared and prepared. Attempting to construct earthen walls or water control structures on an uncleared site would result in weak, unstable structures prone to leakage and collapse.

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Tethering is the practice of restraining a farm animal by fastening it with a rope or chain to a fixed point such as a peg, stake, or post driven into the ground. The animal can graze within the radius allowed by the length of the rope, and the peg is moved periodically to give the animal access to fresh pasture.

Tagging is the attachment of numbered or coded tags (usually to the ear) for identification purposes. Tattooing is a permanent identification method in which ink is stamped into the skin, commonly on the inner ear. "Tieing" (tying) is a general English word for fastening with a knot, but the specific agricultural term for anchoring an animal to a peg for controlled grazing is tethering.

Tethering is commonly used for goats, sheep, and cattle in smallholder farming systems where fenced pastures are unavailable. It allows the farmer to control where and how much the animal grazes.

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Drainage is the process of removing excess water from agricultural land, either through natural channels or through artificial structures such as open ditches, subsurface pipes, or tile drains. Proper drainage prevents waterlogging, which can suffocate plant roots by cutting off their oxygen supply.

Percolation is the downward movement of water through soil pore spaces under the influence of gravity. It is a natural physical process, not a deliberate removal technique. Infiltration is the entry of water from the soil surface into the soil profile - the first stage of water entering the ground. Dredging is the excavation of sediment from the bottom of rivers, harbours, or canals; it is a water-body maintenance operation, not a farmland water-removal practice.

Examination tip: Keep the sequence clear - rainwater first infiltrates the surface, then percolates downward through the profile, and if the soil becomes saturated, drainage is needed to remove the excess.

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Culling is the permanent removal of unproductive, undesirable, or substandard animals from a herd or flock. An animal is culled when it consistently fails to meet production targets - for example, a cow with persistently low milk yield, a hen that has stopped laying, or a breeding animal that is infertile. Culled animals are typically sold for slaughter rather than returned to the herd.

The other options describe temporary separation rather than permanent removal:

• Isolation is the temporary separation of a sick animal from healthy stock to prevent disease spread while the animal is treated.
• Confinement means keeping an animal within an enclosed space (pen, stall, cage); it does not imply the animal is being removed from the stock permanently.
• Quarantine is the temporary holding of newly arrived animals or animals suspected of carrying disease in a separate area for observation before they are allowed to join the main herd.

The critical distinction is that culling is permanent and driven by the animal's unproductiveness, whereas isolation and quarantine are temporary and driven by health concerns.

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Genetic characteristics are passed from parents to offspring through genes. A gene is the basic unit of heredity - a segment of DNA located on a chromosome that carries the instructions for a specific trait or protein. During reproduction, genes from both parents are transmitted to the offspring via gametes (sperm and egg cells), determining the inherited characteristics of the new individual.

While chromosomes and other structures are involved in the process, the gene is specifically the functional unit that encodes and transmits hereditary information.

The other options are related to genetics but do not directly serve as the unit of hereditary transmission:

• A zygote is the cell formed when a sperm fuses with an egg during fertilization. It is the first cell of a new organism, not the unit that carries genetic information.
• A chromosome is a structure made of DNA and protein that carries many genes. While genes are located on chromosomes, the chromosome itself is the vehicle, not the unit of inheritance - the gene is the functional unit.
• A centromere is the point on a chromosome where the two chromatids are joined together. It plays a role in cell division (ensuring proper chromosome separation) but does not itself encode or transmit genetic traits.

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Maize streak disease is caused by the Maize streak virus (MSV), a member of the genus Mastrevirus in the family Geminiviridae. It is one of the most economically important diseases of maize in sub-Saharan Africa.

The disease is transmitted by leafhoppers, particularly Cicadulina mbila. Infected plants develop characteristic pale yellow to white streaks running along the leaf veins, which give the disease its name. Severe infections can stunt growth and drastically reduce grain yield.

