WAEC Agriculture 2019
Questions & Answers

A student might mistakenly select ploughing, which actually inverts the soil layers rather than just loosening the surface. Harrowing involves using a harrow to break up clods and loosen the soil surface after ploughing without turning it over, preparing a fine seedbed while preserving soil structure and minimizing erosion. Common mistake: Confusing the soil-inverting action of ploughing with the surface-loosening action of harrowing.

A reader might choose seed sowing or cutting, overlooking the specific horticultural challenges of growing true-to-type fruit trees. Mangoes are commonly propagated by grafting techniques such as cleft or veneer grafting to ensure true-to-type plants with desirable traits like disease resistance and fruit quality, since seed propagation leads to high variability. Common mistake: Assuming fruit trees grow true to type reliably from standard seed sowing.

1) Distractor check: A student might incorrectly choose options like 10-12 cm or 15-20 cm, assuming deeper burial provides better anchoring or moisture. 2) Reasoning to the answer: Because these seeds are naturally small-sized, placing them at a shallow level of 2-4 cm allows for rapid sprouting and breaking through the surface. Burying them deeper fails because limited seedling vigor prevents successful establishment. Common mistake: Confusing deep planting requirements of large seeds with small seeds.

1) Distractor check: A student might select Nitrogen, thinking of overall lush vegetative growth, or Potassium, which is also a major macronutrient. 2) Reasoning to the answer: Phosphorus is fundamentally involved in energy transfer pathways utilizing ATP and supports root development. These biological processes are vital for reproductive development, which directly drives flower bud formation and successful pollination. Common mistake: Forgetting that flower and fruit stages demand high phosphorus rather than just vegetative nitrogen.

1) Distractor check: A student might mistakenly pick Hydroponics, confusing the idea of a controlled indoor setup with growing plants in nutrient solutions without soil. 2) Reasoning to the answer: Greenhouse farming utilizes enclosed structures to gain precise environmental regulation over variables like temperature, relative humidity, and artificial lighting supplementation, thereby achieving year-round production success and maximizing crop yields. Common mistake: Confusing soilless culture with enclosed structure farming.

1) Distractor check: A student might select Mosaic, thinking it is a common plant affliction, or Leaf blight. 2) Reasoning to the answer: Maize smut originates from the pathogenic fungus Ustilago maydis, which specifically attacks corn ears and tassels to create tumor-like galls filled with spores. Producers typically manage this fungal infection through crop rotation and resistant varieties. Common mistake: Mixing up viral symptoms like mosaic with fungal galls like smut.

1) Distractor check: A student might choose Organic matter, thinking all natural nutrients come straight from composted plant or animal waste. 2) Reasoning to the answer: Rock phosphate serves as the foundational geological parent material that undergoes slow weathering to release phosphorus ions. This creates the inorganic pool from which plants acquire this crucial nutrient. Common mistake: Assuming organic matter is the primary geological reservoir for phosphorus.

1) Distractor check: A student might pick Chicken or Goat, overlooking the primary commercial scale of heavy meat production. 2) Reasoning to the answer: Cattle are primarily bred for beef production within extensive systems. They efficiently convert bulky forage into high-value protein meat, which sustains global supply chains. Common mistake: Equating all livestock production systems solely with poultry or small ruminants.

1) Distractor check: A student might choose Irrigation, mixing up the introduction of water with its removal. 2) Reasoning to the answer: Surplus water is cleared out using drainage systems such as open ditches or tile drains. Eliminating this excess prevents waterlogging, which otherwise causes root suffocation, severe nutrient loss, and decreased crop yields. Common mistake: Confusing drainage with irrigation.

1) Distractor check: A student might pick Drying or Freezing, since both are popular methods of food preservation. 2) Reasoning to the answer: Canning relies on applying heat to fruits inside sealed jars to eradicate enzymes and microorganisms. This procedure forms a secure vacuum seal that preserves shelf life for months without needing refrigeration. Common mistake: Assuming freezing is the only heat-free preservation method.

