JAMB UTME - Agricultural Science - 2024

The type of soil with a particle size of 0.02 to 0.002 mm

Answer Details

The type of soil with a particle size ranging from 0.002 to 0.05 millimeters is known as silt. Soil particles are classified based on their sizes, and here is a brief explanation of other soil types for context:

• Clay: has very fine particles that are smaller than 0.002 millimeters. Clay particles are the smallest among soil types, creating a dense and sticky texture when wet.
• Silt: has slightly larger particles than clay, with sizes ranging from 0.002 to 0.05 millimeters. Silt feels smooth and floury to the touch and is less dense than clay.
• Fine Sand: consists of particles that are larger than silt, typically ranging from 0.05 to 0.2 millimeters. Fine sand has a gritty feel and allows water to drain through it more easily than silt or clay.
• Coarse Sand: contains even larger particles, generally ranging from 0.2 to 2 millimeters. It offers excellent drainage and is very gritty and rough to the touch.

In summary, silt describes soil with a particle size of 0.002 to 0.05 millimeters, making it distinct in its smooth texture and moderate drainage capacity.

The foot and mouth disease of cattle is caused by a

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The foot and mouth disease of cattle is caused by a virus. This particular virus is known as the Foot-and-Mouth Disease Virus (FMDV). It is a highly contagious viral infection that affects not only cattle but other cloven-hoofed animals like sheep, goats, and pigs. The disease is characterized by the development of blisters in the mouth and on the feet, leading to lameness and drooling.

The virus spreads rapidly among animals through direct contact, contaminated feed, and even the wind, making it challenging to control. Managing this disease involves strict biosecurity measures, vaccination programs, and sometimes culling infected animals to prevent further spread. Understanding that the cause is viral is crucial because it informs the strategies used for prevention and control, which differ significantly from those for diseases caused by bacteria, fungi, or nematodes.

Food shortage can be minimized by

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Food shortage is a significant issue that affects many parts of the world. One effective way to minimize food shortages is through the implementation of efficient pest control services. Pest control is critical because pests can destroy crops, leading to a substantial reduction in food supply. If pest populations are not managed, the damage to crops can be devastating, resulting in fewer yields. By using pest control services, farmers can protect their crops from insects, rodents, and other pests that threaten food production.

Here is a simple explanation of how efficient pest control can help minimize food shortages:

1. Protecting Crops: Efficient pest control services help in safeguarding plants from being consumed or damaged by pests. This means that more crops can be harvested and converted into food, helping to maintain an adequate food supply.

2. Improving Yield: When pest control measures are adopted, the quality and quantity of the harvest improve. Healthy crops mean more food can reach the market and consumers.

3. Promoting Sustainable Agriculture: By controlling pests efficiently, farmers can focus on sustainable farming practices rather than resorting to excessive chemical use. This approach not only protects the crops but also conserves the environment.

In conclusion, focusing on effective pest control is a key strategy in reducing food shortages. It plays a crucial role in protecting agricultural output, improving food quality, and ensuring that food supply remains stable and sufficient for the population.

New-born animals should be fed with colostrum because it

Answer Details

New-born animals should be fed with colostrum primarily because it contains antibodies that protect them against diseases. Colostrum is the first milk produced by the mother shortly after giving birth. This special milk is rich in antibodies and nutrients essential for the new-born's health.

Antibodies are proteins that can fight infections and boost the immune system. By consuming colostrum, new-born animals receive immediate protection against common diseases and infections they might encounter in the first days of their life. This early protection is crucial because new-borns are particularly vulnerable to illnesses until their own immune systems are more developed.

While colostrum is also easily digested and is the first milk produced before birth, the primary reason it is so vital for new-borns is the presence of these protective antibodies.

Air sacs are present in

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Air sacs are present in poultry, which includes birds like chickens, ducks, and turkeys. These air sacs are an essential part of the avian respiratory system. Unlike mammals, birds have a unique respiratory system that includes a series of air sacs that facilitate a continuous flow of air through their lungs. This system allows for more efficient gas exchange, which is crucial for their energy needs during activities like flying.

In more detail, when birds inhale, air doesn't just go into their lungs but also fills these air sacs. On the next exhalation, the air moves from the air sacs into the lungs, where oxygen is exchanged for carbon dioxide. This method ensures that the bird's lungs have a continuous supply of fresh air, both when they inhale and exhale.

Other animals listed, such as rabbits, goats, and cattle, have different respiratory systems without air sacs; they rely on diaphragm-based breathing similar to humans for their oxygen needs. The specialized respiratory system of birds thus gives them an advantage in terms of metabolic efficiency, which is particularly important given the energy demands of flying.