The causal agent is a virus, not a fungus, bacterium, or nematode. Fungal diseases of maize include maize smut (caused by Ustilago maydis) and downy mildew. Bacterial diseases include bacterial leaf blight and Stewart's wilt. Nematodes cause root damage but are not associated with streak symptoms on leaves. The distinctive yellow streaking pattern on maize leaves is a reliable field indicator of viral infection by MSV.

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Artificial insemination (AI) must be timed to coincide with the oestrus (heat) period of the female animal so that fertilisation will take place. During oestrus, the female ovulates (releases a mature egg from the ovary), and the reproductive tract undergoes physiological changes that facilitate sperm transport toward the egg. If semen is deposited at this precise time, the sperm can reach the egg in the oviduct and fertilisation can occur.

The timing has nothing to do with semen virility; the quality of semen is determined at the time of collection and processing, not by when it is deposited. Sperm survival in the female tract is important, but it is a means to an end, not the objective itself. While it is true that a female in oestrus is more receptive, the question asks about why AI must be timed within the oestrus cycle, and the fundamental reason is to ensure that viable sperm and a mature egg are present simultaneously for fertilisation.

In practice, AI is typically performed 12-18 hours after the onset of standing heat in cattle, which aligns with the expected time of ovulation.

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A protein concentrate is a feedstuff that contains a high proportion of crude protein (typically above 20%) and is used in animal rations primarily to supply amino acids for growth, reproduction, and tissue repair. Fish meal is one of the most important protein concentrates in animal nutrition, containing approximately 60-72% crude protein along with essential amino acids, minerals, and vitamins.

The other options are all energy concentrates (also called carbonaceous concentrates), meaning they are rich in carbohydrates but relatively low in protein:

• Cassava flour is predominantly starch with very low protein content (about 1-3%).
• Maize meal is an energy-rich feed with roughly 8-10% crude protein.
• Wheat meal contains around 10-14% crude protein, still below the threshold for a protein concentrate.

In formulating livestock rations, protein concentrates like fish meal, groundnut cake, soybean meal, and cottonseed cake are combined with energy concentrates to achieve the desired nutrient balance for the specific class of animal being fed.

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Damping off (written as "Dumping off" in the question) is a plant disease, not an animal disease. It is caused by soil-borne fungi such as Pythium, Rhizoctonia, and Fusarium that attack seedlings at or near the soil surface, causing them to collapse and die shortly after germination.

The other three options are genuine animal diseases:

• Newcastle disease is a highly contagious viral disease of poultry caused by Newcastle disease virus (paramyxovirus). It affects the respiratory, nervous, and digestive systems of birds.
• Rinderpest (cattle plague) was a severe viral disease of cattle and other ruminants caused by a morbillivirus. It was declared eradicated in 2011 but remains a classic example in agricultural science.
• Coccidiosis is a parasitic disease caused by protozoan organisms of the genus Eimeria, commonly affecting poultry, cattle, and rabbits. It damages the intestinal lining and leads to bloody diarrhoea and poor growth.

Exam tip: When asked to identify the odd one out among diseases, check whether each disease affects animals or plants. Damping off is one of the most commonly tested plant diseases in this type of question.

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Seasoning is the process of reducing the moisture content of freshly harvested ("green") timber to a level suitable for use. Freshly felled wood can contain 50-100% moisture relative to its dry weight; seasoning brings this down to around 12-15%, which is necessary before the wood can be used in construction, furniture-making, or other applications.

Seasoning can be carried out in two ways:

• Natural (air) seasoning - timber is stacked in open air with spacers between planks to allow air circulation. This is slow (months to years) but inexpensive.
• Artificial (kiln) seasoning - timber is placed in a heated, humidity-controlled chamber. This is faster (days to weeks) but more costly.

Unseasoned wood warps, cracks, and shrinks as it dries, so seasoning must come before any further processing or treatment.

Spraying and dipping are methods of applying chemical preservatives to already-seasoned wood. Charring (burning the surface layer) is a preservation technique that makes the outer wood resistant to insects and decay, but it is applied after the timber is ready for use, not as the first post-harvest step.

