JAMB UTME - Physical Education - 2023

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A sport where participants should have no means of contact is called non-contact games. In these games, players are not allowed to physically touch or tackle each other during gameplay. The objective is to avoid any physical contact with opponents, ensuring the safety and well-being of all players involved. The focus is on skill, strategy, and coordination rather than physical contact. Examples of non-contact games include tennis, badminton, swimming, and archery. These sports encourage fair competition and sportsmanship without risking injuries that can occur in contact sports.

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After digestion, proteins are converted into amino acids.
During the process of digestion, proteins are broken down into smaller molecules called peptides through the action of enzymes in the stomach and small intestine. These peptides are then further broken down by other enzymes into individual amino acids.
Amino acids are the building blocks of proteins and are crucial for various biological processes in the body. They are essential for the growth and repair of tissues, the synthesis of enzymes and hormones, and the functioning of the immune system.
Once proteins have been converted into amino acids, they can be absorbed into the bloodstream and transported to various cells in the body, where they are used to build new proteins or used as a source of energy.
Therefore, the correct answer is amino acid.

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The organ that is not part of the alimentary canal is the skin.
The alimentary canal is a long tube-like structure in our body that is responsible for the process of digestion. It begins at the mouth and ends at the anus. The purpose of the alimentary canal is to break down the food we eat into smaller, absorbable molecules that our body can use for energy, growth, and repair.
The organs that make up the alimentary canal include the mouth, esophagus, stomach, small intestine (which consists of the duodenum, jejunum, and ileum), and large intestine (which consists of the colon and rectum). These organs work together to digest and absorb nutrients from the food we consume.
However, the skin is not part of the alimentary canal. The skin is the outer covering of our body and serves as a protective barrier against the external environment. It plays a crucial role in regulating body temperature, preventing water loss, and protecting our internal organs from injury and infections. While the skin is important for our overall health and well-being, it is not involved in the digestion process like the organs of the alimentary canal are.
In summary, the skin is not part of the alimentary canal because it is not involved in the process of digestion. The alimentary canal consists of organs such as the mouth, esophagus, stomach, small intestine, and large intestine, which work together to break down and absorb nutrients from the food we eat.

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The type of exchange in a relay race, in which the receiver's hand is behind them at the waist height with the palm facing down, is called the Upsweep.
During the upsweep exchange, the runner who is about to receive the baton holds their hand behind them, at waist height, with the palm facing downward. This position allows for a smooth and efficient transfer of the baton from the outgoing runner to the incoming runner.
The upsweep exchange is advantageous because it allows for a quick and secure handoff between the two runners. The palm facing downward helps ensure that the baton is securely placed in the receiving runner's hand, minimizing the risk of dropping or losing control of the baton.
This type of exchange is commonly used in relay races because of its reliability and efficiency. It allows for a seamless transition between runners and minimizes the potential for errors during the baton exchange, ultimately contributing to the overall success of the relay team.

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marketing, the sum of activities involved in directing the flow of goods and services from producers to consumers

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In Judo, one of the most important things to understand is that it is primarily a **grappling martial art**. While there are various skills involved, we need to identify the skill that does not belong to Judo. Out of the given options, **kicking** is the skill that is not a part of Judo. In fact, Judo specifically focuses on throwing and groundwork techniques rather than striking or kicking. Let's briefly discuss the other skills mentioned in the options: - **Gripping**: This skill is crucial in Judo as it involves controlling and manipulating your opponent's body by gripping their uniform (gi). - **Stance**: A correct and balanced stance is essential in Judo. It provides stability, power, and control during throwing techniques. - **Falling**: Falling or **ukemi** is an integral part of Judo. Proper falling techniques are taught to Judo practitioners to ensure their safety during training and competition. Therefore, it is clear that **kicking** is not a skill in Judo, whereas gripping, stance, and falling are all fundamental aspects of this martial art.

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Only 3 trials are allowed in shot put.