Which of the following defines agriculture?

Answer Details

Agriculture is best defined as the science and art of farming to satisfy human needs. This definition encompasses a broad range of activities that include both the cultivation of soil for growing crops and the raising of livestock. The concept of agriculture covers various aspects such as soil management, crop production, breeding, genetics, plant pathology, and more. It is both a science, because it involves understanding biological, chemical, and ecological processes, and an art, because it requires skill and expertise to effectively manage these processes to produce food and other resources needed by humans. Therefore, among the definitions provided, this one captures the full scope of what agriculture truly involves.

Government laws and reforms are aimed at

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Government laws and reforms in the agricultural sector are primarily aimed at increasing agricultural production. This is achieved through a variety of mechanisms, such as providing subsidies, implementing policies that support farmers, investing in agricultural research and technology, and ensuring access to resources like water and land. These efforts are designed to enhance the efficiency and productivity of agricultural activities. By increasing agricultural production, the government can ensure food security, reduce dependency on imports, and support the livelihood of farmers and related industries.

Which of the following processes does not lead to the physical disintegration of rock? 

Answer Details

The options provided refer to various processes that can affect rocks. To understand which process does not lead to the physical disintegration of rocks, let's explore each one clearly.

Expansion and contraction of rock minerals: This process refers to changes in the size of rock minerals due to temperature fluctuations. When minerals heat up, they expand, and when they cool down, they contract. Over time, this can cause the rock to crack and break apart. Therefore, this process does cause physical disintegration.

Formation of cracks and crevices in the rocks: This directly involves the breaking apart of rocks into smaller pieces due to the creation of openings or splits. Hence, it leads to physical disintegration.

Heating and cooling of rock surface: Rocks on the Earth's surface undergo cycles of heating during the day and cooling at night. These temperature variations cause the rock to expand and contract, similar to the effect on the rock minerals, eventually leading to cracking and breaking apart. Thus, this also causes physical disintegration.

Rapid cooling and solidification of rocks: This process typically refers to how molten rock (magma or lava) cools and hardens to form solid rock. When it cools rapidly, it solidifies quickly and forms a hard structure. This process does not involve breaking apart or physical disintegration of existing rock structures. Rather, it is about the formation of new rock. Therefore, this process does not result in the physical disintegration of rocks.

In conclusion, the process that does not lead to the physical disintegration of rock is the rapid cooling and solidification of rocks.

The provision of farm inputs to farmers by the government can best be described as

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The provision of farm inputs to farmers by the government can best be described as a subsidy.

A subsidy is a form of financial assistance given by the government to reduce the cost of products or services, making them more affordable for the public. When the government provides farm inputs such as seeds, fertilizers, and equipment at reduced costs or even for free, this helps farmers to lower their production costs. By doing so, farmers can produce agricultural goods more efficiently and affordably, leading to increased agricultural output and potentially lower prices for consumers.

Providing farm inputs as a subsidy can encourage agricultural productivity, support small-scale farmers, and boost the agricultural sector's overall growth and contribution to the economy. Unlike a loan or credit, which must be repaid, a subsidy does not require repayment, making it a direct form of assistance to farmers.

Which of the following group of crops can be attacked by smut diseases?

Answer Details

Smut diseases are caused by a group of fungi that primarily attack cereal crops. The infection leads to the formation of thick-walled and often black, sooty spores. The crops most affected by smut diseases are those in the grass family. These fungi often attack the grains or inflorescences of the plants, which can lead to significant agricultural losses.

Out of the given options, the crops rice, maize, and guinea corn are susceptible to smut diseases. Here's why:

• Rice: Known to be affected by diseases such as kernel smut.
• Maize (corn): Commonly affected by common corn smut (Ustilago maydis), which is noted for its gall formations on ears and kernels.
• Guinea corn (Sorghum): Can suffer from several smut diseases including covered smut, loose smut, and head smut.

Therefore, rice, maize, and guinea corn form the group of crops that can be attacked by smut diseases.

Wastage of agricultural products during the harvesting period is mainly due to inadequate?

Answer Details

Wastage of agricultural products during the harvesting period is primarily due to inadequate storage and processing facilities. Let's break this down:

When crops are harvested, they need to be properly stored to maintain their quality and prevent spoilage. Without adequate storage facilities, farmers may not be able to keep their produce under the right conditions, leading to deterioration. This is especially important for perishable products like fruits and vegetables, which can spoil quickly if not kept in cool, dry places.

