WAEC SSCE - Agricultural Science - 1992 (Objective)

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The factor that causes etiolation in crops is the absence of light. Etiolation is a growth response of plants when they are grown in low light conditions. When plants don't get enough light, they produce less chlorophyll and become pale, elongated, and weak, with long, spindly stems. This is because plants need light to carry out photosynthesis, which is the process by which they make their own food. Without enough light, they cannot produce enough energy to support normal growth, so they grow tall and thin in an attempt to reach more light. The other factors mentioned - low humidity, high humidity, high light intensity, and low temperature - can affect plant growth and development in other ways, but they do not cause etiolation.

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Climate knowledge is useful in determining all the options listed except for marketing practices and strategies. Understanding the climate of a particular region is crucial for making informed decisions about land use, crop and livestock management practices, and harvesting and storage methods. For example, knowledge of the typical rainfall patterns, temperature ranges, and humidity levels can help farmers decide on appropriate tillage practices and crop varieties that are adapted to the local climate. However, marketing practices and strategies are not directly related to climate. While climate can indirectly influence market conditions, such as through the impact of extreme weather events on crop yields and prices, marketing decisions are more influenced by factors such as consumer preferences, market competition, and the overall economic environment.

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The most suitable raw material used in the production of pulp in the paper industry is softwood. Softwood comes from coniferous trees like spruce, pine, and fir. Softwood is preferred for pulp production because it has longer fibers, making it easier to break down and turn into pulp. Softwood pulp also has higher strength and stiffness compared to hardwood pulp, which makes it ideal for producing high-quality paper products like newsprint, copy paper, and tissue paper. Hardwood, on the other hand, has shorter fibers and is more difficult to break down into pulp. Hardwood pulp is typically used for products that require a smooth surface, like glossy magazines and fine writing paper. Heartwood and sapwood are not used for pulp production as they are parts of a tree's anatomy and have different properties than the actual wood fibers. Plywood, while made from wood, is a finished product and not a raw material used in pulp production.

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The process of removing excess water from the soil surface and upper subsoil is known as drainage. Drainage can be accomplished naturally through the soil's ability to absorb and transmit water, or it can be done artificially through the use of drainage systems such as pipes and ditches. The purpose of drainage is to prevent waterlogging, which can lead to reduced plant growth, soil erosion, and other negative effects on the environment. Drainage is especially important in areas with high rainfall or poor soil drainage characteristics.

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The parts of plants that are normally used for vegetative propagation are the stem, root, and leaf. This is because these parts of the plant contain specialized cells that can regenerate into new plants. Stem cuttings, for example, can be taken from a mature plant and grown into a new plant. Similarly, root cuttings or sections of the root can also regenerate and form new plants. Leaf cuttings are another method of vegetative propagation where the leaf is cut and then placed in a growing medium where it develops into a new plant. On the other hand, seeds are typically used for sexual reproduction and not vegetative propagation. They contain genetic material from both the male and female parent plants and result in offspring that are not genetically identical to the parent plant. This is in contrast to vegetative propagation, which produces offspring that are genetically identical to the parent plant.

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The characteristic that is not associated with a good pasture is "Ability to provide mainly high quality carbohydrates." A good pasture is an area of land that provides plants that are suitable for grazing animals to feed on. It should be able to withstand extremes of climate and soil conditions, competition from weeds or other forage crops, and produce high quality fresh leaves. Additionally, it should have high palatability and nutritional content to provide adequate sustenance for grazing animals. While carbohydrates are important in a grazing animal's diet, a good pasture should not only provide high-quality carbohydrates but also a balanced amount of proteins, fats, vitamins, and minerals to support the animal's health and growth. Therefore, the ability to provide mainly high-quality carbohydrates alone is not a defining characteristic of a good pasture.

