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Pregunta 1 Informe
A major symptom of onion/twister is
Detalles de la respuesta
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
Pregunta 2 Informe
Which of the following will not be affected by an excessive amount of water content in feeds?
Detalles de la respuesta
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.
Pregunta 3 Informe
In the nitrogen cycle , nitrite is oxidized to nitrate by
Detalles de la respuesta
In the nitrogen cycle, the conversion of nitrite into nitrate is an important step. This process is known as nitrification. Nitrification is carried out by specific types of bacteria found in soil and water environments. The bacteria responsible for this transformation are primarily of the genus called Nitrobacter.
Nitrobacter bacteria play a crucial role by taking nitrite (NO2-), which is a less stable and less usable form of nitrogen for most plants, and converting it into nitrate (NO3-), which is a more stable and accessible form of nitrogen for plant uptake. This step is crucial because it makes nitrogen available in a form that can be easily absorbed by plants, thus supporting plant growth and development.
In summary, Nitrobacter are the bacteria responsible for oxidizing nitrite to nitrate in the nitrogen cycle.
Pregunta 4 Informe
One of the peculiarities of the intestine tract of a fowl is the possession of
Detalles de la respuesta
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.
Pregunta 5 Informe
Wastage of agricultural products during the harvesting period is mainly due to inadequate?
Detalles de la respuesta
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.
Pregunta 6 Informe
Plant breeders aim at obtaining the following except
Detalles de la respuesta
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.
Pregunta 7 Informe
The roles of government in the development of agriculture include the following except
Detalles de la respuesta
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:
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.
Pregunta 8 Informe
The correct sequence of the components of a goat's stomach is
Detalles de la respuesta
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.
Pregunta 9 Informe
Gummosis is caused by a
Detalles de la respuesta
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.
Pregunta 10 Informe
The foot and mouth disease of cattle is caused by a
Detalles de la respuesta
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.
Pregunta 11 Informe
The diagram above illustrates a reproductive process in a farm animal, study the process and answer the questions.
Which word best describes the process depicted by the diagram?
Detalles de la respuesta
To explain this reproductive process comprehensively, let's break down each term and how it fits into the reproductive cycle of a farm animal.
Gestation: This is the period during which a female animal carries a developing embryo or fetus inside her body. In farm animals, gestation varies depending on the species. For example, the average gestation period for cows is about nine months, while for pigs it's around three months. During this phase, the female's body supports the developing young until birth.
Heat: Otherwise known as estrus, this is the period when a female animal is receptive to mating. It is part of the estrous cycle and signals that ovulation is about to occur. *During this time, the female exhibits specific behavioral changes that attract the male animal for breeding.
Ovulation: This is the process when the female's ovary releases an egg or ovum. It is a critical stage in the reproductive cycle because it's the time when fertilization by the male's sperm can occur. **Ovulation is timed with the heat period, making conception possible.**
Lactation: This is the period following birth during which a female animal produces milk. Lactation is essential for the nourishment and growth of the newborn. In many farm animals, lactation starts after parturition (birth) and continues for several months, providing the necessary nutrients for the offspring's development.
In conclusion, the reproductive process in farm animals involves a sequence of stages: **the female comes into heat and ovulates, potentially leading to conception.** If the egg is fertilized, the gestation period follows, culminating in birth, after which lactation begins to provide for the newborn. Each stage is meticulously timed and crucial for successful reproduction.
Pregunta 12 Informe
New-born animals should be fed with colostrum because it
Detalles de la respuesta
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.
Pregunta 13 Informe
Which of the following is not correct about the importance of agriculture?
Detalles de la respuesta
Agriculture is fundamentally vital to many aspects of human society and the economy. Let's explore how the given points pertain to the importance of agriculture:
Provision of Raw Materials for Agro-Based Industries: Agriculture supplies essential raw materials like cotton, jute, sugarcane, and rubber that are crucial for various industries. This makes it an important backbone for industrial operations.
Serving as a Main Source of Foreign Exchange: Agricultural products such as coffee, cocoa, tea, and spices are often exported globally. This means agriculture is a significant contributor to foreign exchange earnings, helping stabilize economies, especially in developing countries.
Supply of Food: One of the fundamental roles of agriculture is to provide food for human consumption. It is the primary source of sustenance for the global population, making it an indispensable element for food security.