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The capacity to change direction effectively and quickly while maintaining body posture is called agility. Agility is the ability to move and change direction with ease, speed, and precision. It involves coordination, balance, and quick reflexes.
Agility is not just about being fast, but also being able to control your body movements and maintain balance while moving in different directions. It requires flexibility, strength, and an awareness of your body positioning.
Having good agility is important in many sports and physical activities, such as basketball, soccer, tennis, and martial arts. It allows athletes to quickly change direction, dodge opponents, and react to unexpected situations.
By training and improving agility, individuals can enhance their overall performance in sports, reduce the risk of injury, and improve body control. Agility drills, exercises, and practice can help improve reaction time, coordination, and body awareness.
In summary, agility is the ability to change direction quickly, maintain body posture, and move with precision. It is an essential skill for athletes and can be developed through training and practice.

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100m is an example of a sprint race. Sprint races are short distance races in athletics and running. They involve running as fast as possible over a short distance. The other options like marathon and 1,500m are long distance races, and 400m is considered a middle distance race.

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The type of hazardous pollution caused by automobiles is carbon monoxide.
When we drive cars, they burn gasoline or diesel fuel to produce energy that moves the car. However, this burning process also produces harmful gases as byproducts. One of these gases is carbon monoxide (CO).
Carbon monoxide is a colorless, odorless gas that is very harmful to humans and the environment. It is produced when there is not enough oxygen during the burning process, which is common in the engines of cars.
When we inhale carbon monoxide, it binds to our red blood cells more easily than oxygen, reducing the amount of oxygen our body can carry. This can lead to serious health problems, especially for people with heart or lung conditions.
Additionally, carbon monoxide is a greenhouse gas that contributes to climate change. It traps heat in the atmosphere, leading to higher global temperatures and disrupting the natural balance of our planet.
In summary, the hazardous pollution caused by automobiles is carbon monoxide. It is harmful to both human health and the environment, making it important for us to find ways to reduce its emissions from vehicles.

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The first All Africa Games were held in 1965. These games were established by the African Union (AU) as a way to promote unity and solidarity among African nations.
The All Africa Games is a multi-sport event that brings together athletes from all over the African continent. It is held every four years, similar to the Olympic Games.
The purpose of these games is to encourage friendly competition and cooperation among African nations, while also providing a platform for athletes to showcase their talents on an international stage.
The first edition of the All Africa Games took place in Brazzaville, Congo, with athletes from 30 African countries participating in various sports disciplines. These sports included athletics, swimming, boxing, football, basketball, and more.
Since then, the All Africa Games have grown in size and popularity, with more African countries participating in each edition and new sports being added to the program. It has become an important event for African athletes to represent their countries and strive for sporting excellence.

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Recreational activities are meant to be done during leisure time. Leisure time refers to the period when we are not busy with work, school, or other obligations. This is when we have free time to engage in activities that we enjoy and find entertaining. Recreational activities are meant to provide relaxation, enjoyment, and a break from our daily routines and responsibilities. Whether it's playing sports, reading a book, watching a movie, or spending time with friends and family, these activities help to rejuvenate our minds and bodies. Therefore, it is ideal to participate in recreational activities during leisure time when we can fully immerse ourselves in the experience without any distractions or time constraints.

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The sideways curvature of the spine is called scoliosis.
Scoliosis is when the spine curves to the side instead of being straight. It can occur in different parts of the spine and vary in severity.
Causes of scoliosis include genetic factors, muscle imbalances, and certain medical conditions. Sometimes, the cause is unknown.
It is important to detect scoliosis early because it can worsen over time and lead to pain, breathing difficulties, and reduced mobility.
Treatment for scoliosis depends on the severity and individual needs. It may include exercises, braces, or in severe cases, surgery. Regular check-ups and monitoring are essential to manage scoliosis effectively.