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The quickest way to get a large harvest of oranges from a tree with desirable qualities is by grafting a branch from the tree with desirable qualities to the stock of other citrus trees. Grafting is a process where a piece of a tree with desirable qualities (called the scion) is attached to the trunk or root of another tree (called the rootstock). This way, the new tree will have the desirable qualities of the scion, and it will grow and produce fruit faster than starting from a seed or cutting. This method is commonly used by farmers to reproduce and distribute trees with desirable qualities, such as disease resistance or high fruit yield.

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The most appropriate farm machinery for breaking soil is the plough. A plough is a tool used to turn over and loosen the soil, creating a furrow for planting. It is the oldest and most traditional method of breaking soil for farming. A plough is designed with a blade that digs into the soil and turns it over, bringing up fresh soil from below the surface. The plough can be pulled by animals, such as horses or oxen, or by a tractor. Compared to other options, such as a harrow or cultivator, the plough is better suited for breaking new ground or soil that has not been worked for a long time. Harrows and cultivators are typically used for maintaining existing soil that has already been broken. The ridger, on the other hand, is used for creating ridges or mounds in the soil for planting crops like potatoes, but it is not primarily used for breaking soil. In summary, the plough is the most appropriate farm machinery for breaking soil due to its design and effectiveness in loosening and turning over the soil.

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The option that will not help milk let-down in a lactating dairy cow is the injection of progesterone. Progesterone is a hormone that is primarily involved in the preparation and maintenance of pregnancy in mammals. It plays no role in the milk let-down process. On the other hand, the other options listed can all help stimulate milk let-down in a lactating dairy cow. Oxytocin is a hormone that is naturally released during suckling or milking and stimulates milk let-down. The presence of a calf or milker also mimics the natural suckling process and can stimulate milk let-down. Additionally, providing feed can stimulate the release of hormones that aid in milk production and let-down.

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The livestock disease caused by a fungus is called aspergillosis. This disease is caused by a fungus called Aspergillus, which can grow on feed and bedding material. Livestock can inhale the spores of the fungus, which can then infect their lungs and respiratory system. Aspergillosis can affect various animals including cattle, pigs, poultry, and sheep. Common symptoms of this disease include difficulty breathing, coughing, weight loss, and decreased appetite. Treatment for aspergillosis may include antifungal medication and improved ventilation and hygiene practices in the animal's living environment.

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The law of diminishing returns relates to the factor of production known as "variable factors". This law states that as more and more of a variable factor (such as labor or raw materials) is added to a fixed amount of other factors of production (such as land or capital), the marginal product of the variable factor will eventually decrease, leading to a decrease in overall productivity. In simpler terms, adding more and more workers to a factory or farm may initially lead to increased output, but eventually, the additional workers may start getting in each other's way or using up resources faster than they can be replenished, resulting in a decrease in output per worker.

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The aim of improving crops is to increase the quantity and quality of agricultural products. Among the options given, "improving mechanical method of harvesting crops" is not an aim of improving crops. Rather, it is a technique used to make the harvesting process more efficient, and it is not directly related to the characteristics of the crops themselves. To put it simply, the first four options are focused on improving the crops themselves to make them more resistant, adaptable, and productive, while the last option is about improving the process of harvesting these crops.

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The answer is "soil". Soil is not a biotic factor affecting agricultural production, but an abiotic factor because it is a non-living component of the environment. Biotic factors are living organisms that affect agricultural production, such as predators, parasites, pests, and diseases. These organisms interact with plants and animals in the ecosystem, and their presence or absence can greatly impact the success of agricultural production. On the other hand, soil provides the physical support for plants, as well as nutrients and water, but it does not actively participate in the ecosystem as a living organism.

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When an animal is being fed a diet that only provides the necessary nutrients for maintaining its health and body weight, without promoting any growth or production, this type of diet is called a maintenance ration. This ration is designed to provide the minimum amount of energy and nutrients required to sustain the animal's basic metabolic processes and physical activity. The goal is to maintain the animal's body weight and prevent it from losing or gaining weight. The maintenance ration is typically used for animals that are not intended for growth or production, such as mature animals that have reached their full size or animals that are not being used for breeding or milk production.