Furthermore, processing facilities are crucial for handling agricultural products soon after harvesting. Processing can include cleaning, sorting, drying, or packaging produce, which helps extend its shelf life and makes it ready for market. Without these facilities, produce can quickly degrade, resulting in significant wastage.

In summary, having sufficient and efficient storage and processing facilities is key to reducing wastage of agricultural products during the harvest period. It ensures that produce maintains its quality and can reach consumers without spoilage.

Which of the following group of basic amenities should be provided in rural areas for improved agricultural productivity?

Answer Details

For improved agricultural productivity in rural areas, a specific set of basic amenities plays a crucial role. Let's consider each in detail:

• Water: It is essential for irrigation, which is fundamental to agriculture. Access to a reliable water supply helps ensure crops can be grown consistently, increasing agricultural output.
• Electricity: It facilitates the use of modern farming equipment and machinery, improves storage facilities for perishables, and enhances irrigation systems. This can drastically improve productivity and reduce labor costs.
• Health Care Centres: Ensuring farmers and agricultural workers remain healthy is vital for consistent productivity. Healthy workers are more efficient and can maintain the demanding physical labor often required in agriculture.

Hence, the combination of water, electricity, and health care centres is the most effective group of basic amenities to significantly improve agricultural productivity in rural areas. These provide the necessary infrastructure to support and sustain agricultural activities, thereby enhancing productivity and the overall quality of life in rural areas.

Although clay soil is rich in nutrients, they are not good for most agricultural crop production because

- They do not release their nutrients
- Are too compact
- Poorly aerated
- Contain too much iron, aluminum, and boron.
- Lose their nutrient too readily after rain.

Which of the above is most correct

Answer Details

Clay soil presents several challenges for agricultural crop production despite being rich in nutrients. One primary issue is that it often fails to release its nutrients effectively. The fine particles of clay hold onto nutrients too tightly, making it difficult for plant roots to absorb them. This means that although the nutrients are present, they are not always available to plants.

Another significant concern is that clay soil is too compact and poorly aerated. The tiny particles pack closely together, preventing air from circulating. This lack of aeration can lead to waterlogging, where plants cannot access oxygen needed for healthy root development. As a result, root systems can become weak and unable to support plant growth.

Additionally, clay soil may contain excessive amounts of iron, aluminum, and boron. While these elements are necessary in small quantities, their high levels can be toxic to plants, affecting their growth and development negatively.

Lastly, clay soil has a tendency to lose its nutrients readily after rain. Heavy rains can cause leaching, where water carries nutrients away from the root zone. Despite its nutrient richness, clay soil can become nutrient-deficient quickly after heavy rains, requiring frequent fertilization.

Overall, while clay soil is nutrient-rich, its composition and physical properties can significantly hinder crop production, making it less suitable for agriculture without proper management and amendment strategies.

Which of the following will not lead to loss of nitrogen compound from the soil?

Answer Details

Let's go through the processes listed one by one to determine which does not lead to the loss of nitrogen compounds from the soil:

Burning: When organic matter, such as plant material, is burned, the nitrogen within that material is released into the atmosphere in the form of gases, such as nitrogen oxides and ammonia. This process results in the loss of nitrogen from the soil.

Crop Removal: When crops are harvested, the nitrogen contained in plant tissue is removed from the field and, thus, from the soil. This is because the plants absorb nitrogen from the soil as they grow, and harvesting takes that nitrogen away.

Lodging: Lodging involves the bending or breaking of crop plants near the ground, often due to environmental factors like wind or rain. This does not result in the loss of nitrogen from the soil because the nitrogen compounds remain in the plants and soil. Lodged plants continue to interact with the soil ecosystem, allowing nitrogen to be recycled back into the soil.

Leaching: Leaching occurs when water percolates through the soil and dissolves soluble nutrients, including nitrogen compounds like nitrates, which are then carried away deeper into the soil or into water bodies. This process leads to the loss of nitrogen from the root zone of the soil.

In conclusion, lodging does not lead to the loss of nitrogen compounds from the soil. It merely results in the physical displacement of plants but does not remove or transform the nitrogen compounds in a way that results in their loss from the soil ecosystem.

Plant breeders aim at obtaining the following except

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Plant breeders are focused on improving the characteristics of plants to meet specific goals and demands. Here is an explanation of the aims listed, highlighting the one that is generally not a typical aim for breeders:

Adaptation to pollination: Plant breeders generally focus on adaptations that allow for more efficient pollination. This could involve traits that attract pollinators or improve the chances of successful fertilization.

