WAEC SSCE - Agricultural Science - 2022 (Objective)
Pregunta 1 Informe
Soil-borne diseases could be controlled in the nursery by
Detalles de la respuesta
Soil-borne diseases are caused by pathogenic microorganisms that are present in the soil. These diseases can infect seedlings in the nursery and cause significant damage to crops. To control soil-borne diseases in the nursery, it is important to take preventive measures. One of the effective ways to control soil-borne diseases in the nursery is through heat treatment. Heat treatment involves exposing the soil to high temperatures to kill off the pathogenic microorganisms. Another method is to use sterilized soil or a soil-less growing medium, which can help prevent the buildup of disease-causing organisms. Providing proper drainage and ventilation in the nursery can also help to prevent the buildup of moisture, which can create conditions that are conducive to the growth of pathogens. Finally, good hygiene practices such as regularly cleaning tools and equipment used in the nursery can help prevent the spread of soil-borne diseases.
Pregunta 2 Informe
Detalles de la respuesta
Pregunta 3 Informe
Which of the following groups of crops will thrive in areas with high rainfall?
Detalles de la respuesta
The group of crops that will thrive in areas with high rainfall is Guinea corn, cowpea, and maize. This is because these crops are well adapted to the tropical climate, and can withstand the high humidity and rainfall associated with such areas. Additionally, they require high moisture content for good germination and growth. Cotton, cowpea, and groundnut, on the other hand, are crops that thrive better in semi-arid areas, where there is less rainfall. Millet, maize, and cotton can also be grown in areas with low to moderate rainfall, but may not do well in areas with high rainfall due to increased risk of fungal diseases and waterlogging. Cocoa, oil palm, and rubber are tree crops that are grown in areas with high rainfall, but they require specific conditions such as well-drained soils and specific climatic conditions to thrive.
Pregunta 4 Informe
The diagram below illustrates a farm implement. Use it to answer this question.
The part of the illustrated farm implement which enables it to roll over obstacles is labelled
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Pregunta 5 Informe
The table below illustrates a farm record for Goodness Farms in the year 1970. Use it to answer this question.
| DATE | NUMBER OF HENS |
TOTAL EGGS COLLECTED |
TOTAL EGGS SOLD |
| 4th June | 362 | 176 | 96 |
| 5th June | 360 | 199 | 108 |
| 6th June | 360 | 177 | 48 |
The table illustrates
Detalles de la respuesta
The table illustrates a production record for Goodness Farms in the year 1970. This is because it records the number of hens on the farm and the total eggs collected and sold over a period of three days. A production record is used to keep track of the amount of output or yield produced on a farm within a specific period. Therefore, this table is an example of a production record because it records the number of eggs produced and sold within a specific period.
Pregunta 6 Informe
The establishment of cooperative farming is encouraged by governments because it
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Pregunta 7 Informe
Decomposition of soil organic matter is mainly caused by
Detalles de la respuesta
Decomposition of soil organic matter is mainly caused by bacteria. Bacteria are single-celled microorganisms that are ubiquitous in soil and are responsible for breaking down complex organic matter into simpler forms. They play a vital role in the cycling of nutrients in soil ecosystems. When organic matter is added to soil, bacteria break down the complex molecules into smaller molecules such as sugars, amino acids, and fatty acids, which can then be used by plants for growth and development. Bacteria also help to release nutrients from organic matter into the soil, making them available for plant uptake. Without bacteria, organic matter would accumulate in the soil and become unavailable for plant growth.
Pregunta 8 Informe
The table below illustrates a farm record for Goodness Farms in the year 1970. Use it to answer this question.
| DATE | NUMBER OF HENS |
TOTAL EGGS COLLECTED |
TOTAL EGGS SOLD |
| 4th June | 362 | 176 | 96 |
| 5th June | 360 | 199 | 108 |
| 6th June | 360 | 177 | 48 |
Calculate the total amount of eggs sold on the farm.
Detalles de la respuesta
To calculate the total amount of eggs sold, we need to add up the number of eggs sold on each day. According to the table, on the 4th of June, 96 eggs were sold, on the 5th of June, 108 eggs were sold, and on the 6th of June, 48 eggs were sold. Therefore, the total amount of eggs sold is 96 + 108 + 48 = 252. So, the correct option is 252.