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Herbert Macaulay is considered the founder of Nigerian Nationalism because of his significant contributions to the nationalist movement in Nigeria. He played a key role in advocating for Nigeria's independence from British colonial rule and in mobilizing Nigerians to fight for their rights and freedom.
Macaulay was a multi-talented individual who excelled in various fields. He was a nationalist, politician, engineer, architect, journalist, and even a musician. Through his diverse skills and talents, he was able to engage with people from different backgrounds and effectively communicate his ideas and goals.
As a politician, Macaulay used his platform to advocate for constitutional reforms and the inclusion of Nigerians in the governance of their own country. He founded the Nigerian National Democratic Party (NNDP) in 1923, which became a prominent political party advocating for Nigerian interests.
Macaulay's journalistic skills were instrumental in spreading awareness and mobilizing Nigerians for the nationalist cause. He founded and edited the newspaper Lagos Daily News, which became a powerful tool for disseminating information and shaping public opinion.
Furthermore, Macaulay's engineering and architectural expertise enabled him to contribute to the development and modernization of Lagos. He played a key role in urban planning and infrastructure projects, which helped improve the quality of life for Nigerians.
Macaulay's unwavering commitment to Nigerian nationalism and his tireless efforts in fighting for independence laid the foundation for future nationalist leaders, such as Tafawa Balewa, Aguyi Ironsi, and Ahmadu Bello. While these individuals also made significant contributions to Nigerian nationalism, it was Macaulay who paved the way and inspired others to join the cause.
In conclusion, Herbert Macaulay is widely regarded as the founder of Nigerian nationalism due to his integral role in advocating for Nigeria's independence, his contributions to various fields, and his ability to mobilize and unite Nigerians in the nationalist movement.

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Paddles are not used in badminton games. Badminton is a racquet sport played using racquets to hit a shuttlecock across a net. The equipment used in badminton includes a racquet, shuttlecock, and strings for the racquet.

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A component of a school health program is **health services**. Health services are an essential part of a school health program as they involve medical professionals and resources that cater to the healthcare needs of students. These services can include regular health check-ups, immunizations, first aid, and treatment for minor illnesses and injuries. Health services also provide support for students with chronic conditions such as asthma or diabetes. The presence of health services in schools ensures that students have access to immediate medical care and support, promoting their overall well-being and enabling them to focus on their studies. These services can be provided by school nurses or in collaboration with local healthcare providers. It is important to note that while external services and curable services may contribute to the well-being of students, they are not specific components of a school health program. External services may refer to community organizations or agencies that provide support to schools but are not directly part of the program. Curable services may not be a relevant term in the context of a school health program, as it is unclear what specific services it entails. In summary, health services are an integral component of a school health program, ensuring the physical well-being of students by providing access to medical care, support, and resources.

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The agency that fights human trafficking in Nigeria is NAPTIP, which stands for National Agency for the Prohibition of Trafficking in Persons. NAPTIP was established in 2003 as a response to the increasing cases of trafficking in persons both within and outside Nigeria.
NAPTIP is primarily responsible for investigating, prosecuting, and preventing human trafficking activities in Nigeria. The agency works towards the elimination of all forms of human trafficking, including child labor, sexual exploitation, and forced labor.
NAPTIP's mandate covers a wide range of activities aimed at combating human trafficking, including rescue and rehabilitation of victims, public awareness campaigns, policy advocacy, and collaboration with national and international partners.
The agency focuses on four key pillars in the fight against human trafficking: 1. Prevention: NAPTIP conducts sensitization campaigns and educational programs to raise awareness about the dangers and consequences of human trafficking. They work with communities, schools, and vulnerable groups to prevent individuals from being trafficked. 2. Prosecution: NAPTIP works closely with law enforcement agencies to investigate and prosecute perpetrators of human trafficking. They gather evidence, identify and apprehend traffickers, and ensure they face legal consequences for their actions. 3. Protection: NAPTIP provides shelter, medical care, counseling, and other support services to victims of human trafficking. They work towards the physical, psychological, and social rehabilitation and empowerment of survivors, ensuring they are reintegrated into society. 4. Partnerships: NAPTIP collaborates with national and international organizations, government agencies, civil society groups, and law enforcement agencies to strengthen the fight against human trafficking. This includes sharing information, resources, and expertise to improve coordination and effectiveness.
Through its efforts, NAPTIP is making significant progress in combating human trafficking in Nigeria. However, the fight against human trafficking is an ongoing battle, and NAPTIP continues to work tirelessly to ensure the protection and well-being of individuals vulnerable to exploitation and trafficking.