Provision of Employment: Agriculture is a major employment sector worldwide. It provides jobs for millions of people, particularly in rural areas, contributing significantly to livelihoods and income generation.
The point that is not correct in highlighting the importance of agriculture from a different context would depend on the wider economic and geographical setting, but generally, all stated points are commonly acknowledged as essential roles played by agriculture.
Pregunta 14 Informe
An accessory sex gland in bull is
Detalles de la respuesta
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:
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.
Pregunta 15 Informe
Which of the following defines agriculture?
Detalles de la respuesta
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.
Pregunta 16 Informe
The factors that affect the number and the activities of soil micro-organisms include the following except
Detalles de la respuesta
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.
Pregunta 17 Informe
Gneiss is a metamorphic rock formed from?
Detalles de la respuesta
Gneiss is a type of metamorphic rock that primarily forms from the metamorphism of granite. Let's break this down to understand it better.
Metamorphic rocks are formed when existing rocks are subjected to high heat, high pressure, or chemically active fluids. This process, known as metamorphism, alters the mineral composition and structure of the original rock, also known as the parent rock or protolith.
Granite is an igneous rock composed mainly of quartz, feldspar, and mica. When granite undergoes metamorphism, typically deep within the Earth's crust where pressures and temperatures are high, it changes into a different kind of rock.
The specific conditions cause the minerals within the granite to align into bands or layers, giving gneiss its characteristic banded appearance. This banding is called "foliation."
While other types of rocks like slate, shale, and sandstone can also undergo metamorphism, they result in different metamorphic rocks. For instance:
In summary, gneiss is primarily the result of the metamorphism of granite.
Pregunta 18 Informe
When a piece of land is leased to a farmer, the land is said to be
Detalles de la respuesta
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.
Pregunta 19 Informe
Government laws and reforms are aimed at
Detalles de la respuesta
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.
Pregunta 20 Informe
A characteristic feature of subsistence agriculture is
Detalles de la respuesta
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.
Pregunta 21 Informe
Which of the following livestock endoparasite is a hermaphmdite?
Detalles de la respuesta
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:
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.
Pregunta 22 Informe
The alternate heating and cooling of rocks will result in
Detalles de la respuesta
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:
In contrast, the other processes listed involve different conditions:
Thus, the **alternate heating and cooling of rocks** primarily results in their **fragmentation** into smaller pieces.
Pregunta 23 Informe
Gestation period is defined as the time
Detalles de la respuesta
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.
Pregunta 24 Informe
Air sacs are present in
Detalles de la respuesta
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.
Pregunta 25 Informe
The type of soil with a particle size of 0.02 to 0.002 mm
Detalles de la respuesta
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:
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.
Pregunta 26 Informe
Which of the following is an example of igneous rock?
Detalles de la respuesta
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:
Therefore, based on the formation and characteristics, granite is the example of an igneous rock in the list.
Pregunta 27 Informe
Which of the following is not a characteristic of a good pasture?
Detalles de la respuesta
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:
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.
Pregunta 28 Informe
Which of the following feedstuff does not contain phosphorus?
Detalles de la respuesta
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.
Pregunta 29 Informe
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
Detalles de la respuesta
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.
Pregunta 30 Informe
The main aim of wildlife management is to
Detalles de la respuesta
The **main aim** of wildlife management is to prevent the extinction of species. Wildlife management involves the practices and strategies aimed at sustaining healthy animal populations and habitats. This field of study ensures that animal species do not disappear from our planet by addressing factors such as habitat degradation, overhunting, and the effects of climate change.
Conservation efforts focus on maintaining ecological balance and biodiversity, which is critical for the survival of numerous species. By protecting and managing wildlife and their habitats, we not only prevent species extinction but also sustain ecosystems that support all forms of life.
While concepts such as providing protein, controlling parasites, and generating income from wildlife might be related goals, they are not the primary focus. The ultimate objective of wildlife management is the conservation of biodiversity, ensuring that species continue to thrive for future generations.
Pregunta 31 Informe
A biotic factor influencing agricultural production is
Detalles de la respuesta
A **biotic factor** influencing agricultural production is a **predator**. Biotic factors are those that are living components in an ecosystem. In agriculture, predators, which include animals such as insects, birds, and mammals, can significantly affect crop yields. They influence the farming ecosystem by feeding on crops or on organisms that are beneficial or harmful to crops.