Pregunta 9 Informe
Ranging poles used in farm surveying have characteristic
Detalles de la respuesta
Ranging poles used in farm surveying typically have red and white bands. This is because the high contrast between the red and white bands makes the poles highly visible even from a distance. The poles are used to mark the boundaries and reference points in the field, and their visibility is important for accurate measurements and mapping. The use of red and white bands is a standard practice in surveying and is recognized internationally.
Pregunta 10 Informe
Use the information below to answer this question.
I. Yellowing of leaves
II. Raised brown spots on the leaves
III. Drying up of leaves
IV. Exudation of gum
The disease of citrus described above is
Detalles de la respuesta
The disease of citrus described above is gummosis. This is because one of the symptoms mentioned is the exudation of gum, which is a characteristic symptom of gummosis. Yellowing of leaves, raised brown spots on the leaves, and drying up of leaves are not typically associated with gummosis, but can be symptoms of other citrus diseases. Blight and tristeza are also citrus diseases, but they do not typically cause gum exudation as a symptom.
Pregunta 11 Informe
Water can be conserved in the soil by
Detalles de la respuesta
Water can be conserved in the soil through various management practices that aim to reduce evaporation and runoff, and increase infiltration and water holding capacity. Mulching, strip cropping, and cover cropping are among the best ways to conserve water in the soil. Mulching involves covering the soil with organic or inorganic materials such as leaves, straw, or plastic, which reduces water loss due to evaporation and helps retain moisture in the soil. Strip cropping involves alternating strips of crops or cover crops with fallow land or other crops, which reduces runoff and erosion, and improves water infiltration and soil structure. Cover cropping involves planting a cover crop that can hold water in the soil, reduce evaporation, and improve soil health. By implementing these practices, water can be conserved in the soil, which is important for sustainable agriculture and the efficient use of water resources.
Pregunta 12 Informe
The diagram below illustrates the digestive system of a farm animal. Use it to answer this question.
The part labelled lll is the
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Pregunta 13 Informe
The diagram below illustrates a tool used to analyse a soil sample in an experiment. Use it to answer this question.
The diameter of the soil particle that would be retained in the part labelled II is
Detalles de la respuesta
The tool in the diagram is a sieve, and the part labelled II is the mesh size of the sieve. The mesh size determines the diameter of the soil particle that can pass through it. So, the diameter of the soil particle that would be retained in the part labelled II is the size range of the mesh, which is 0.02 - 0.2 mm. Therefore, the answer is the second option: 0.02 - 0.2 mm.
Pregunta 14 Informe
The diagram below illustrates the digestive system of a farm animal. Use it to answer this question.
Digestion of fats takes place in the part labelled
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Pregunta 15 Informe
Removal of needle teeth is important in the management of
Detalles de la respuesta
The removal of needle teeth is important in the management of piglets. Piglets are born with needle-like teeth that can cause injuries to the sow's udder and to other piglets during nursing. These teeth can also cause damage to the piglets' mouth, making it difficult for them to feed and thrive. The removal of needle teeth is therefore important to promote the health and well-being of the piglets, as well as to prevent injuries to the sow and other piglets in the litter. It is usually done within the first few days after birth, using specialized clippers or a hot iron cautery.
Pregunta 16 Informe
The diagram below illustrates the digestive system of a farm animal. Use it to answer this question.
The diagram illustrates the digestive system of a
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Pregunta 17 Informe
Use the information below to answer this question.
In an experiment on soil porosity, the following results were obtained:
Volume of dry soil = 52cm³
Volume of water= 48cm³
Volume of soil and water=78cm³
Calculate the porosity of the soil sample
Detalles de la respuesta
Pregunta 19 Informe
The table below illustrates a farm record for Goodness Farms in the year 1970. Use it to answer this question.
| DATE | NUMBER OF HENS |
TOTAL EGGS COLLECTED |
TOTAL EGGS SOLD |
| 4th June | 362 | 176 | 96 |
| 5th June | 360 | 199 | 108 |
| 6th June | 360 | 177 | 48 |
If all the unsold eggs were later sold on 7th June at ₦5.00 per crate, calculate the income from unsold eggs. (Assuming a crate = 30 eggs)
Detalles de la respuesta
To calculate the income from unsold eggs, we need to first find out the total number of unsold eggs. To do that, we add up the total eggs collected and subtract the total eggs sold for each day: Total eggs collected = 176 + 199 + 177 = 552 Total eggs sold = 96 + 108 + 48 = 252 Total unsold eggs = 552 - 252 = 300 Next, we need to find out how many crates the unsold eggs make by dividing the total number of unsold eggs by 30: Number of crates of unsold eggs = 300 ÷ 30 = 10 Finally, we can calculate the income from the unsold eggs by multiplying the number of crates by the price per crate: Income from unsold eggs = 10 x ₦5.00 = ₦50.00 Therefore, the answer is option (C) ₦50.00.