Tolerance to climate extremes: A significant aim for breeders is to develop plants that can withstand adverse climate conditions like drought, frost, or extreme temperatures. This ensures that the plants can survive and produce fruits or seeds even under challenging environments.

Uniformity in the time of maturity: Breeders aim for uniform maturity so that the entire crop can be harvested at the same time, simplifying the harvesting process and improving efficiency.

Resistance to pests: This is a critical aim because it reduces the need for pesticides, lowers production costs, and increases yield by ensuring that plants are less susceptible to diseases and pest attacks.

The point that is generally not a focus of plant breeders is adaptation to pollination specifically in terms of adapting plants for their own pollination processes. While pollination is important, breeders are more focused on traits that enhance successful pollination rather than altering the plant to adapt specifically for that process.

Which of the following will not be affected by an excessive amount of water content in feeds?

Answer Details

In simple terms, when feed has too much water, it can cause several issues. Excessive water content can lead to a decrease in nutritive value because nutrients might wash out or break down. Furthermore, too much moisture can encourage the growth of molds, as they thrive in damp environments. This, in turn, can result in the formation of toxic products, which are dangerous for consumption.

However, there's one aspect that will not be affected: improving the quality of such feeds. In fact, excessive water typically does the opposite; it reduces quality rather than enhancing it, by risking spoilage and nutrient loss.

A characteristic feature of subsistence agriculture is

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Subsistence agriculture is a type of farming where the primary aim is to produce enough food to meet the needs of the farmer's family, with little or no surplus for sale in the market. A characteristic feature of subsistence agriculture is the reliance on the supply of labor by farm families. This means that the farm work is primarily done by the family members themselves, and there is minimal use of hired labor.

In subsistence agriculture, the farmers often use traditional farming methods and tools, making family labor essential for farming activities. Unlike commercial agriculture, which focuses on maximizing production for sale, subsistence farming is primarily about meeting the family's food needs. As a result, the decisions on what to plant and how much to produce are driven by the household's consumption needs rather than market demands.

Andropogon gayanus is commonly called

Answer Details

Andropogon gayanus is commonly called gamba grass.

The reason it is referred to as gamba grass stems from its characteristics and origin. Andropogon gayanus is a perennial grass species native to Africa, and it has been introduced to several other regions due to its usefulness as a cattle fodder because of its high biomass production and adaptability to different environments. Despite being beneficial for grazing, it can also become an invasive species in environments outside its native range. This characteristic name comes from its widespread and recognized use in agricultural and ecological contexts.

An accessory sex gland in bull is

Answer Details

The accessory sex gland in a bull is the prostate gland.

The reproductive system in mammals includes various glands that support reproduction. In male animals like bulls, the accessory sex glands play a crucial role in the reproductive process:

• Prostate Gland: This is an important accessory sex gland in male mammals, including bulls. It produces a fluid that forms part of the semen. This fluid helps nourish the sperm and facilitates its movement. The prostate gland is specifically part of the male reproductive system.
• Thyroid Gland: This gland is located in the neck and regulates the body's metabolism by controlling the release of thyroid hormones. It is not involved in the reproductive system.
• Pancreatic Gland: This gland has both endocrine and exocrine functions, helping in digestion and regulation of blood sugar through insulin production. It is unrelated to reproduction.
• Pituitary Gland: Often referred to as the "master gland," it is situated in the brain and controls various other glands but is not directly an accessory gland in the reproductive system.

As we can see, the only gland in this list that is directly related to the reproductive system of bulls is the prostate gland. Therefore, it is the correct answer when identifying the accessory sex gland in bulls.

The correct sequence of the components of a goat's stomach is

Answer Details

Goats, like other ruminants, have a unique digestive system adapted to break down fibrous plant material. Their stomach is divided into four compartments, each with specialized functions. Understanding the correct sequence of these compartments is crucial for comprehending how goats digest their food.

The correct sequence of a goat’s stomach is:

1. **Rumen**: This is the first and largest compartment. It serves as a fermentation vat where complex plant fibers are broken down by bacteria and other microorganisms. The rumen allows for the initial breakdown of food and is crucial for the digestion of cellulose found in plants.

2. **Reticulum**: Sometimes considered part of the rumen (together referred to as the reticulo-rumen), the reticulum works closely with the rumen. It traps foreign materials like small stones or metal objects and forms smaller food particles into cud, which are regurgitated back to the mouth for further chewing and digestion.

3. **Omasum**: This compartment acts as a filter. It absorbs water and minerals from the digested food and grinds the food particles further. The omasum has many folds, increasing its surface area to maximize absorption.

