WAEC Agriculture 2017
Questions & Answers

One might mistakenly choose deposition or weathering by confusing the actual transportation phase with the breakdown of rocks or the settling of particles. Erosion refers to the removal and transportation of soil particles by agents such as wind, water, or ice, where wind erosion specifically moves soil particles across the surface, distinguishing it from weathering in place or deposition. Common mistake: Confusing soil erosion with weathering or deposition processes.

A student could mistakenly select seed sowing by assuming all plants start naturally from seeds, ignoring commercial constraints. Pineapple is vegetatively propagated using suckers arising from the base of the plant, slips from the fruit stalk, or crowns from the top of the fruit, while seed sowing is rare in commercial practice due to genetic variability. Common mistake: Assuming pineapples are commonly grown from seeds rather than vegetative parts.

A test-taker might mistakenly select deeper planting depths like 8-10 cm by assuming larger holes protect seeds better. Soybean seeds are small and require shallow planting at 2-4 cm to ensure good germination and emergence, because deeper planting delays emergence and reduces seedling vigor due to limited energy reserves in the seed. Common mistake: Planting small legume seeds too deeply, which hinders seedling emergence.

One might incorrectly choose nitrogen by confusing vegetative growth requirements with reproductive needs. Phosphorus is critical for energy transfer via ATP, seed formation, and reproductive development, promoting strong root systems and high-quality seed fill to make it the most essential nutrient for healthy seed development. Common mistake: Associating general vegetative leaf growth nutrients with seed and reproductive development.

A student might mistakenly choose hydroponics by missing the presence of fish in the system description. Aquaponics integrates aquaculture, which is fish farming, with hydroponics, where fish waste provides nutrients for plants and plants filter water for fish, whereas hydroponics uses only nutrient solution without fish. Common mistake: Confusing aquaponics with standard hydroponics that lacks fish aquaculture.

A test-taker could mistakenly select citrus canker or powdery mildew by assuming all visible crop diseases share the same pathogen type. Tristeza is a devastating viral disease caused by the Citrus tristeza virus leading to decline and death of trees on sour orange rootstock, whereas citrus canker is bacterial and powdery mildew is fungal. Common mistake: Classifying bacterial or fungal citrus afflictions as viral infections.

A student might incorrectly choose organic matter or rainfall by overestimating their mineral contribution compared to geological formations. Potassium in soils originates mainly from the weathering of potassium-rich minerals like feldspars and micas, while organic matter contributes smaller amounts and rainfall adds only trace levels. Common mistake: Believing organic matter is the primary native source of soil potassium.

One might mistakenly choose goats by confusing mohair production with fleece harvested from sheep. Sheep, especially Merino breeds, are the primary source of wool due to their dense, crimped fleece, whereas angora goats produce mohair and rabbits produce angora. Common mistake: Confusing goat mohair with sheep wool production.

A test-taker could mistakenly select pruning or thinning by confusing general branch maintenance with height reduction techniques. Pollarding involves cutting back the upper branches to a specific height to promote dense regrowth and control size, whereas pruning is general branch removal and thinning reduces canopy density. Common mistake: Confusing pollarding with general pruning or thinning practices.

A student might incorrectly select drying or smoking by ignoring the explicit application of salt in the preservation process. Curing involves treating fish with salt, either dry or in brine, to draw out moisture and inhibit bacterial growth, whereas smoking uses heat and smoke and drying removes water without necessarily using salt. Common mistake: Confusing general fish drying with salt curing.

One might mistakenly select inbreeding by confusing genetic purification with the introduction of hybrid vigor. Crossbreeding mates individuals from different breeds or lines to exploit heterosis, known as hybrid vigor, improving traits like growth rate and fertility, whereas inbreeding increases homozygosity. Common mistake: Confusing inbreeding depression or line breeding with the hybrid vigor of crossbreeding.

A student could mistakenly choose iron by confusing trace micronutrients with secondary macronutrients. Secondary macronutrients are calcium, magnesium, and sulfur, which are required in moderate amounts, whereas iron, zinc, and copper are micronutrients needed in trace quantities. Common mistake: Classifying iron as a secondary nutrient instead of a micronutrient.

A test-taker might mistakenly select sericulture or pisciculture by mixing up the Greek roots for silk or fish farming with insect husbandry. Apiculture is the scientific management of honey bees for honey and wax, whereas sericulture handles silk and pisciculture manages fish. Common mistake: Confusing apiculture with sericulture or pisciculture.

A student might incorrectly choose root rot or stem cracking by assuming nutrient deficiencies always manifest as structural damage. Magnesium deficiency causes interveinal chlorosis, which is yellowing between veins in older leaves due to its vital role in chlorophyll, whereas leaf drop, root rot, and stem cracking are not typical symptoms. Common mistake: Expecting physical stem or root degradation from a chlorophyll-related deficiency.

Students might mistakenly choose herbicide use or mulching because these methods are commonly used for general crop care, whereas burning is clearly a hazardous outlier. By reasoning through the needs of a vegetable garden, we find that hand weeding delivers complete, precise extraction without leaving dangerous chemical residues. Herbicides pose a constant risk of harming the crops, mulching only suppresses weeds rather than getting rid of them fully, and burning is both impractical and hazardous. Common mistake: Confusing weed suppression techniques like mulching with complete weed elimination.

Learners often select options like Napier grass because it is a common forage plant in farming, making it sound similar to legume cover crops. When sorting through the choices, Mucuna (velvet bean) functions as a nitrogen-fixing legume that actively suppresses weeds. On the other hand, Pennisetum, Napier grass, and Andropogon belong to the grass family rather than the legume family. Common mistake: Assuming all tall green forage plants used in fields are legumes.

Anemia or scurvy might be picked due to general familiarity with vitamin and nutritional deficiency diseases in human or veterinary health. To identify the correct condition, we look at how nutrient shortages manifest in skeletal systems: rickets arises specifically from a lack of vitamin D, which disrupts calcium absorption and leads to soft, deformed bones in young animals. Meanwhile, anemia stems from iron or B12 shortages, scurvy comes from a lack of vitamin C, and beriberi is tied to thiamine. Common mistake: Confusing bone-related deficiencies with general nutritional disorders like anemia.

A student might incorrectly choose improves pasture quality or increases soil fertility by confusing heavy grazing pressure with natural manure fertilization. Looking at the long-term environmental impact, overgrazing strips away the protective layer of vegetation, which leaves the ground completely vulnerable to destructive wind and water erosion while simultaneously degrading fertility and reducing biodiversity. Common mistake: Overlooking the physical damage caused by the removal of plant cover.

Ranching or rotational grazing might seem plausible because both terms describe livestock management involving land areas. However, looking closely at the definition of confinement and controlled feeding points directly to zero grazing, which is a cut-and-carry system that confines animals indoors and supplies fresh forage to regulate diet and prevent pasture destruction. In contrast, extensive systems use free-range grazing, ranching refers to large-scale open land grazing, and rotational grazing moves herds between different paddocks. Common mistake: Confusing the intensive confinement of zero grazing with open rotational paddock systems.

Aphids or weevils are often selected because they are widely recognized insect pests affecting crops and stored goods. By focusing on the specific vulnerability of cocoa plants, we identify the capsid bug, which uses its mouthparts to pierce and suck sap from cocoa leaves and pods, resulting in distinct lesions and tissue distortion. Aphids generally affect other crops rather than attacking cocoa leaves first, termites target roots and stems, and weevils focus on storage. Common mistake: Generalizing all sap-sucking insects as major threats to cocoa foliage.