Pregunta 20 Informe
The gross profit of a farm business is the farm's
Detalles de la respuesta
The gross profit of a farm business is the total revenue generated by the farm from its sales minus the total cost of production. It represents the amount of money left over after deducting all direct costs associated with producing and selling the goods, before taking into account any overhead or indirect costs. Therefore, the correct answer is "total sales less cost of production."
Pregunta 21 Informe
Lactation normally occurs
Detalles de la respuesta
Lactation normally occurs after gestation. It is a natural physiological process that occurs in most female mammals after giving birth. During gestation, the mammary glands prepare for milk production, and once the offspring is born, the hormone prolactin is released, which stimulates milk production. This process continues as long as the offspring continues to nurse. Therefore, lactation is an important aspect of post-natal care and is essential for the survival and growth of the offspring.
Pregunta 23 Informe
Capping is a cultural practice carried out in the cultivation of
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Pregunta 24 Informe
The correct order of arrangement of ration for piglets from day old is
Detalles de la respuesta
The correct order of arrangement of ration for piglets from day old is: creep > weaners > growers > finisher. This is because piglets require different levels of nutrients and energy at different stages of their growth. The creep feed is provided to piglets during the nursing period, usually starting at around 3 weeks of age. After weaning, the piglets are fed with weaner feed, which has a higher protein content to aid in their growth and development. As they continue to grow, they are then given growers feed, which contains the necessary nutrients for optimal growth. Finally, as the pigs reach finishing weight, they are provided with finisher feed which is high in energy and designed to add more fat to the pig's body.
Pregunta 25 Informe
The most common way of controlling weeds in tree crop plantations is by
Detalles de la respuesta
Weed control is essential for the healthy growth of trees in plantations. One of the most common ways to control weeds in tree crop plantations is by slashing. Slashing involves using a machete or a special tool to cut down the weeds at their base. This method is effective because it cuts off the weed's supply of nutrients and light, which eventually leads to their death. Slashing is relatively inexpensive and does not require the use of harmful chemicals that could be dangerous to the environment or human health. It is also less labor-intensive compared to hand-pulling weeds, especially in large plantations.
Pregunta 26 Informe
A difference between physical and chemical weathering is that
Detalles de la respuesta
Physical weathering and chemical weathering are two different processes that break down rocks into smaller particles. Physical weathering breaks down rocks into smaller pieces without altering the chemical composition of the rock, while chemical weathering changes the composition of rocks by altering the minerals or chemicals that make up the rock. Therefore, the correct answer is: "the mineral composition of rock is changed in chemical weathering."
Pregunta 27 Informe
The practice of placing the correct number of seeds in the soil with definite intra-row and inter-row spacing is called
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Pregunta 28 Informe
A combine harvester can be used simultaneously to harvest
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Pregunta 29 Informe
If 200 layers require 25 kg of layer mash per day, calculate the quantity of feed required by 1,000 layers per day.
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Pregunta 31 Informe
Swampy lands are most suitable for growing
Detalles de la respuesta
Swampy lands are most suitable for growing rice. This is because rice thrives in wetland environments where there is abundant water supply. Swampy lands usually have a high water table and can retain moisture for a long time, making them ideal for the cultivation of rice. Additionally, rice is a semi-aquatic crop that can tolerate flooding, making it well-suited for growing in areas with fluctuating water levels. Therefore, rice is the most suitable crop to grow in swampy lands.
Pregunta 32 Informe
A non-governmental organization involved in agricultural development in West Africa is
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Pregunta 33 Informe
Use the information below to answer this question.
In an experiment on soil porosity, the following results were obtained:
Volume of dry soil = 52cm³
Volume of water= 48cm³
Volume of soil and water=78cm³
Determine the volume of airspace in the soil sample.