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From the insect's perspective, the major reason it visits a flower is to suck the nectar. Nectar is a sugary liquid secreted by glands called nectaries at the base of the petals. It serves as a high-energy food reward that attracts insects (and other pollinators). The flower's bright colour, scent, and nectar guides all exist to draw insects toward this reward.

Pollination - the transfer of pollen from the anther to the stigma - is an incidental consequence of the insect's visit, not the insect's intention. As the insect reaches into the flower to feed on nectar, pollen grains stick to its body and are carried to the next flower it visits. So while pollination is the ecological outcome, it is not what motivates the insect.

"To fertilize the flower" is incorrect because fertilization (the fusion of male and female gametes) is an internal process that occurs after pollination; insects play no direct role in it. "To feed on the flower" is too vague - most pollinating insects do not consume the flower's petals or structures; they specifically seek out nectar (and sometimes pollen as a protein source).

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Roughage is a class of animal feed characterised by a very high content of fibre (crude fibre). Roughages include hay, straw, silage, pasture grasses, and crop residues such as maize stover and groundnut haulms. They are bulky feeds with fibre content typically exceeding 18% of dry matter.

The high fibre content comes from the structural components of plant cell walls - primarily cellulose, hemicellulose, and lignin. These are difficult to digest and provide relatively low energy per unit weight compared to concentrates. Ruminants (cattle, sheep, goats) are particularly adapted to utilise roughage because their rumen microorganisms can break down cellulose through fermentation.

The other nutrient options do not characterise roughage:

• Protein-rich feeds are called protein concentrates or supplements (e.g., groundnut cake, soybean meal, fish meal).
• Carbohydrate-rich feeds in the digestible, energy-dense sense are energy concentrates (e.g., maize grain, cassava).
• Fat-rich feeds include palm kernel cake and full-fat soybean. Roughages are typically very low in fat.

Exam tip: Roughage = high fibre, bulky, low energy. Concentrates = low fibre, high energy or protein, less bulky.

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Crop rotation is the practice of growing different crops in a planned sequence on the same piece of land over successive seasons or years. Its importance in sustainable agriculture centres on two key benefits: pest and disease management and soil fertility improvement.

Pest and disease management: Many pests and pathogens are host-specific - they attack particular crop families. When the same crop is grown repeatedly on the same land, these organisms build up in the soil and multiply. Rotating to a different, unrelated crop breaks the pest's life cycle because the new crop is not a suitable host, causing the pest population to decline.

Soil fertility improvement: Different crops draw on different nutrients at different rates. By alternating between heavy feeders (e.g., maize) and nitrogen-fixing legumes (e.g., cowpea, groundnut), the soil's nutrient balance is maintained or improved. Legumes, through their symbiotic relationship with Rhizobium bacteria, convert atmospheric nitrogen into forms that enrich the soil for the next crop.

The other three options describe problems that crop rotation actually helps to prevent, not benefits it produces. Crop rotation reduces erosion (through diverse root systems), decreases dependence on chemical fertilizers, and generally increases - not reduces - overall yield stability.

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Nitrogen (N) is the nutrient most directly responsible for vegetative growth - the development of leaves and stems. It is a core building block of chlorophyll (the green pigment that drives photosynthesis), amino acids, proteins, and nucleic acids, all of which are concentrated in actively growing leaves and shoots.

When nitrogen is abundant, plants produce lush, dark-green foliage and vigorous stems. When nitrogen is deficient, older leaves turn pale yellow-green (chlorosis) because the plant redistributes its limited nitrogen to younger growing points.

The other options describe functions primarily associated with different nutrients:

• Root growth is mainly promoted by phosphorus (P), which supports energy transfer and early root establishment.
• Seed and fruit development are also strongly linked to phosphorus and potassium (K).
• Potassium additionally strengthens disease resistance and regulates water balance in the plant.

Examination tip: The mnemonic "N for kNowledge of leaves, P for Planting roots, K for Keeping fruits" can help recall the primary roles of the three major macronutrients.