1) Distractor check: A student might mistakenly choose Inbreeding or Line breeding, confusing mating strategies. 2) Reasoning to the answer: Crossbreeding merges distinct genetic backgrounds from separate breeds to yield hybrids exhibiting hybrid vigor, also known as heterosis. This strategy enhances traits like disease resistance, growth rate, and overall environmental adaptability. Common mistake: Confusing the introduction of new genetic traits via crossbreeding with preserving traits via inbreeding.

1) Distractor check: A student might select Magnesium or Sulphur, which are macronutrients or secondary nutrients required in larger quantities. 2) Reasoning to the answer: Boron functions as a vital micronutrient responsible for cell wall construction, sugar transport, and pollen tube growth. Although required in tiny amounts, its absence leads to brittle tissues and poor seed set. Common mistake: Mistaking trace micronutrient requirements for macronutrient needs.

1) Distractor check: A student might choose Apiculture or Sericulture, mixing up animal rearing terms. 2) Reasoning to the answer: Cuniculture is the specific term for breeding and managing rabbits, scientifically known as Oryctolagus cuniculus, inside hutches or colonies. They are kept for their pelts used in the fur industry and their lean meat, which is low in cholesterol. Common mistake: Confusing cuniculture (rabbits) with sericulture (silkworms) or apiculture (bees).

1) Distractor check: A student might pick Wilting leaves or Stunted growth, which are general symptoms common to many nutrient deficiencies. 2) Reasoning to the answer: Although chlorine deficiency is rare in most soils, it causes distinct bronzing or yellowing along leaf margins, particularly on younger leaves. This occurs because chlorine plays an integral role in osmosis and stomatal regulation. Common mistake: Attributing leaf bronzing solely to disease rather than specific micronutrient shortages.

1) Distractor check: A student might choose Plowing or Burning, thinking physical manipulation fixes waterlogged land. 2) Reasoning to the answer: Swampy lands are reclaimed most effectively by draining them using channels or pumps. This action lowers the water table, aerates the soil, and permits the cultivation of crops like rice or vegetables, often followed by liming to adjust acidity. Common mistake: Trying to fix swampy soils with tillage instead of lowering the water table.

1) Distractor check: A student might select Pueraria or Centrosema, which are common pasture components. 2) Reasoning to the answer: Andropogon, such as guinea grass, is a tropical C4 grass utilized in pastures for its remarkable drought tolerance and high biomass yield. Unlike the other listed options, it does not fix nitrogen. Common mistake: Confusing leguminous cover crops with non-leguminous pasture grasses.

1) Distractor check: A student might select Rickets or Scurvy, which are linked to vitamin D and vitamin C deficiencies, respectively. 2) Reasoning to the answer: A lack of vitamin E causes oxidative damage within muscle tissues, resulting in white muscle disease, also called nutritional muscular dystrophy. This condition frequently affects young ruminants like calves and lambs. Common mistake: Confusing mineral-related bone disorders like rickets with vitamin E muscle degeneration.

1) Distractor check: A student might pick Reduces labor or Improves soil fertility, incorrectly assuming large-scale single-crop farming benefits the ecosystem. 2) Reasoning to the answer: Monoculture creates an environment that fosters pest and disease proliferation by continuously supplying the same host. This reliance requires heavy pesticide applications and increases resistance risks, unlike diversified crop systems. Common mistake: Assuming uniform crop fields simplify long-term pest management.

1) Distractor check: A student might select Intensive system or Zero grazing, mixing up free-range practices with confined management. 2) Reasoning to the answer: Extensive systems depend on utilizing natural pastures across vast geographical spaces with minimal human inputs. While suitable for low-density farming regions, they risk severe overgrazing if rotational management is ignored. Common mistake: Confusing extensive range grazing with intensive or zero-grazing confinement.

1) Distractor check: A student might pick Aphid or Mealybug, which are also common sap-sucking orchard pests. 2) Reasoning to the answer: Citrus fruit flies, such as Bactrocera species, deposit their eggs directly inside developing fruits. The resulting larval feeding triggers premature fruit drop and rot, which growers manage using sanitation and traps. Common mistake: Confusing foliage-feeding sap pests with internal fruit-boring flies.