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Ankle is known as tarsus in humans. It contains seven bones called tarsal's. It is arranged in three rows having gliding joints

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A field event is a type of athletic competition that takes place in a designated area or field rather than on a track. It involves athletes competing in various events that require physical strength, skill, and technique.
Out of the options provided, javelin throw is the field event. In javelin throw, an athlete throws a long spear-like object called a javelin as far as possible within a marked area. The aim is to achieve the maximum distance with proper technique, accuracy, and strength.
On the other hand, hurdles race, 100m race, and relay race are all track events. In hurdles race, athletes run and jump over a series of hurdles placed at regular intervals on the track. The objective is to complete the race in the shortest possible time while clearing all the hurdles.
In a 100m race, athletes compete to run a distance of 100 meters in the fastest time possible, with the finish line being the determining factor.
A relay race involves a team of runners passing a baton from one runner to another, usually in a circular or linear track. The goal is to complete the race in the shortest time by efficiently transferring the baton between team members.
Therefore, among the options mentioned, only javelin throw can be categorized as a field event as it takes place in a designated area and requires throwing a javelin for distance.

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To win a game in badminton, a player or a team needs to score a certain number of points. The number of points required to win a badminton game is 21 points.
However, there are certain rules that need to be followed in order to determine the winner. The winner must also have a 2-point lead over their opponent to secure the victory.
Let me explain the scoring system more in detail. In badminton, each rally results in a point being awarded to one of the players or teams. The rally starts with a serve and ends when the shuttlecock hits the ground within the boundaries, or if a fault is committed by one of the players.
Regardless of who served, a point is awarded to the serving side every time they win a rally. If the serving side loses a rally, the serve will be handed over to the opposing side, and they will have an opportunity to score points.
The game is played until one player or team reaches 21 points, with a 2-point lead. If the score reaches a tie at 20-20, it is called a "deuce". In a deuce, players need to continue playing until a player or team gains a 2-point lead to win the game.
In summary, to win a badminton game, a player or team needs to score 21 points with a 2-point lead over the opponent.

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The assistant referees in a soccer game are also called linesmen.
These linesmen play a crucial role in assisting the main referee in making important decisions during the game. They are positioned along the sidelines of the field and their main responsibilities include:
1. Offside Decision: One key responsibility of the linesmen is to help the referee determine if a player is in an offside position. Offside is a rule in soccer that prevents players from being in a forward position and actively involved in play when the ball is played to them, unless there are enough defenders between them and the goal line. The linesmen use their position and judgement to raise their flag and notify the referee if they believe an offside has occurred.
2. Out of Play Decision: The linesmen also assist the referee in determining if the ball has gone out of play. This includes situations such as when the ball has fully crossed the sideline or the goal line. If the linesman sees the ball go out of play, they raise their flag to signal that the ball is no longer in play.
3. Fouls and Decisions: The linesmen also help the referee identify fouls and infringements that may have occurred during the match. They can communicate with the referee through subtle gestures or flag signals if they notice an infringement that the referee may have missed. This helps the referee make fair and accurate decisions.
4. Substitutions: The linesmen also assist in managing substitutions during the game. They keep track of the number of substitutions made by each team and inform the referee when a substitution is requested.
In summary, the linesmen are an essential part of the officiating team in a soccer match. They assist the referee in making important decisions regarding offside, out of play situations, fouls, and substitutions.