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The question asks which option is not a method of harvesting (capturing or collecting) wildlife. Three of the options are established wildlife harvesting methods:

• Baiting - placing food or other attractants to lure animals to a specific location where they can be captured or hunted.
• Trapping - using mechanical devices (snares, cage traps, pitfall traps) to capture animals.
• Shooting - using firearms to kill game animals during a regulated hunt.

Grooming is not a wildlife harvesting method. Grooming refers to the care and maintenance of an animal's body surface - brushing fur, cleaning hooves, trimming feathers, or removing parasites. It is a husbandry practice applied to domesticated or captive animals, not a technique for capturing wild animals from their natural habitat.

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Plants grown mainly for their decorative or aesthetic value are called ornamentals. This is a standard agricultural and horticultural classification. Ornamental plants are cultivated for their attractive flowers, foliage, shape, fragrance, or overall visual appeal rather than for food, fibre, or timber. Examples include roses, hibiscus, bougainvillea, crotons, and palms used in landscaping.

Hedges are a specific use of plants (forming a boundary or barrier), not a classification based on purpose of cultivation. Many hedging plants are ornamental, but "hedge" describes the planting arrangement, not the category. "Beautifiers" is not a recognised agricultural or horticultural term. "Flowers" refers to the reproductive structures of plants; while many ornamentals are valued for their flowers, the term "flowers" is too narrow because ornamental plants also include foliage plants, ornamental grasses, and ornamental trees that are valued for features other than their blooms.

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The oil palm (Elaeis guineensis) is a crop that can be propagated both sexually and vegetatively.

Sexual propagation: Oil palm produces seeds (palm nuts) that can be germinated to grow new plants. This is the most common method of commercial oil palm propagation, using selected seed from controlled crosses of high-yielding parent palms.

Vegetative propagation: Oil palm can also be propagated vegetatively through tissue culture (clonal propagation) and through the separation of suckers (offshoots) that develop at the base of the palm. Tissue culture allows mass production of genetically identical copies of elite palms with high oil yield.

The other crops listed - millet, maize, and groundnut - are propagated almost exclusively by sexual means (seeds). While some grasses can theoretically be divided, millet, maize, and groundnut are not commercially propagated through vegetative methods in standard agricultural practice.

Exam tip: Crops that can be propagated both ways include oil palm, cassava (stems and seeds), sugar cane (setts and seeds), pineapple (suckers/crowns and seeds), and citrus (seeds and budding/grafting).

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Anthrax is a highly infectious and often fatal disease caused by the bacterium Bacillus anthracis. When a farm animal dies from anthrax, the correct procedure is to cremate the carcass or bury it deeply.

This is critically important because Bacillus anthracis forms extremely resilient spores when exposed to air. These spores can survive in the soil for decades and remain capable of infecting other animals and humans. By cremating the carcass (burning it completely) or burying it deeply (at least 2 metres underground, often with quicklime), the bacteria are destroyed or sealed away before they can sporulate and contaminate the environment.

A post-mortem examination is specifically discouraged for anthrax cases because opening the carcass exposes the blood and tissues to oxygen, which triggers spore formation. Discarding the carcass in the bush would spread the spores to the surrounding soil and vegetation, creating a long-term contamination zone. Culling all other animals is an extreme and unnecessary measure if proper biosecurity and vaccination protocols are followed.

On farms in anthrax-prone areas, routine vaccination of livestock is the primary preventive measure.

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Nematodes (roundworms) are microscopic parasitic organisms that attack the root system of crop plants. Species such as root-knot nematodes (Meloidogyne) penetrate root tissues, forming galls and disrupting the root's ability to absorb water and mineral nutrients from the soil.

When roots are severely damaged by nematode infestation, the plant can no longer take up sufficient water to replace what is lost through transpiration. This imbalance causes the plant to wilt, even when soil moisture is adequate. This is sometimes called "wilting disease" in nematode-infested fields.

The other options do not describe effects of nematode attack:

• A mosaic appearance on leaves is a symptom of viral infections (such as tobacco mosaic virus), not nematode damage.
• Nematodes damage and stunt roots rather than causing them to grow faster.
• Flowering induction is controlled by hormones and photoperiod, not by nematode activity.