Detalles de la respuesta
Pregunta 34 Informe
The main reason for castrating farm animals is to
Detalles de la respuesta
Castration is the surgical removal or destruction of the testicles of male farm animals, such as bulls, rams, and boars. The main reason for castrating farm animals is to make them sterile, that is, unable to reproduce. This is often done to control breeding, reduce aggression, and improve meat quality. Castrated animals also tend to grow faster and produce leaner meat, which is why it can indirectly lead to increased meat production. The removal of the testicles also causes a reduction in testosterone levels, which can lead to a decrease in male odour and potentially result in a loss of weight.
Pregunta 35 Informe
Potassium deficiency in cereal crops Is indicated by
Detalles de la respuesta
Potassium is an essential nutrient for the growth and development of cereal crops. When there is a deficiency of potassium, it can be indicated by browning of leaves from the tips and margins. The leaves may also become weak and susceptible to disease and pests. This is because potassium helps in the regulation of plant water balance and strengthening of cell walls. Therefore, a lack of potassium can lead to water stress and weaker cell walls, causing the leaves to turn brown and die. Yellowing of younger leaves is not usually associated with potassium deficiency but rather with other nutrient deficiencies such as nitrogen. Purpling of leaves can be a sign of phosphorus deficiency. White and irregular spots on leaves can be caused by fungal or bacterial infections.
Pregunta 36 Informe
The main factors responsible for rock weathering in the desert are high temperature and
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Pregunta 37 Informe
If maize seeds are sown at a spacing of 60 cm by 90 cm, what is the plant population of maize expected on one hectare of farmland?
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Pregunta 38 Informe
Monocotyledonous crops include
Detalles de la respuesta
Monocotyledonous crops are plants that have one cotyledon (seed leaf) in their embryo. Some common examples of monocotyledonous crops include rice, maize, wheat, barley, sorghum, sugarcane, bamboo, and grasses like Bermuda and Bluegrass. Therefore, the correct option from the given choices is "oil palm, rice, and plantain".
Pregunta 39 Informe
Which of the following farm animals will browse more on plants in a pasture?
Detalles de la respuesta
Goats will browse more on plants in a pasture compared to other farm animals. Browsing refers to the act of feeding on bushes and trees above the ground level. Goats have a natural inclination to browse as they prefer to eat leaves, twigs, and small branches. In contrast, cattle, pigs, and sheep are mainly grazers and prefer to eat grass that is close to the ground. While all four animals will eat a variety of plants, goats are more likely to browse on a wider range of plants, making them useful for controlling weeds and managing vegetation in pastures.
Pregunta 40 Informe
Which of the following statements about silage are true?
I. It has a laxative effect
II. is acidic in reaction.
III. has a strong aroma when well prepared
Detalles de la respuesta
Pregunta 42 Informe
Which of the following crops is correctly matched with a disease that affects it?
Detalles de la respuesta
The correct match between a crop and a disease that affects it is: - Maize - smut Smut is a fungal disease that affects maize plants. It causes the formation of large, black, powdery masses on the ears, tassels, leaves, and stems of the plant. The masses contain millions of fungal spores that can be spread by wind, rain, and insects to other plants. Smut can reduce the yield and quality of maize crops, and infected plants should be removed and destroyed to prevent the disease from spreading. The other options are incorrect matches between crops and diseases: - Sorghum - scab (scab is a disease that affects wheat and barley) - Rice- black arm (black arm is a disease that affects cotton) - Yam- blast (blast is a disease that affects rice)
Pregunta 44 Informe
The diagram below illustrates a farm implement. Use it to answer this question.
The function of the part labelled II is to
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Pregunta 45 Informe
Nitrogen is important in plants because it is mainly needed in
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Pregunta 46 Informe
The diagram below illustrates a tool used to analyse a soil sample in an experiment. Use it to answer this question.
The aim of the experiment is to determine the soil
Detalles de la respuesta
Based on the diagram provided, the aim of the experiment is to determine the soil texture. Soil texture refers to the relative proportion of different particle sizes in soil, such as sand, silt, and clay. The tool shown in the diagram is a soil texture analysis apparatus, commonly known as a hydrometer, which measures the rate of settling of suspended soil particles in water. The time taken for different-sized particles to settle can be used to calculate the proportions of sand, silt, and clay in the soil sample, which in turn determines its texture.
Pregunta 47 Informe
The diagram below illustrates a farm implement. Use it to answer this question.
The illustrated farm implement i used for
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