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The option that is not an advantage of drip-irrigation is "its efficiency on water distribution in steep slopes is poor." Drip-irrigation is a method of applying water directly to the root zone of plants in a slow and precise manner. It has several advantages, such as the ability to apply fertilizers through the system, reducing the concentration of salt in the root zone, operating on a much lower line pressure than sprinkler systems, and considerable maximization of water use. However, on steep slopes, the efficiency of water distribution through drip-irrigation may be reduced because the water may flow downward too quickly, leaving some plants without adequate moisture. In such cases, other irrigation methods such as terracing or contour farming may be more suitable.

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The disease that causes abortion in cattle during the later stages of pregnancy is called brucellosis. It is caused by a bacterium called Brucella abortus, which can be transmitted to cattle through infected feed, water, or other animals. Brucellosis can also spread to humans, causing flu-like symptoms, but it is primarily a reproductive disease in cattle. It can lead to the abortion of a calf, the birth of a weak or deformed calf, or the inability of the cow to conceive in the future. To prevent the spread of brucellosis, farmers should practice good hygiene and biosecurity measures, such as quarantining new animals and testing for the disease regularly. Infected animals should be isolated and treated appropriately.

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The preventive and control measures of pests and diseases of crops have various side effects, including environmental pollution, poisoning of wildlife, and disruption of the ecosystem. These measures are often implemented to improve the quality of farm produce and protect crop yield, but they may also expose farmers to health hazards. However, the option that does not fit with the rest is "improvement in the quality of farm produce." This is because this option does not describe a side effect but rather a desired outcome of implementing preventive and control measures. The other options all describe unintended consequences or negative impacts on the environment, wildlife, and human health that can result from the use of pesticides and other control measures.

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Clearing agricultural lands clean of all vegetation and trees can have several negative effects on the soil and the surrounding environment. However, one of the effects that is not usually associated with this activity is the complete removal of soil nutrients. When plants and trees are removed from the land, the soil is exposed to several environmental factors such as wind, rain, and direct sunlight. These factors can cause soil erosion, which can lead to the loss of topsoil and the exposure of subsoil. When subsoil is exposed, it can make it difficult for plants to grow, as subsoil often lacks the necessary nutrients and organic matter needed for plant growth. Furthermore, the heavy machinery used for clearing the land can cause soil compaction, which can also make it difficult for plants to grow. Compacted soil restricts the movement of air, water, and nutrients, which can stunt the growth of plants and reduce crop yields. Clearing land can also contribute to desertification, which is the process of fertile land becoming desert. Desertification occurs when soil erosion and other environmental factors deplete the soil of its nutrients and organic matter, making it impossible for plants to grow. In summary, while clearing agricultural lands of all vegetation and trees does not result in the complete removal of soil nutrients, it can have several other negative effects on the soil and the surrounding environment, including exposure of soil to erosion, compaction of soil, desertification, and exposure of subsoil.

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One of the ways by which a pasture cannot be improved is through over-grazing. Over-grazing occurs when too many animals are allowed to graze in a particular area, causing damage to the vegetation and soil, which can lead to a decline in pasture productivity. Therefore, over-grazing is not a viable method of improving a pasture. On the other hand, weed control, reseeding, irrigation, and fertilizer application are effective ways of improving a pasture. Weed control involves removing unwanted plants that compete with the desired pasture grasses for nutrients, water, and light. Reseeding involves planting new pasture grasses to improve pasture productivity and quality. Irrigation provides adequate water to the pasture grasses, especially during dry seasons, while fertilizer application provides essential nutrients to the pasture grasses, enhancing their growth and productivity. Overall, improving a pasture involves implementing best management practices that promote healthy soil, vegetation, and grazing management strategies to optimize the productivity and quality of the pasture.