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The vestigial bony part of the human skeleton is the Coccyx.
The coccyx, also known as the tailbone, is a small triangular structure located at the bottom of the vertebral column. It consists of three to five fused vertebrae.
In the past, the coccyx had a more functional role in our ancestors who had tails. However, over millions of years of evolution, the tail became unnecessary for human survival and gradually disappeared.
Today, the coccyx serves as a vestigial structure, meaning it is a remnant of our evolutionary past that no longer has a significant function. It is a reduced and modified version of what used to be a functional tail.
Function: While the coccyx no longer has a significant role in humans, it does serve as an attachment point for several muscles, tendons, and ligaments. These structures help support our body weight when we sit or stand and also play a role in stabilizing our pelvis.
Development: During embryonic development, the coccyx starts as separate vertebrae. However, as the fetus develops, these vertebrae gradually fuse together to form the coccyx. This fusion is typically complete by early adulthood.
Importance: Although the coccyx is a vestige of our evolutionary past with no significant function in modern humans, it can still be susceptible to injury or discomfort. Falls, trauma during childbirth, or prolonged sitting on hard surfaces can lead to coccyx pain or fracture.
To summarize, the coccyx is the vestigial bony part of the human skeleton. It is a remnant of our evolutionary history when our ancestors had tails. Although it no longer has a significant function, it serves as an attachment point for muscles and plays a role in supporting our pelvis.

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The institutional games in Nigeria are organized competitive events between universities or institutions. Three out of the four options given are actually institutional games in Nigeria, namely NATCEGA, NUGA, and NIPOGA.
NATCEGA stands for National Theatre Command Entertainment Games. It is an annual event that brings together theater command troops from various branches of the Nigerian military for friendly competitions in various sporting activities. This helps to foster camaraderie and promote physical fitness among the military personnel.
NUGA stands for Nigerian Universities Games Association. It is an annual multi-sport event that brings together universities from all over Nigeria to compete against each other in various sporting disciplines. The aim of NUGA is to promote sports development and healthy competition among university students.
NIPOGA stands for Nigerian Polytechnic Games. It is a biennial sporting event that brings together polytechnics and similar institutions in Nigeria for friendly competitions in different sports. NIPOGA provides an avenue for students and staff of polytechnics to showcase their sporting talents and promote healthy competition.
That leaves us with the NBA as the option that is not an institutional game in Nigeria. The NBA, or Nigerian Bar Association, is a professional association of lawyers and legal practitioners in Nigeria. While the NBA organizes conferences, workshops, and other professional events, it is not specifically focused on organizing sporting competitions among institutions or universities. Thus, the NBA is not an institutional game in Nigeria.

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Swimming is an example of a non-contact game. In swimming, athletes participate in a race by propelling themselves through the water using different swimming strokes. Unlike boxing, wrestling, and taekwondo, swimming does not involve physical contact between the athletes. Instead, swimmers focus on their speed, technique, and endurance to outperform their competitors and reach the finish line faster. It is essential to note that while swimming is a non-contact game, athletes still adhere to certain rules and regulations to ensure fair competition and safety in the pool.

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Posture is affected by factors such as age, habit, and heredity. Complexion, which refers to the natural color, texture, and appearance of the skin, does not affect posture.

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The correct answer is a **polygamous family**. In a polygamous family, one spouse (whether it be a man or a woman) has multiple spouses. This means that the individual has entered into multiple legal marriages simultaneously. Polygamy can take different forms. One common form is **polygyny**, where a man has multiple wives. In this case, the man is the only one who is allowed to have multiple spouses. Another form is **polyandry**, where a woman has multiple husbands. However, polyandry is less common compared to polygyny. In a polygamous family, the spouses may live together or in separate households. It is important to note that the type of family structure can vary across different cultures and religions around the world. While polygamy is practiced in some societies, it is illegal in many countries.