1) Distractor check: A student might select Nitrification or Denitrification, confusing the steps of the nitrogen cycle. 2) Reasoning to the answer: Ammonification is carried out by microbial decomposition of organic matter like proteins, which releases ammonium ions. This biological transformation serves as the initial step in the nitrogen cycle that makes nitrogen accessible to plants. Common mistake: Confusing the conversion of organic nitrogen to ammonia with the conversion of ammonia to nitrates.

1) Distractor check: A student might choose Adding lime or Using gypsum, forgetting how soil pH adjustments operate chemically. 2) Reasoning to the answer: Elemental sulphur is oxidized by soil bacteria into sulphuric acid, which drives down pH levels in alkaline soils exceeding pH 7.5 to enhance nutrient availability. This is the opposite of lime, which increases pH. Common mistake: Using lime when trying to lower the pH of alkaline soils.

1) Distractor check: A student might pick 20cm x 20cm, confusing soybean spacing with smaller grain crops. 2) Reasoning to the answer: A planting arrangement of 75 cm between rows and 25 cm between plants provides optimal light interception and air circulation. This layout targets a population of roughly 300,000 plants per hectare for indeterminate varieties. Common mistake: Planting soybeans too densely, which restricts air circulation and reduces yields.

1) Distractor check: A student might choose Foot rot or Anthrax, which are bacterial or fungal issues rather than parasitic protozoan infections. 2) Reasoning to the answer: Trypanosomiasis, commonly known as sleeping sickness, is caused by Trypanosoma protozoa spread by tsetse flies. It causes severe anemia and emaciation in cattle and is especially prevalent in regions infested by tsetse vectors. Common mistake: Confusing vector-borne protozoan parasites with bacterial hoof infections.

1) Distractor check: A student might choose Grinding food or Fermentation, attributing stomach compartments to the wrong mechanical or chemical duties. 2) Reasoning to the answer: The omasum features specialized leaf-like absorptive surfaces designed to extract and recycle water and minerals from digesta. This helps maintain proper fluid balance within the rumen to support efficient microbial fermentation. Common mistake: Confusing the water-absorbing role of the omasum with the microbial fermentation of the rumen.

1) Distractor check: A student might choose Use of herbicides or Mulching, thinking chemical or physical tactics represent biological methods. 2) Reasoning to the answer: Biological weed control relies on deploying natural enemies, such as introducing weevils to combat water hyacinth. This selectively targets weed populations, lowers chemical dependence, and supports agricultural sustainability. Common mistake: Confusing chemical weed control methods with biological predator introductions.

1) Distractor check: A student might choose Intercropping or Monoculture, confusing sequential planting with simultaneous or single-crop methods. 2) Reasoning to the answer: Crop rotation alternates different plant families, such as following cereals with legumes, over successive seasons. This practice interrupts pest life cycles, prevents nutrient exhaustion, and boosts soil fertility through nitrogen fixation. Common mistake: Confusing sequential crop rotation with simultaneous intercropping.

Students might mistakenly pick potassium or phosphorus because these are also essential macronutrients involved in plant health. Nitrogen is essential for chlorophyll synthesis, and because it has high mobility, plants translocate it from older foliage to younger developing leaves when supplies run low. This internal relocation leads directly to chlorosis and yellowing exclusively in the lower leaves. Common mistake: confusing the mobility of nitrogen with immobile nutrients like calcium.

Options like damp sacks or humid environments might seem plausible if a student forgets that moisture accelerates spoilage. To maintain quality and block fungal growth, such as Aspergillus species, grain must undergo dry storage at twelve to fourteen percent moisture within ventilated silos. Any humidity rising above fifteen percent invites mold proliferation and the dangerous production of aflatoxins. Common mistake: assuming high humidity is safe for grain storage.