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The type of soil recommended for pond foundation is clay. Clay soil is a fine-grained soil that is cohesive and has low permeability, meaning that it doesn't let water pass through easily. These qualities make it an ideal choice for pond foundation because it helps to retain water within the pond and prevent seepage. Silt and sandy loam soils are not recommended because they are more porous, which can lead to water loss and instability of the pond walls. Sandy clay can also lead to seepage and instability, whereas humus is not a soil type but rather a layer of organic material that can be found on top of soil and is not suitable for foundation purposes.

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The purpose of wildlife conservation is to protect and preserve wild animals and their habitats from being damaged or destroyed by human activities. This includes preventing the extinction of some wild animals, maintaining biodiversity, and promoting sustainable use of natural resources. Wildlife conservation also helps to maintain the delicate balance of ecosystems, which in turn benefits both wildlife and human beings. It is important to conserve wildlife to ensure that future generations can also enjoy the beauty and benefits of our natural world.

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When we consume foods containing beta-carotene, an orange-red pigment found in fruits and vegetables like carrots, sweet potatoes, and spinach, our body converts it into vitamin A. This conversion process happens in the small intestine and liver with the help of enzymes, and the resulting vitamin A is then used by our body for various functions like vision, immune system, and cell growth. Therefore, the correct answer is vitamin A.

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Gametes are produced through the process of meiosis. Meiosis is a special type of cell division that occurs in the reproductive cells of organisms. During meiosis, the parent cell divides twice, resulting in four daughter cells, each with half the number of chromosomes as the parent cell. This reduction in the number of chromosomes is important because when the gametes from two parents fuse during fertilization, the resulting zygote will have the correct number of chromosomes for the species. Therefore, meiosis is the process that allows sexual reproduction to occur and leads to genetic variation in offspring.

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The plant disease that is not caused by a fungus is cassava leaf-spot. Plant diseases can be caused by different agents such as fungi, bacteria, viruses, nematodes, and environmental factors. Fungi are one of the most common causes of plant diseases. Black arm, rice blast, rice smut, and maize rust are all fungal diseases that affect different plants. For example, rice blast is a fungal disease that affects rice plants causing lesions on the leaves, while maize rust is a fungal disease that affects maize plants causing yellow-orange pustules on the leaves. On the other hand, cassava leaf-spot is caused by a bacteria, not a fungus. This disease affects cassava plants, causing brown spots on the leaves which can eventually lead to defoliation and reduced crop yield. In summary, cassava leaf-spot is the only plant disease in the given list that is not caused by a fungus but by a bacteria.

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The marketing functions listed are activities involved in getting agricultural products from farmers to consumers. "Planting of crops" is not a marketing function because it involves the actual production of agricultural goods rather than the distribution and sale of those goods. The planting of crops is part of the production process and occurs before the marketing functions begin. To summarize, marketing functions include activities such as buying agricultural commodities, transporting farm produce, financing agricultural production, and storage of farm produce, but do not include planting of crops.

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Agricultural extension refers to an informal educational process that aims to teach farmers how to improve their farming activities and practices. It is a way of transferring information, knowledge, and technology from research institutions and universities to farmers in a practical and understandable way. The goal is to help farmers increase their productivity, income, and standard of living by adopting new and improved farming methods. Agricultural extension workers often work directly with farmers, providing them with advice, training, and support to help them achieve their goals.

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Genetic characteristics are passed from the parents to offspring through the gene. Genes are the basic units of inheritance that carry the instructions for the development and function of all living organisms. When a sperm cell from the father fertilizes an egg cell from the mother, they combine to form a single cell called a zygote. This zygote contains all the genetic information from both parents, which is then passed down to all the cells in the developing embryo through cell division. As the embryo grows and develops, the genetic information in the cells guides the formation of all the body's structures and functions. The umbilical cord and placenta are structures that connect the developing embryo to the mother's uterus during pregnancy, but they do not play a direct role in the transfer of genetic information from the parents to the offspring. The cytoplasm is the fluid inside cells, and while it plays an important role in many cellular processes, it does not contain genetic information that can be passed on to offspring.