4. **Abomasum**: Known as the "true stomach," the abomasum is similar to a monogastric stomach (like in humans). It uses acids and digestive enzymes to break down proteins and complete the digestion process, preparing the food for intestines.

Thus, the correct sequence is rumen, reticulum, omasum, and abomasum.

Which of the following is not a characteristic of a good pasture?

Answer Details

In evaluating the characteristics of a good pasture, it is important to consider the elements that contribute to effective livestock grazing and growth. Let's go through each characteristic:

• Provision of balanced nutrients: A good pasture should provide a variety of nutrients essential for the growth, health, and productivity of livestock.
• High stem to leaf ratio: A high stem to leaf ratio is not a desirable characteristic in a good pasture. Ideally, a pasture should have a low stem to leaf ratio, meaning it should have more leaves than stems. Leaves are more palatable and nutritious for livestock compared to stems.


• High quality of grass: This means the grass should be nutritious and palatable, which contributes to the efficiency of feeding and overall health of the animals.
• Ability to withstand trampling: A good pasture has grasses that can endure the physical stress of being walked on by livestock, ensuring the pasture remains viable for longer periods.

Therefore, a high stem to leaf ratio is not a characteristic of a good pasture. It indicates fewer leaves, which are crucial for providing energy and nutrients to livestock.

Which of the following feedstuff does not contain phosphorus?

Answer Details

In the context of animal nutrition, it's crucial to distinguish the nutrient content of various feedstuffs. When considering phosphorus, which is an essential mineral for bones and other biological functions, it's important to identify feedstuffs based on their primary composition.

Limestone and oyster shell are primarily composed of calcium carbonate. They are often used in animal feeds to supplement calcium, not phosphorus. Both these materials are mainly known for their high calcium content and typically contain little to no phosphorus.

On the other hand, fish meal and blood meal are animal-derived feed components rich in proteins and generally contain phosphorus as part of their natural organic composition.

Therefore, the feedstuff that does not contain phosphorus among the options listed is limestone, since it primarily provides calcium and not phosphorus.

Gestation period is defined as the time

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The gestation period is defined as the period of time between conception and parturition. This means it is the duration from when an egg is fertilized by a sperm, leading to the formation of a fertilized egg, until the birth of the young animal. In humans, this period is typically about nine months. It is the time during which the embryo or fetus develops inside the mother's body, leading up to the birth.

Which of the following soil water is tightly held to the surface of the soil particles?

Answer Details

The type of soil water that is tightly held to the surface of soil particles is hygroscopic water.

Here is a simple explanation:

• Hygroscopic water is so strongly attracted to the surface of soil particles that it forms a very thin film around them. This layer of water is held by strong forces of attraction called adhesive forces.
• This type of water is not available to plants because it is held too tightly for plant roots to extract it.
• Hygroscopic water is always present on soil particles, and even under very dry conditions, a certain amount of it remains attached to the particles.

In contrast, the other types of soil water, like capillary water and gravitational water, are less tightly bound and more available to plants or can be drained away under the force of gravity.

The horizon of the soil profile that encourages the greatest level of microbial activity is

Answer Details

The soil profile consists of different layers, known as horizons, each having distinct characteristics. The horizon where the greatest level of microbial activity occurs is the A-horizon. Let me explain why this is the case in a simple and comprehensive way.

The A-horizon is also known as the topsoil. It is the uppermost layer of the soil and is rich in organic material. This horizon contains **humus**, which is decomposed organic matter, making it very fertile. The reasons why microbial activity is so high in the A-horizon are:

• Rich in Organic Matter: The presence of decomposed organic material provides an excellent source of nutrients, which encourages the growth and activity of microbes such as bacteria, fungi, and actinomycetes.
• Favorable Conditions: The topsoil is well aerated and has good moisture content, which creates an optimum environment for microbial life.
• Presence of Plants: The root systems of plants are primarily located in the A-horizon. Root exudates provide additional nutrients that benefit microbial activity.

Overall, the combination of abundant organic material and favorable living conditions supports robust microbial communities in the A-horizon, making it the layer with the greatest microbial activity.

The following are characteristics of quartz except

Answer Details

Quartz is a very common mineral, and some of its main characteristics include being glass-like in appearance and having a shiny surface. These properties are due to its ability to form into well-defined crystals that reflect and refract light. Additionally, quartz can appear granular when it is found in massive form, often forming compact, grain-like masses.