A student might mistakenly choose ticks or mites since these are also common external ectoparasites found on livestock. However, pig lice specifically known as Haematopinus suis target the skin of swine, inducing severe irritation and anemia. Intensive piggery management systems typically control these infestations by combining topical insecticides with strict sanitation protocols. Common mistake: failing to match specific parasite species to their exact host animal.

Students could mistakenly select liming or tilling, thinking any soil amendment technique works to boost fertility. Composting works by decomposing plant and animal wastes into humus-rich manure, which subsequently enhances soil structure, boosts water retention, and stimulates microbial activity to ensure sustained fertility. Common mistake: confusing the addition of organic matter with chemical pH adjustments like liming.

Options like maize or wheat might tempt a student because they are major global cereal crops grown extensively by farmers. Sugarcane, botanically known as Saccharum officinarum, stands apart because it stores up to twenty percent sucrose directly within its stalks. Harvesting these stalks supports the wider sweetener industry, yielding raw sugar, molasses, and ethanol. Common mistake: assuming all major agricultural crops are primarily cultivated for starch rather than sugar.

A student might mistakenly choose a lower humidity range like forty to fifty percent, fearing that moisture encourages spoilage. Maintaining high relative humidity between eighty-five and ninety percent in chilled storage kept at zero to two degrees Celsius prevents the desiccation of fish surfaces. This balanced environment preserves texture and weight while successfully inhibiting bacterial growth. Common mistake: confusing moisture control for fresh produce with the high humidity needed to prevent surface drying in fish.

Overgrazing or deforestation might be mistakenly chosen because they are environmental problems associated with land degradation rather than solutions. Afforestation works in the opposite direction by establishing tree belts that stabilize shifting sand dunes, restore lost soil moisture, and foster protective microclimates. These barriers effectively counter wind erosion and reverse land degradation in arid zones. Common mistake: selecting a destructive land-use practice instead of a restorative one.

Equine influenza or colic might look correct since both are well-known health issues impacting horses. Strangles is specifically identified as an upper respiratory bacterial infection caused by Streptococcus equi, resulting in painful abscessed lymph nodes. Veterinary management for this condition typically involves vaccination alongside targeted antibiotic treatments. Common mistake: confusing viral respiratory infections with bacterial ones in horses.

Diesel or coal might be mistakenly selected because they are traditional power sources heavily utilized in standard farming machinery. Solar energy provides a renewable alternative by using photovoltaic panels to power irrigation pumps and crop drying systems. Because it replenishes naturally without depletion, it helps reduce overall fossil fuel dependence within sustainable agriculture. Common mistake: confusing exhaustible fossil fuels with naturally replenished energy sources.

Terracing or strip cropping might seem plausible since they are also recognized soil conservation methods used on sloped terrain. Contour ridging specifically involves building barriers perpendicular to slopes, which effectively slows down water flow, traps sediment, and reduces erosion on hilly farmlands, particularly for row crops. Common mistake: confusing the broad practice of terracing with the specific ridge barriers built along contours.

Bone deformity or hair loss might catch a student's eye because mineral imbalances often manifest through structural or integumentary issues. Copper plays a vital role in hemoglobin formation, meaning a deficiency directly leads to hypochromic anemia, depigmentation, and swayback in lambs due to impaired iron metabolism. Common mistake: attributing all trace mineral deficiencies in livestock strictly to bone or joint disorders.

Selling farm inputs or providing loans might be incorrectly chosen because they represent other important aspects of agricultural support services. Agricultural extension officers focus on disseminating research-based knowledge through practical demonstrations and training sessions. This educational outreach empowers farmers by introducing improved practices that boost productivity and adoption rates. Common mistake: confusing commercial agricultural suppliers with educational extension personnel.

Soil texture or air temperature might be mistakenly chosen because environmental factors heavily dictate basic agronomic limits. Market demand directly influences crop variety selection by prioritizing specific consumer preferences and prolonged shelf life, which guarantees economic viability and aligns farm production with profitable sales outlets. Common mistake: prioritizing physical environmental traits over economic market forces when deciding on crop varieties.