When kerosene oil is added to stagnant water, mosquitoes reduce because it interferes with the breathing of the larvae; option [C]. Kerosene forms a thin film on the water's surface, which blocks the larvae's access to air. Since mosquito larvae need to breathe air through a siphon at the water surfRead more
When kerosene oil is added to stagnant water, mosquitoes reduce because it interferes with the breathing of the larvae; option [C]. Kerosene forms a thin film on the water’s surface, which blocks the larvae’s access to air. Since mosquito larvae need to breathe air through a siphon at the water surface, the layer of kerosene prevents them from doing so effectively, leading to suffocation and mortality. This disruption of their respiratory process significantly impairs their ability to survive and develop into adult mosquitoes.
While kerosene does not directly poison the mosquitoes or drive them away, its presence alters the environment in a way that is inhospitable to mosquito larvae. By obstructing their access to essential air, kerosene effectively hinders their development and reproduction cycle. This method is often used as a non-toxic approach to mosquito control, as it targets the larvae rather than adult mosquitoes. Consequently, by reducing the mosquito population at the larval stage, it helps mitigate the risk of mosquito-borne diseases and discomfort caused by adult mosquitoes.
The shape of a raindrop becomes spherical primarily due to surface tension; option [B]. Surface tension is the cohesive force between water molecules at the surface, causing them to pull inward. When a raindrop forms, surface tension acts equally in all directions, minimizing the surface area and puRead more
The shape of a raindrop becomes spherical primarily due to surface tension; option [B]. Surface tension is the cohesive force between water molecules at the surface, causing them to pull inward. When a raindrop forms, surface tension acts equally in all directions, minimizing the surface area and pulling the drop into a spherical shape. This occurs despite the influence of gravity, which tends to deform the drop slightly. While viscosity, elasticity, and gravity play roles in the behavior of raindrops, surface tension is the dominant force determining their shape. Raindrops maintain their spherical form until they encounter air resistance or other forces that may cause deformation. Understanding the interplay between surface tension and external forces helps explain the characteristic shape of raindrops and their behavior during precipitation events.
The principle of purification by soap is based on surface tension; option [A]. Soap molecules contain both hydrophilic and hydrophobic parts. When soap is added to water, its hydrophobic tails attach to oil and grease, while the hydrophilic heads face outward. This forms structures called micelles,Read more
The principle of purification by soap is based on surface tension; option [A]. Soap molecules contain both hydrophilic and hydrophobic parts. When soap is added to water, its hydrophobic tails attach to oil and grease, while the hydrophilic heads face outward. This forms structures called micelles, which encapsulate the dirt and oil, breaking them into smaller droplets suspended in the water. These micelles reduce the surface tension of water, allowing the trapped particles to be easily lifted away. This mechanism is essential for cleaning surfaces as it prevents the redeposition of dirt and oil onto cleaned surfaces. Therefore, the effectiveness of soap in purification is fundamentally tied to its ability to alter surface tension, facilitating the removal of contaminants and ensuring thorough cleaning across various surfaces.
Oil spreads on the surface of water primarily due to differences in surface tension between the two substances. The surface tension of water is higher than that of oil. This means that water molecules tend to stick together more strongly at the surface, forming a "skin" that resists penetration. InRead more
Oil spreads on the surface of water primarily due to differences in surface tension between the two substances. The surface tension of water is higher than that of oil. This means that water molecules tend to stick together more strongly at the surface, forming a “skin” that resists penetration. In contrast, oil molecules have weaker intermolecular forces at the surface, allowing them to spread out more easily. This phenomenon occurs despite the fact that oil is less dense than water; option [D]. Oil molecules move to the water’s surface to minimize contact with water molecules, creating a thin layer. This behavior is essential in environmental contexts, such as oil spills, where oil can spread rapidly over large areas of water. Understanding the surface tension properties of oil and water is crucial for managing and mitigating the environmental impacts of such incidents.
H5N1 bird flu is a subtype of influenza A virus that primarily infects birds but can also be transmitted to humans. It poses a significant threat to both animal and human health. In birds, H5N1 can cause severe illness and high mortality rates, leading to significant economic losses in the poultry iRead more
H5N1 bird flu is a subtype of influenza A virus that primarily infects birds but can also be transmitted to humans. It poses a significant threat to both animal and human health. In birds, H5N1 can cause severe illness and high mortality rates, leading to significant economic losses in the poultry industry. When humans are infected, typically through direct contact with infected birds or contaminated environments, H5N1 can result in severe respiratory illness and, in some cases, death. While human-to-human transmission of H5N1 is rare, it has the potential to lead to a widespread outbreak or pandemic if the virus undergoes genetic changes that allow for efficient transmission between people. Monitoring and control measures, including surveillance, vaccination, and biosecurity protocols, are essential for preventing and managing outbreaks of H5N1 bird flu.