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Carbon monoxide is a source of air pollution. When we burn fossil fuels such as gasoline, diesel, and natural gas in vehicles, power plants, and industries, carbon monoxide is released into the air. It is a colorless and odorless gas that is harmful to the environment and human health.
In our atmosphere, carbon monoxide reacts with other pollutants to form smog, which is a type of air pollution. Smog can cause respiratory problems, especially for people with asthma or other respiratory conditions.
Carbon monoxide also contributes to the greenhouse effect, which is responsible for global warming and climate change. This gas traps heat in the atmosphere, leading to the gradual increase in Earth's temperature.
So, carbon monoxide is a significant contributor to air pollution and its negative effects on both the environment and human health. It is crucial to reduce carbon monoxide emissions by using cleaner forms of energy and implementing stricter regulations for industries and vehicles.

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Kicking is not a skill and technique in boxing. Boxing is a combat sport that involves using punches and defensive techniques inside a ring. The objective is to score points by landing clean and powerful punches on the opponent while avoiding getting hit. The sport is strictly limited to the use of the hands only, which means that kicking is not allowed in boxing. Here is a breakdown of the other options: - **Dodging**: Dodging is a crucial skill in boxing. It involves moving the body and head to avoid incoming punches from the opponent. By dodging, a boxer can evade punches and minimize the chances of getting hit. - **Ducking**: Ducking is another defensive technique used in boxing. It involves bending the knees and lowering the body to avoid an opponent's punch, primarily aimed at the head. By ducking, a boxer can create space and avoid getting struck by an incoming punch. - **Jabbing**: Jabbing is a basic and essential technique in boxing. It is a quick, straight punch thrown with the front hand, usually the non-dominant hand. Jabs are used to set up combinations, keep the opponent at bay, and score points in boxing matches. In summary, while dodging, ducking, and jabbing are fundamental skills and techniques in boxing, kicking is not permitted in this sport. Boxing relies solely on punches and defensive maneuvers using the hands.

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Fruits and vegetables are important for several reasons:

1. They give you energy: Fruits and vegetables are packed with carbohydrates, which are the body's main source of energy. They provide us with the fuel we need to go about our daily activities.

2. They are easily available: Fruits and vegetables are widely accessible in grocery stores, farmers' markets, and even in our own backyards. They are readily available, making it convenient for us to incorporate them into our diets.

3. They are colorful: Fruits and vegetables come in a wide array of vibrant colors such as red, orange, green, and purple. These colors are not just visually appealing, but they also indicate the presence of different nutrients and antioxidants that are essential for our health.

4. They provide you with a wide variety of vitamins, minerals, and nutrients: Fruits and vegetables are rich in vitamins, minerals, and nutrients that our bodies need to function properly. They are excellent sources of vitamin C, vitamin A, potassium, fiber, and folate, among others.

In conclusion, fruits and vegetables give us energy, are easily available, add color to our meals, and provide us with a wide range of essential vitamins, minerals, and nutrients. It is important to include them in our daily diet for overall health and wellbeing.

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Headache is not a water-borne disease.
Water-borne diseases are illnesses caused by microorganisms that are transmitted through contaminated water. These pathogens can enter the body when we consume or come into contact with contaminated water.
Hepatitis is a water-borne disease that affects the liver. It is caused by various viral infections, such as hepatitis A, B, and C.
Cholera is another water-borne disease caused by the bacterium Vibrio cholerae. It leads to severe diarrhea and dehydration if left untreated.
Typhoid is also a water-borne disease caused by the bacterium Salmonella typhi. It causes high fever, abdominal pain, and weakness.
However, headache is not caused by contaminated water. It can be induced by various factors like stress, tension, dehydration, eye strain, or medical conditions. While dehydration can contribute to a headache, it is not the sole cause. Headaches can occur regardless of the water quality and do not require the presence of waterborne pathogens to develop.
Therefore, out of the given options, headache does not belong to the category of water-borne diseases.