However, the characteristic that does not align with quartz is having cleavage. Cleavage in minerals refers to the tendency to break along smooth, flat surfaces, which is a property due to weaknesses in the mineral's structure. Unlike some minerals, quartz does not have cleavage. Instead, it exhibits a property known as conchoidal fracture, which means it breaks with curved, shell-like surfaces rather than smooth, flat planes.

In summary, the property that does not describe quartz is having cleavage, as quartz is known for its conchoidal fracture. The other characteristics such as being glass-like, shiny, and sometimes appearing granular are true descriptions of quartz.

When a piece of land is leased to a farmer, the land is said to be

Answer Details

When a piece of land is leased to a farmer, the land is said to be allocated on a rental basis.

Let me explain further:

Leasing is a common agreement where the owner of a property (in this case, the land) grants someone else (the farmer) the right to use that property for a specified period. This does not involve buying the land; instead, the farmer pays a regular fee, often called rent, to the landowner.

In this arrangement, the landowner retains ownership of the land, and the agreement usually includes terms such as duration, financial compensation, and specific uses of the land. At the end of the lease, the land typically returns to the owner's control unless the lease is renewed.

Thus, leasing involves the use of the land under a rental agreement, not purchasing it, receiving it as a gift, or as a subsidy.

One of the peculiarities of the intestine tract of a fowl is the possession of

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The intestinal tract of a fowl, like other avian species, has a peculiar feature known as the cloaca. This is a common cavity at the end of the digestive tract into which the intestinal, urinary, and reproductive tracts open. While many animals have separate openings for these systems, birds have a single opening called the cloaca.

The cloaca is a unique characteristic because it serves multiple functions. It receives waste from the intestines, urine from the kidneys, and eggs or sperm from the reproductive system. The cloaca then opens to the outside of the body, allowing the bird to excrete waste and reproduce.

This structure is different from mammals, which have separate systems for digestion, waste excretion, and reproduction. The cloaca is an efficient way for birds to streamline these processes, making it a distinctive and important feature of their anatomy.

A major symptom of onion/twister is

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A major symptom of onion/twister is the appearance of dark brown spots on leaves. Onion/twister is a disease that affects onion plants, causing the leaves to twist and curl

The factors that affect the number and the activities of soil micro-organisms include the following except

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When evaluating the factors that affect the number and activities of soil microorganisms, it's essential to understand how each factor influences their environment:

Soil Moisture: Water is crucial for the survival of microorganisms as it facilitates their metabolic processes and nutrient transfer. Soil moisture can significantly affect microbial activity and population. Too much or too little water can reduce microbial activity since it impacts their ability to respire and access nutrition.

Degree of Soil Acidity (pH): The pH level of soil affects the growth and diversity of microorganisms. Each microorganism has its preferred pH range, and extreme acidity or alkalinity can hinder their growth. Hence, the acidity of the soil plays a crucial role in determining the microbial population.

Soil Aeration: Oxygen availability is vital for the respiration of aerobic soil microorganisms. Good soil aeration ensures that oxygen can penetrate the soil, which supports aerobic microbial activity. Poorly aerated soils may favor anaerobic organisms but lower the overall microbial diversity and activity.

Topography: Contrary to the other factors, topography itself does not directly affect the number and activities of soil microorganisms. However, it can indirectly influence factors like moisture and temperature distribution across the landscape. The impacts of topography are often significant but are more mediated through secondary effects rather than being a direct factor influencing microbial numbers and activities.

In conclusion, while soil moisture, acidity, and aeration directly influence the presence and activity of soil microorganisms, topography primarily affects them indirectly through its effects on other environmental conditions.

Gummosis is caused by a

Answer Details

Gummosis is a condition that affects trees, particularly stone fruit trees like peaches, cherries, and plums. It is characterized by the excretion of sap or gum from wounds or cracks in the bark. The primary cause of gummosis is often related to stress factors, injuries, or infections. While gummosis can occur due to a variety of reasons such as physical damage or environmental stress, it is important to understand the role of different organisms in causing or exacerbating this condition.

In the context of organisms that could be involved, **fungal** and **bacterial** infections are the most common biological causes of gummosis. **Fungal** infections such as those caused by the fungi of the genus Botryosphaeria, are frequently associated with gummosis in trees. These fungi invade the tree through wounds or damaged areas and result in the production of gum as the tree attempts to isolate the infection.

Similarly, **bacterial** infections, particularly by bacteria in the genus Pseudomonas (for example, Pseudomonas syringae), can also lead to gummosis. These bacteria take advantage of wounds to enter the tree and cause gum formation as a response to the infection.