When kerosene oil is added to stagnant water, mosquitoes reduce because it
When kerosene oil is added to stagnant water, mosquitoes reduce because it interferes with the breathing of the larvae; option [C]. Kerosene forms a thin film on the water's surface, which blocks the larvae's access to air. Since mosquito larvae need to breathe air through a siphon at the water surfRead more
When kerosene oil is added to stagnant water, mosquitoes reduce because it interferes with the breathing of the larvae; option [C]. Kerosene forms a thin film on the water’s surface, which blocks the larvae’s access to air. Since mosquito larvae need to breathe air through a siphon at the water surface, the layer of kerosene prevents them from doing so effectively, leading to suffocation and mortality. This disruption of their respiratory process significantly impairs their ability to survive and develop into adult mosquitoes.
While kerosene does not directly poison the mosquitoes or drive them away, its presence alters the environment in a way that is inhospitable to mosquito larvae. By obstructing their access to essential air, kerosene effectively hinders their development and reproduction cycle. This method is often used as a non-toxic approach to mosquito control, as it targets the larvae rather than adult mosquitoes. Consequently, by reducing the mosquito population at the larval stage, it helps mitigate the risk of mosquito-borne diseases and discomfort caused by adult mosquitoes.
See lessDue to what reason does the shape of a rain drop become spherical?
The shape of a raindrop becomes spherical primarily due to surface tension; option [B]. Surface tension is the cohesive force between water molecules at the surface, causing them to pull inward. When a raindrop forms, surface tension acts equally in all directions, minimizing the surface area and puRead more
The shape of a raindrop becomes spherical primarily due to surface tension; option [B]. Surface tension is the cohesive force between water molecules at the surface, causing them to pull inward. When a raindrop forms, surface tension acts equally in all directions, minimizing the surface area and pulling the drop into a spherical shape. This occurs despite the influence of gravity, which tends to deform the drop slightly. While viscosity, elasticity, and gravity play roles in the behavior of raindrops, surface tension is the dominant force determining their shape. Raindrops maintain their spherical form until they encounter air resistance or other forces that may cause deformation. Understanding the interplay between surface tension and external forces helps explain the characteristic shape of raindrops and their behavior during precipitation events.
See lessWhat is the principle of purification by soap?
The principle of purification by soap is based on surface tension; option [A]. Soap molecules contain both hydrophilic and hydrophobic parts. When soap is added to water, its hydrophobic tails attach to oil and grease, while the hydrophilic heads face outward. This forms structures called micelles,Read more
The principle of purification by soap is based on surface tension; option [A]. Soap molecules contain both hydrophilic and hydrophobic parts. When soap is added to water, its hydrophobic tails attach to oil and grease, while the hydrophilic heads face outward. This forms structures called micelles, which encapsulate the dirt and oil, breaking them into smaller droplets suspended in the water. These micelles reduce the surface tension of water, allowing the trapped particles to be easily lifted away. This mechanism is essential for cleaning surfaces as it prevents the redeposition of dirt and oil onto cleaned surfaces. Therefore, the effectiveness of soap in purification is fundamentally tied to its ability to alter surface tension, facilitating the removal of contaminants and ensuring thorough cleaning across various surfaces.
See lessOil spreads on the surface of water because
Oil spreads on the surface of water primarily due to differences in surface tension between the two substances. The surface tension of water is higher than that of oil. This means that water molecules tend to stick together more strongly at the surface, forming a "skin" that resists penetration. InRead more
Oil spreads on the surface of water primarily due to differences in surface tension between the two substances. The surface tension of water is higher than that of oil. This means that water molecules tend to stick together more strongly at the surface, forming a “skin” that resists penetration. In contrast, oil molecules have weaker intermolecular forces at the surface, allowing them to spread out more easily. This phenomenon occurs despite the fact that oil is less dense than water; option [D]. Oil molecules move to the water’s surface to minimize contact with water molecules, creating a thin layer. This behavior is essential in environmental contexts, such as oil spills, where oil can spread rapidly over large areas of water. Understanding the surface tension properties of oil and water is crucial for managing and mitigating the environmental impacts of such incidents.
See lesswhat is H5N1 bird flu?
H5N1 bird flu is a subtype of influenza A virus that primarily infects birds but can also be transmitted to humans. It poses a significant threat to both animal and human health. In birds, H5N1 can cause severe illness and high mortality rates, leading to significant economic losses in the poultry iRead more
H5N1 bird flu is a subtype of influenza A virus that primarily infects birds but can also be transmitted to humans. It poses a significant threat to both animal and human health. In birds, H5N1 can cause severe illness and high mortality rates, leading to significant economic losses in the poultry industry. When humans are infected, typically through direct contact with infected birds or contaminated environments, H5N1 can result in severe respiratory illness and, in some cases, death. While human-to-human transmission of H5N1 is rare, it has the potential to lead to a widespread outbreak or pandemic if the virus undergoes genetic changes that allow for efficient transmission between people. Monitoring and control measures, including surveillance, vaccination, and biosecurity protocols, are essential for preventing and managing outbreaks of H5N1 bird flu.
See less