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Harding James Ekperigin is widely recognized as the father of physical education in Nigeria. He made significant contributions to the development and promotion of physical education in the country.

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The swimming stroke that is not listed among the options is the downstroke.

Let's briefly discuss the other three swimming strokes to understand why the downstroke is not considered a swimming stroke:

Crawl: Also known as freestyle, the crawl is the fastest and most commonly used stroke in competitive swimming. It involves a continuous alternating arm motion and a flutter kick. Swimmers move their arms in a windmill-like pattern, pulling the water towards them, while their legs kick in a repetitive up and down motion.

Backstroke: As the name suggests, swimmers swim on their backs, facing up. The main propulsive force in backstroke comes from the alternating arm movement, similar to the crawl stroke. The arms move in a wider arc, and the hands enter the water pinky-first. The legs perform a flutter kick, similar to that of the crawl stroke.

Breaststroke: The breaststroke is the slowest of the four competitive swimming strokes, but it is often considered the most graceful. Swimmers synchronize a frog-like kick and an arm pull to propel themselves through the water. The arms move together in a half-circle motion underwater, while the legs kick outwards and then back inwards simultaneously.

Downstroke: The term "downstroke" does not correspond to any recognized swimming stroke. It may be a term used in other contexts or in certain swimming drills, but it is not a distinct swimming stroke like the crawl, backstroke, or breaststroke.

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The ability of the body systems to work together efficiently to allow you to be healthy and perform activities of daily living is physical fitness. Physical fitness refers to the overall condition of your body and how well it can perform physical activities. It involves different aspects such as strength, endurance, flexibility, and cardiovascular health.
When your body systems, such as the respiratory, circulatory, muscular, and skeletal systems, are in good condition and work together harmoniously, you have a higher level of physical fitness. This means your body can efficiently carry out tasks and movements, allowing you to have the energy and stamina to engage in activities without getting tired quickly.
Physical fitness also plays a vital role in maintaining good posture. Having strong muscles and a flexible body can help support your spine and maintain proper alignment, reducing the risk of developing posture-related issues.
Additionally, physical fitness has a positive impact on the immune system. Regular exercise and staying physically active can boost your immune system and help protect against various illnesses and diseases. When you are physically fit, your body is better equipped to fight off infections and recover more quickly.
In summary, physical fitness is essential for the body systems to work together efficiently. It allows you to stay healthy, have the energy and stamina for daily activities, maintain good posture, and enhance the functionality of your immune system.

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In a gymnastic game, the officials play different roles to ensure fair and organized competition. Among the options provided, **lines men** is not an official in a gymnastic game. Here's an explanation of the roles of the other officials: - **Referee**: The referee is responsible for ensuring that the gymnastic game is conducted according to the rules and regulations. They oversee the overall conduct of the competition, including starting and ending the routines or exercises, making final decisions on rule violations, and handling any disputes or protests. - **Judges**: Judges play a crucial role in gymnastics competitions. Their primary task is to evaluate and score the performances of the gymnasts based on predefined criteria. They assess factors such as technique, difficulty, execution, artistry, and overall performance. The judges assign scores to each routine or exercise, which are used to determine the winners. - **Time keepers**: Time keepers, also known as time officials, are responsible for accurately measuring and recording the duration of each gymnast's routine or exercise. They ensure that the athletes adhere to the time limits specified for their respective routines. The timekeepers use timing devices, such as stopwatches or electronic timers, to track the durations. While all the other options mentioned—referee, judges, and time keepers—are important officials in gymnastics, **lines men** are not typically involved in gymnastic competitions. The term "lines men" is more commonly associated with sports such as soccer or rugby, where their role is to assist the referee by indicating when the ball has crossed the boundary lines of the field. In gymnastics, the focus is mainly on the gymnasts' performances and the evaluation by the judges.