Although **nematodes** and **viruses** can negatively impact trees, they are not typically associated with causing gummosis. **Nematodes** are more likely to affect the root system, while **viruses** might cause other symptoms like leaf mottling or fruit deformities.

Thus, **the most common biological causes of gummosis are infections by fungi and bacteria**. When dealing with gummosis, it is essential to examine the possible presence of these pathogens and address any injuries or stress factors affecting the tree.

Which of the following livestock endoparasite is a hermaphmdite?

Answer Details

To determine which of the mentioned livestock endoparasites is a hermaphrodite, it's important to understand what a hermaphrodite is. A hermaphrodite organism has both male and female reproductive organs, allowing it to reproduce without needing a mate of the opposite sex.

For each parasite:

• Trypanosome: These are protozoan parasites that cause diseases like sleeping sickness in humans and animals. They reproduce primarily through asexual means and are not hermaphroditic.


• Roundworm: Many roundworms have separate sexes, meaning they're not hermaphrodites. They usually reproduce sexually and require individuals of opposite sexes to mate.


• Liverfluke: Liverflukes, such as those from the genus Fasciola, are indeed hermaphrodites. They have both male and female reproductive organs and can self-fertilize or cross-fertilize with others. This adaptation helps ensure their survival and reproduction even if isolated.


• Tapeworm: Tapeworms are also hermaphrodites. Each segment of a tapeworm (called a proglottid) contains both male and female reproductive organs. They can self-fertilize, although cross-fertilization between proglottids of the same or different worms can occur.

Therefore, in the context of your question, both liverfluke and tapeworm are hermaphrodites. However, if choosing only one as a typical example of a hermaphroditic endoparasite, both can be valid responses, but tapeworm is often more prominently recognized.

The alternate heating and cooling of rocks will result in

Answer Details

The **alternate heating and cooling of rocks** will primarily result in **fragmentation**. This process is commonly known as **physical weathering** or **mechanical weathering**.

Here's how it works:

• During the day, **rocks heat up due to sunlight**. This causes the outer layers of the rock to **expand**.
• At night, the **temperature drops**, causing the rock layers to **cool and contract**.
• This repeated process of expansion and contraction due to temperature changes creates **stress within the rock structure**.
• Over time, this stress causes the outer layers of the rock to **crack and break apart**, leading to **fragmentation** of the rock.

In contrast, the other processes listed involve different conditions:

• **Sublimation** refers to the direct transition of a substance from a solid to a gas, which is not relevant to rock weathering through temperature changes.
• **Solidification** involves the hardening of a substance from a liquid to a solid state, not fragmentation.
• **Molten magma** is formed under conditions of intense heat that melt rock into a liquid state, unrelated to the cooling process described above.

Thus, the **alternate heating and cooling of rocks** primarily results in their **fragmentation** into smaller pieces.

Which of the following statements is not correct about the land use act?

Answer Details

The Land Use Act is a policy that was enacted to manage and regulate land ownership and use. Here is an exploration of each statement:

• The government having control over unused land is a correct aspect of the Land Use Act, as it gives the government the power to allocate land based on its use and development priorities.
• The statement that land cannot be used for any purpose is incorrect. The Land Use Act actually allows land to be used for various purposes as long as it aligns with government policies and provides for economic and social development. Restrictions are only placed to ensure proper planning and sustainable use.
• Another objective of the Land Use Act is indeed the re-allocation of land for farming purposes among other uses to promote agricultural activities and boost food production.
• The Act is deliberately structured to prevent land fragmentation by consolidating land ownership to ensure optimal use and prevent the consequences of excessive subdivision.

Thus, the statement that land cannot be used for any purpose is the one that is not correct about the Land Use Act, as the Act actually facilitates multiple uses of land.

Igneous rocks formed within the crust are called

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Igneous rocks that form within the Earth's crust are called plutonic rocks. These rocks form when magma cools and solidifies slowly beneath the Earth's surface. Because of the slow cooling process, plutonic rocks typically have large, visible crystals. A common example of a plutonic rock is granite.

To better understand, imagine that magma is like a molten rock mixture. When it finds its way into the Earth's crust and cools down very slowly, it gives enough time for the crystals to grow large. This is different from volcanic rocks, which are formed when magma reaches the surface, cools quickly and forms smaller crystals.

Weed plants which grow on other plants without deriving nutrients from them are called

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Plants that grow on other plants but do not take nutrients from them are called epiphytes. Unlike parasites, which extract nutrients from their host plant, epiphytes simply use the host plant for physical support. This allows them to gain better access to light, air, and rainwater. Epiphytes are common in rainforests, where they grow on larger trees to reach sunlight. They have special adaptations, like aerial roots, to absorb moisture and nutrients from the air rather than relying on the soil.