Exam tip: Nematode symptoms are primarily below-ground (root galls, stunted roots), but the visible above-ground sign is wilting because damaged roots cannot supply adequate water to the shoot.

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Pennisetum purpureum is commonly known as elephant grass (also called Napier grass). It is a tall, robust tropical grass that can grow up to 3-4 metres in height, hence the name "elephant" - reflecting its large size. It is widely cultivated in West Africa and other tropical regions as a fodder crop for livestock due to its high biomass yield.

The other options refer to different grass species:

• Bahama grass is the common name for Cynodon dactylon, a low-growing, creeping grass used for lawns and pastures.
• Guinea grass is Megathyrsus maximus (formerly Panicum maximum), another important tropical pasture grass but a different species.
• Carpet grass is Axonopus compressus, a low-growing grass used for ground cover in moist tropical areas.

Exam tip: Learn the botanical and common names of the most important tropical forage grasses - elephant grass (Pennisetum purpureum), guinea grass (Panicum maximum), bahama grass (Cynodon dactylon), and carpet grass (Axonopus compressus). These appear frequently in JAMB questions.

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In fish farming (aquaculture), cropping refers to the harvesting of fish from the pond once they have reached a marketable or desired size. The term borrows from crop agriculture, where "cropping" means gathering the mature product.

Stocking is the opposite end of the production cycle - it is the introduction of fingerlings (young fish) into the pond at the start of the rearing period. Feeding is the routine provision of feed to promote growth during the rearing phase. Fish storage refers to the preservation of harvested fish (e.g., smoking, drying, freezing) after they have already been removed from the water.

Cropping in a fish pond can be done all at once (complete or total harvesting) or selectively (partial harvesting), depending on whether the farmer wants to remove all fish or only those that have reached the target size while leaving smaller ones to grow further.

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Gypsum (calcium sulphate, CaSO₄) is a soil amendment applied to farmland primarily to reduce soil acidity. When applied to acidic soils, the calcium in gypsum helps to displace hydrogen and aluminium ions from the soil exchange complex, raising the soil pH toward a more neutral level. This makes the soil environment more favourable for crop growth and nutrient uptake.

The other options do not accurately describe the primary purpose of gypsum application. Reducing leaching is not a recognised function of gypsum. Increasing soil acidity is the opposite of what gypsum achieves. While improved soil pH can indirectly benefit soil microorganisms, increasing microbial activity is not the direct purpose of applying gypsum.

In agricultural practice, gypsum is one of several liming materials (alongside calcium carbonate and dolomite) used to correct acidic soil conditions. The correct choice of amendment depends on the severity of acidity and the specific nutrient needs of the soil.

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Mulch is a protective covering placed on the soil surface to reduce evaporation losses and conserve soil moisture. Mulching materials can be organic (such as dry grass, straw, wood chips, crop residues, or leaves) or inorganic (such as plastic sheeting or gravel).

Mulch works by creating a physical barrier between the soil surface and the atmosphere, which slows down the rate at which water evaporates from the soil. It also helps to regulate soil temperature, suppress weed growth, reduce raindrop impact (which lessens soil erosion), and, in the case of organic mulch, adds nutrients to the soil as it decomposes.

Contour refers to contour ploughing or contour ridging, which is a soil conservation technique where furrows are ploughed along the slope contour to reduce water runoff and erosion. Drainage is the removal of excess water from the soil, which is the opposite of conserving moisture. A soil profile is a vertical cross-section of the soil showing its distinct layers (horizons), and it is a descriptive concept, not a farming practice.

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When chemicals (pesticides, herbicides, fungicides) are used to prevent and control pests and diseases of crops, they produce several side effects - unintended negative consequences that come alongside the intended pest or disease control. The question asks which option is not a side effect.

Improved quality of farm produce is not a side effect of chemical use. It is, rather, the intended positive outcome (or benefit) of successfully controlling pests and diseases. When pests and diseases are controlled, the produce quality naturally improves. A side effect, by definition, is an unintended and usually undesirable consequence.