For instance, some predators might eat pests that could otherwise damage the plants, thereby indirectly helping in the production process. On the other hand, certain predators may attack the crops themselves, reducing yields. Therefore, understanding and managing **predator populations** is crucial in agricultural production to ensure crops are protected and can grow optimally.
Pregunta 32 Informe
The water-snail is important in the life cycle of
Detalles de la respuesta
The water-snail is important in the life cycle of the liver fluke. Liver flukes are parasitic flatworms that cause a disease called fascioliasis in the liver of various mammals, including humans, cattle, and sheep.
Here is a simple explanation of how the water-snail fits into the liver fluke's life cycle:
1. Egg Stage: The adult liver fluke lives in the host's liver and produces eggs, which are excreted in the host's feces.
2. Miracidium Stage: These eggs hatch in a water environment into larval forms called miracidia.
3. Snail Host: The miracidia must find and penetrate a specific species of freshwater snail. The water-snail serves as the intermediate host where the liver fluke undergoes a significant part of its development.
4. Sporocyst, Rediae, and Cercariae Stages: Inside the snail, the liver fluke develops through several stages: sporocysts, rediae, and cercariae.
5. Free-swimming Cercariae: The cercariae leave the snail and enter the water, seeking to attach to aquatic plants or other surfaces.
6. Metacercariae on Plants: The cercariae encyst to form metacercariae on these plants, waiting to be ingested by the next mammalian host.
Thus, the water-snail plays a crucial role as an intermediate host, enabling the fluke to transform into forms that are ready to infect mammals. Without the snail, the liver fluke's life cycle cannot continue.
Pregunta 33 Informe
The horizon of the soil profile that encourages the greatest level of microbial activity is
Detalles de la respuesta
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:
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.
Pregunta 34 Informe
The most active agent of physical weathering in arid legions is
Detalles de la respuesta
In arid regions, the most active agent of physical weathering is wind.
Arid regions, known for their dry climates and minimal vegetation, provide ideal conditions for wind to actively erode and weather the landscape. Here's how it works:
Although temperature, water, and ice can also contribute to physical weathering, wind is particularly significant in arid regions due to its persistence and effectiveness in altering the landscape without the need for much moisture.
Pregunta 35 Informe
Which of the following soil water is tightly held to the surface of the soil particles?
Detalles de la respuesta
The type of soil water that is tightly held to the surface of soil particles is hygroscopic water.
Here is a simple explanation:
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.
Pregunta 36 Informe
Food shortage can be minimized by
Detalles de la respuesta
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.
Pregunta 37 Informe
The replacement of traditional farming methods with modern methods is a step in agricultural development
Detalles de la respuesta
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:
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.
Pregunta 38 Informe
Which of the following group of basic amenities should be provided in rural areas for improved agricultural productivity?
Detalles de la respuesta
For improved agricultural productivity in rural areas, a specific set of basic amenities plays a crucial role. Let's consider each in detail:
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.
Pregunta 39 Informe
Which of the following group of crops can be attacked by smut diseases?
Detalles de la respuesta
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:
Therefore, rice, maize, and guinea corn form the group of crops that can be attacked by smut diseases.
Pregunta 40 Informe
The replacement of traditional farming methods with modern methods is a step in agricultural
Detalles de la respuesta
The replacement of traditional farming methods with modern methods is a step in agricultural development. This is because development involves improving and advancing the way things are done to increase efficiency, productivity, and sustainability. By introducing modern methods, farmers can benefit from higher yields, better resource management, and improved quality of agricultural products.
Modern agricultural methods include the use of advanced technology such as tractors, automated machinery, and precision farming tools, as well as techniques like genetic modification and advanced irrigation systems. These methods help to optimize the use of resources, reduce the time and labor needed, and minimize environmental impact.
Traditional methods, on the other hand, often rely on manual labor and are subject to limitations such as low yields, more susceptibility to pests, and inefficient use of resources. By adopting modern techniques, agriculture becomes more efficient, sustainable, and capable of meeting the needs of a growing population.
Therefore, transitioning from traditional to modern methods is a sign of progress and development in agriculture.
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