The replacement of traditional farming methods with modern methods is a step in agricultural development

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The replacement of traditional farming methods with modern methods is indeed a step in agricultural development. Here's why:

Modern Methods refer to the use of advanced techniques, tools, and technologies in agriculture, such as tractors, genetically modified seeds, chemical fertilizers, and automated irrigation systems. These methods have several advantages:

• Increased Productivity: Modern methods lead to higher crop yields, which means more food can be produced with the same amount of land.
• Efficiency: The use of machinery and technology makes farming operations faster and less labor-intensive.
• Better Pest and Disease Management: Chemical fertilizers and pesticides help in protecting crops from pests and diseases, which otherwise would have reduced crop yields.
• Sustainability: Innovations like drip irrigation help in conserving water and ensuring that farming practices are environmentally sustainable.

By adopting these modern methods, farmers can not only maximize production but also ensure the sustainability and economic viability of their agricultural practices. This shift from traditional to modern methods represents a significant development in agriculture as it transforms the way farming is performed, leading to overall growth and efficiency in the agricultural sector.

Financial assistance from the government to the farmers is usually in the following forms except

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Financial assistance from the government to farmers generally comes in various forms. Let's explore each of them:

Subsidy: A subsidy is a financial support provided by the government to farmers. It helps in lowering the cost of agricultural inputs such as seeds, fertilizers, and machinery, making farming more affordable and sustainable. The aim is to enhance production and stabilize food prices.

Loans: Governments often provide loans to farmers at low interest rates. These loans help farmers invest in better equipment, seeds, and technology, which can improve productivity and reduce dependency on traditional methods.

Credit: Similar to loans, credit involves providing financial resources to farmers. It can be in the form of credit lines that farmers can draw from as needed, allowing them flexibility in managing cash flows for various farming needs.

Now, let's consider tax.

Tax is not a form of financial assistance; it is actually the opposite, as it involves the government collecting money from individuals and businesses. Taxes contribute to the government's revenue but do not directly assist farmers financially like subsidies, loans, or credit.

Therefore, among the options listed, tax is the exception as it is a form of financial obligation rather than assistance.

The roles of government in the development of agriculture include the following except

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The roles of government in the development of agriculture include many supportive activities aimed at enhancing the sector's productivity and sustainability. Here's an explanation of the options:

• Provision of subsidies: This is a typical role of the government. Subsidies are financial supports that help reduce the cost for farmers to encourage increased production and sustainability of agriculture. By providing subsidies on seeds, fertilizers, or equipment, the government assists farmers in maintaining profitability.


• Establishment of farm settlements: Governments often develop farm settlements to facilitate agricultural activities. Such settlements are planned communities where farmers can benefit from shared resources like water, electricity, storage facilities, and other essential infrastructure, making farming more efficient.


• Training of farmers: This is a vital governmental role; however, the emphasis is on training the farmers themselves and not specifically their children. Governments implement training programs to educate farmers on modern farming techniques, pest control, crop rotation, and efficient resource management.


• Recommending loans: Governments play a significant role in facilitating financial support systems like loans. They may not directly recommend loans but often work to ensure farmers have access to low-interest loans through agricultural banks or cooperative societies. This helps farmers invest in necessary resources to improve their farming operations.

In this context, the exception is the "training of farmers' children." While it is important to have educational programs available for future generations in agriculture, direct involvement in the training of farmers' children is not a typical, direct role of the government within the context of immediate agricultural development support.

Which of the following is an example of igneous rock?

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The correct answer is granite. Let me explain why:

Igneous rocks are formed from the cooling and solidification of magma or lava. They are one of the three main types of rocks, the other two being sedimentary and metamorphic rocks. Now, let’s briefly look at the options:

• Granite is a classic example of an igneous rock. It forms from the slow cooling of magma beneath the Earth’s surface, which allows large crystals to develop. This process gives granite its distinctive, coarse-grained texture.
• Sandstone is not an igneous rock. It is a sedimentary rock, formed from compacted sand-sized mineral particles or rock fragments.
• Limestone is also a sedimentary rock, primarily made of calcium carbonate, which originates from biological sources like shells or coral.
• Gneiss is a metamorphic rock, which means it forms from existing rocks that have been transformed by heat and pressure. It is characterized by its banding and does not originate from cooling magma or lava.

Therefore, based on the formation and characteristics, granite is the example of an igneous rock in the list.