The other options are genuine side effects of chemical pest and disease control:

• Poisoning of insects - chemicals kill not only target pests but also beneficial insects such as pollinators (bees, butterflies) and natural predators (ladybirds, parasitic wasps).
• Destruction of pathogens - while destroying the target pathogen is intended, chemicals can also destroy beneficial soil microorganisms, disrupting the soil ecosystem.
• Environmental pollution - chemical residues contaminate soil, water bodies, and the atmosphere, causing long-term ecological damage.

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In poultry keeping, litter refers to materials such as wood shavings, sawdust, straw, or dried grass spread on the floor of a poultry house. Its primary function is to absorb moisture from the birds' droppings, keeping the floor dry and reducing the buildup of ammonia fumes that can harm the birds' respiratory systems.

While a clean, dry litter environment can indirectly help reduce the incidence of certain diseases, litter itself is not a disease control measure. Litter does not serve as a roost (birds roost on perches or slatted frames above the floor). It also does not protect birds from predators; that function belongs to the housing structure, fencing, and secure enclosures.

Good litter management involves maintaining appropriate depth (typically 5-10 cm), turning or replacing litter regularly to prevent caking, and ensuring adequate ventilation. Wet, compacted litter promotes bacterial growth and increases the risk of diseases such as coccidiosis and bumblefoot.

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Agricultural extension services are programmes and organisations that bridge the gap between agricultural research and farming practice. Their primary role is to provide farmers with information and training on improved farming practices, helping them adopt better techniques, use improved crop varieties and livestock breeds, manage pests and diseases, and apply modern technologies to increase productivity.

Extension officers work directly with farming communities through farm visits, demonstrations, field days, workshops, and the distribution of educational materials. They translate research findings into practical advice that farmers can apply on their land.

Extension services do not control the prices of agricultural products; that falls under government pricing policy and market regulation. They actively encourage crop diversification and the adoption of new technologies rather than discouraging or limiting these practices. The entire purpose of extension is to accelerate the transfer of knowledge and innovation from research institutions to farmers in the field.

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Soil structure refers to the way individual soil particles (sand, silt, and clay) are arranged and bound together into larger units called aggregates or peds. These aggregates are separated by pore spaces that allow the movement of air and water through the soil.

The cementing agents that bind soil particles into aggregates include organic matter (humus), iron and aluminium oxides, calcium carbonate, and clay minerals. The resulting structure affects how well the soil drains, how easily roots penetrate it, and how much air and water it can hold.

Soil structure should not be confused with the other terms:

• Soil texture refers to the relative proportions of sand, silt, and clay particles in the soil. It describes the size distribution of individual particles, not how they are arranged.
• Soil consistency describes the resistance of a soil to deformation or rupture, and how it feels (sticky, plastic, loose, friable) at different moisture levels.
• Soil colloids are extremely fine particles (less than 0.001 mm) of clay and humus that carry electrical charges and play a role in nutrient retention, but the term does not describe the aggregation process.

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The three recognised methods of livestock improvement are introduction, selection, and breeding. A farmer who wants to improve the genetic quality of a cattle herd should adopt all three in combination:

• Introduction involves bringing in superior breeds or genetic material from another region or country to improve the local stock. For example, importing exotic breeds with higher milk yield or faster growth rate.
• Selection is the process of choosing the best-performing animals from the existing herd based on desirable traits (high milk yield, disease resistance, fast growth) and keeping them as breeding stock while culling the rest.
• Breeding is the controlled mating of selected animals to produce offspring that combine desirable traits from both parents.

The other options mix improvement methods with routine management practices that do not directly improve genetics:

• Flushing is a nutritional practice of increasing feed quality before mating to boost ovulation rate - it improves fertility temporarily, not the breed.
• Creep feeding is providing supplementary feed to young animals - it improves growth, not genetics.
• Branding is an identification method, not a breeding strategy.
• Ad lib feeding (feeding freely) is a management practice, not a genetic improvement method.