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The external openings of the nasal cavity that admit air to the lungs are called nostrils.
The nostrils, also known as the nares, are the two openings at the base of the nose. They are responsible for allowing air to enter our respiratory system. When we breathe in, air flows through the nostrils and passes into the nasal cavity, which is a hollow space inside the nose.
The nostrils play an essential role in the respiratory process. As we inhale, the air enters the nasal cavity and is filtered, moistened, and warmed before it reaches the lungs. The nostrils are lined with small hairs called cilia, which help to filter out dust, pollen, and other particles from the air we breathe. The nose also contains mucus-secreting cells that moisten the air, preventing it from drying out the delicate lung tissues. Additionally, the nasal cavity has a rich blood supply, which helps to warm the air before it reaches the lungs, ensuring that it is at the right temperature for optimal breathing.
In summary, the nostrils are the external openings of the nasal cavity that allow air to enter the respiratory system. They filter, moisten, and warm the air, preparing it for the lungs to ensure efficient respiration.

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Tooth decay in children is primarily caused by the excess presence of fluoride. Fluoride is a naturally occurring mineral that can be found in various sources such as water, food, and dental products. It is commonly added to toothpaste and water supplies to help prevent tooth decay.
However, when there is an excessive amount of fluoride, it can have negative effects on dental health. This is particularly true for children whose teeth are still developing.
Excess fluoride can cause a condition called dental fluorosis, which affects the outer layer of the teeth called the enamel. Dental fluorosis leads to the formation of white or brownish stains, and in severe cases, it can cause pitting or mottling of the teeth.
It's important to note that fluoride in optimal amounts is beneficial for dental health, as it helps to strengthen enamel and prevent tooth decay. The key is to ensure that children are exposed to fluoride in appropriate concentrations.
In summary, the excess presence of fluoride can cause tooth decay in children by leading to dental fluorosis, resulting in discoloration and damage to the tooth enamel.

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Hyaline cartilage is the type of cartilage present at the joints of long bones in humans. It provides a smooth surface for joint movement, absorbs shock, and reduces friction. Fibrous and elastic cartilages are found in other parts of the body, while calcified cartilage is a stage in endochondral ossification, not a type of cartilage found in joints

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If the assistant referee in a soccer match raises the flag at a 45 degree angle and points it horizontally along the touch line, it indicates a throw-in.
A throw-in happens when the ball goes out of bounds over the side of the field, also known as the touchline. When this happens, the team that did not touch the ball last is awarded a throw-in. The assistant referee uses the flag to signal to the referee and the players that a throw-in should be taken.
The 45 degree angle and horizontal pointing of the flag are important signals that help the referee and players understand the decision. It is a clear and standard way to indicate a throw-in.

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Anatomy is the study of the structure and relationship between body parts. It focuses on understanding how different parts of the body are organized and connected to each other. This includes studying the shapes, sizes, and locations of organs, tissues, and cells. By examining these details, anatomists can gain a better understanding of how the body functions as a whole. In simple terms, anatomy helps us to understand the physical structure of the body and how its various parts work together.

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A track event is a type of competition that involves running, jumping, or throwing on an oval-shaped track. Out of the given options, the track event is the 100m race.
The triple jump and high jump are both field events, rather than track events. The triple jump is a jumping event that involves three consecutive phases: the hop, the step, and the jump. Athletes aim to jump as far as possible in one single attempt.
Similarly, the high jump is also a jumping event. Athletes try to leap over a horizontal bar set at a specific height without knocking it down. The higher the bar, the greater the difficulty.
The pole vault, on the other hand, involves using a long, flexible pole to propel oneself over a horizontal bar. Athletes sprint down a runway, plant the pole in a specially designed box, and use it to propel themselves over the bar.
In summary, the 100m race is the track event among the given options. It is a sprinting event where athletes compete to be the fastest over a distance of 100 meters.