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A stud bull is a term used to describe a male cattle that is kept mainly for breeding purposes. It is a fully matured and fertile bull that has been selected for its desirable genetic traits and used to mate with female cows to produce offspring with those same traits. Unlike a castrated male cattle or an immature male cattle, a stud bull is capable of producing offspring and is specifically bred and maintained for its breeding potential. Additionally, a stud bull is not used for draft purposes and may or may not be used for artificial insemination depending on the breeding practices of the farm or ranch where it is kept.

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The routine operations in cattle farming are important practices that help ensure the health and well-being of the animals. Among these operations, dehorning, castration, identification marking, and de-worming are commonly performed. Dehorning is the process of removing or preventing the growth of horns in cattle, which can be dangerous to both the animals and the people handling them. Castration is the removal of the testicles in male cattle to control their reproduction and improve their behavior. Identification marking is the use of tags, tattoos, or other means to identify individual animals for record-keeping, breeding, and management purposes. De-worming is the administration of medications to control internal parasites that can cause health problems in cattle. Shearing, however, is not a routine operation in cattle farming. It is more commonly associated with sheep farming and involves removing the wool from sheep for various reasons, such as for production of textiles. While cattle may be groomed or brushed for hygiene purposes, they do not typically require shearing as a regular practice.

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If a tree is planted for everyone felled, then trees for lumbering will be regularly available in Nigerian forests. This is because the process of planting a tree for every tree that is cut down ensures that the forest is replenished and new trees are constantly growing. This practice is called sustainable forestry, and it helps to ensure that forests are not depleted over time. It is important to note that while increasing rainfall and applying fertilizers may improve tree growth, these factors alone are not sufficient to guarantee a sustainable supply of lumber. Similarly, while reducing the use of timber for construction purposes and wood for fuel may help to reduce the demand for trees, it does not necessarily ensure a sustainable supply of lumber.

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The expenses of a complete farm enterprise record typically include several things, but one of the options listed above is not an expense that would typically be included. Let me explain: - A list of receipts and expenses by enterprise: This is a record of all the money coming in and going out of the farm, broken down by each enterprise (e.g. crops, livestock, etc.). This helps the farmer keep track of how much money they're making or losing on each enterprise. - A list of payable and receivable accounts: This is a record of all the money owed to the farm (receivables) and all the money the farm owes to others (payables). This helps the farmer keep track of their cash flow and make sure they're not falling behind on their bills. - Farm income statements: This is a summary of all the farm's income and expenses for a given period (e.g. a year), showing whether the farm made a profit or loss during that time. - A list of market centres: This is a list of places where the farm sells its products, such as farmers' markets or wholesalers. This helps the farmer keep track of their sales and identify which markets are most profitable. - An inventory: This is a record of all the farm's assets (e.g. land, buildings, equipment, livestock, etc.) and their value. This helps the farmer keep track of their net worth and make sure they have enough assets to cover their liabilities. So, as you can see, all of the options listed above except for "list of market centres" are expenses that a farmer would typically include in a complete farm enterprise record. A list of market centres is more of a record of sales outlets than an expense.

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Yes, the windmill is normally used as a source of power for pumping well water. This is because windmills are designed to harness the power of the wind and convert it into mechanical energy. The mechanical energy can then be used to turn a pump that can draw water up from underground wells. While windmills can be used for other purposes like grinding grains or powering other machinery, pumping well water is one of their most common uses. In areas with limited access to electricity or where traditional power sources are not available, windmills can be a reliable and sustainable solution for accessing groundwater.

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An area of land where fruit trees are cultivated is commonly called an "orchard". It is a place where various types of fruit trees, such as apple, pear, cherry, peach, and plum, are grown for their fruits. The orchard may also have other features such as irrigation systems, pest control measures, and pruning techniques to ensure the healthy growth of the fruit trees. The fruits produced in an orchard are harvested when they are ripe and can be sold fresh or processed into juices, jams, and other food products.

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The characteristic symptom of chlorosis, which is the yellowing of leaves along the veins, is often associated with a deficiency in magnesium. Magnesium is an essential nutrient for plant growth and plays a crucial role in the process of photosynthesis. Without enough magnesium, the plant is unable to produce enough chlorophyll, which gives leaves their green color. As a result, the leaves start to turn yellow, starting from the veins and spreading outwards. Other nutrients like nitrogen, potassium, phosphorus, and sulfur are also essential for plant growth and can cause different symptoms if deficient.

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The statement that is not correct about agricultural production is: "production is restricted to the availability of commodity only." Agricultural production is not only about the availability of commodities, but it also involves various stages such as planting, harvesting, processing, storage, transportation, marketing, and sales. The production process is not considered complete until the goods reach the final consumers. Furthermore, agricultural production involves the provision of services such as irrigation, pest control, and land preparation. These services are crucial for ensuring a high yield of crops and healthy livestock. Moreover, distribution, wholesale and retail trades are all part of agricultural production. These trades help to connect farmers with consumers and ensure that the goods are efficiently delivered to the market. Therefore, agricultural production is a comprehensive process that involves various stages, services, and trades, and it is not restricted to the availability of commodity only.

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If a soil has a low pH value, it means it's acidic, which can make it difficult for plants to grow in. One way to improve the soil is by adding a substance that can neutralize the acidity and raise the pH level. Out of the options given, the substance that can best achieve this is calcium carbonate. Calcium carbonate is a basic compound that can react with the acid in the soil, producing carbon dioxide gas and water. This reaction helps to reduce the acidity in the soil and make it more alkaline, which is better for plant growth. The other options, like ammonium sulphate, sodium chloride, sodium nitrate, and magnesium phosphate, may have other benefits for plant growth, but they won't have the same effect on soil acidity as calcium carbonate.

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The provision of food and employment opportunity is not a problem of agricultural development in Nigeria. Nigeria has a growing population, which creates a demand for food, and agriculture provides employment opportunities for millions of Nigerians. However, the other options listed are all significant challenges facing agricultural development in Nigeria: - Land tenure system: Nigeria's land tenure system is complex and lacks clarity, making it difficult for farmers to secure land tenure, access credit, and make long-term investments in their land. - Poor and fluctuating climatic conditions: Nigeria's agricultural sector is heavily reliant on rain-fed agriculture, making it vulnerable to changes in climate, such as droughts, floods, and other extreme weather events. - Poor storage facilities: Nigeria's inadequate storage facilities lead to post-harvest losses and reduce farmers' income. - Primitive production techniques: Many Nigerian farmers still use primitive production techniques, which limit their productivity, and make it difficult for them to compete in local and international markets.

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The natural grasslands of West Africa are generally located in the Guinea savanna. These savannas are characterized by tall grasses and scattered trees and are found in the central part of West Africa, stretching from Senegal to Cameroon. The sahel region to the north of the Guinea savanna is characterized by sparse vegetation and the equatorial region to the south has dense rainforest. The mangrove area is found along the coastlines, while the deciduous forest is found further inland.

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One disadvantage of battery cages is the production of eggs which cannot be hatched. This is because battery cages limit the natural behaviors of the hens such as nesting and laying eggs in a secluded area. The hens are confined to a small space and are unable to move around freely or even spread their wings. This often leads to stress and health problems for the hens, which can result in the production of eggs with weaker shells or other abnormalities. As a result, some of the eggs produced in battery cages may not be suitable for hatching.

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When making agricultural policies, the government aims to address all the principal factors involved in crop production. This means that the government seeks to develop policies that encompass all four of the options given, namely: controlling diseases, weeds, and pests; maintaining the quality of agricultural produce; conserving and preserving natural resources; and controlling soil erosion. By developing policies that address all four of these factors, the government hopes to create an environment in which farmers can produce high-quality crops efficiently and sustainably, while also protecting the natural resources upon which agriculture depends. Therefore, the combination of principles that the government aims at when making agricultural policies is I, II, III, and IV - controlling diseases, weeds, and pests; maintaining the quality of agricultural produce; conserving and preserving natural resources; and controlling soil erosion.

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