Grade 8 Science Exam Study Guide

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Science Quizzes & Trivia

Unit A-E
A- Mix and Flow of Matter
B- Cells and Systems
C- Light and Optics
D- Mechanical Systems
E- Fresh and Salt Water Systems


Questions and Answers
  • 1. 

    ______________ are highly senitive to light, while ____________ detect colour.

    • A.

      Cones are highly sensitive to light, while rods detect colour.

    • B.

      Rods are highly sensitive to light, while cones detect colour.

    Correct Answer
    B. Rods are highly sensitive to light, while cones detect colour.
    Explanation
    The explanation for the given answer is that rods are highly sensitive to light, allowing us to see in low light conditions, while cones are responsible for detecting color. Cones are less sensitive to light but are specialized in detecting different wavelengths of light, enabling us to perceive and distinguish various colors.

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  • 2. 

    Which one is NOT used for a reservoir?

    • A.

      Irrigation

    • B.

      Littering

    • C.

      Hydro-Electricity

    • D.

      Drinking

    Correct Answer
    B. Littering
    Explanation
    Littering is not used for a reservoir because it refers to the act of disposing waste or garbage in an inappropriate or careless manner. Reservoirs are used for purposes such as irrigation, hydro-electricity generation, and drinking water supply. Littering is not a purpose or use of a reservoir, but rather an action that can negatively impact the reservoir and its surrounding environment.

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  • 3. 

    Unit A If you tried to compress a solid, liquid and a gas, ____________ would be the easiest to compress.

    • A.

      Solid

    • B.

      Liquid

    • C.

      Gas

    Correct Answer
    C. Gas
    Explanation
    Gas would be the easiest to compress compared to a solid or a liquid. This is because the particles in a gas are more spread out and have more space between them compared to the particles in a solid or a liquid. Therefore, it is easier to apply pressure and reduce the volume of a gas, making it easier to compress.

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  • 4. 

    Hazard Symbol: Yellow Triangle

    • A.

      Danger

    • B.

      Caution

    • C.

      Warning

    Correct Answer
    B. Caution
    Explanation
    The hazard symbol with a yellow triangle is commonly associated with caution. It is used to indicate potential hazards or dangers that may not be as severe as those represented by red symbols. The yellow triangle serves as a warning to proceed with caution and be aware of potential risks or dangers in the given situation.

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  • 5. 

    Hazard Symbol: Orange Diamond

    • A.

      Warning

    • B.

      Danger

    • C.

      Caution

    Correct Answer
    A. Warning
    Explanation
    The correct answer is "Warning" because the hazard symbol being described is an orange diamond. In many standardized hazard communication systems, such as the Globally Harmonized System (GHS), an orange diamond is used to indicate a warning. This symbol is typically used to alert individuals to potential hazards that may not be as severe as those indicated by a red diamond (which signifies danger). The orange diamond may be used for cautionary purposes, indicating that there is a potential risk or danger present that individuals should be aware of.

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  • 6. 

    Hazard Symbol: Red Octagon

    • A.

      Warning

    • B.

      Caution

    • C.

      Danger

    Correct Answer
    C. Danger
    Explanation
    The red octagon hazard symbol is commonly associated with danger. It is used to warn people about potentially hazardous situations or substances that could cause harm or injury. The word "Danger" further emphasizes the seriousness of the situation and alerts individuals to take immediate precautions to avoid any potential risks.

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  • 7. 

    Define: Fluid

    • A.

      Anyhing that has no fixed shape and can flow

    • B.

      Anything that has a fixed shape and can flow

    • C.

      Anything that can flow

    Correct Answer
    A. Anyhing that has no fixed shape and can flow
    Explanation
    The correct answer is "Anything that has no fixed shape and can flow." This definition accurately describes a fluid as a substance that can change its shape and flow freely. Unlike solids, which have a fixed shape, fluids are capable of taking the shape of their container and can easily move or flow from one place to another.

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  • 8. 

    ____________ & ____________ are forms of matter that will take the shape of their container

    • A.

      Solid & Gas

    • B.

      Liquid & Solid

    • C.

      Liquid & Gas

    Correct Answer
    C. Liquid & Gas
    Explanation
    Liquid and gas are forms of matter that will take the shape of their container. Unlike solids, which have a fixed shape and volume, liquids and gases are able to flow and conform to the shape of the container they are placed in. Liquids have a definite volume but no definite shape, while gases have neither a definite shape nor a definite volume. This property allows liquids and gases to be easily poured or transferred from one container to another, making them highly adaptable to different environments.

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  • 9. 

    Define: Slurry

    • A.

      A mixture of gas and liquid

    • B.

      A mixture of liquid and solids

    • C.

      A mixture of solids and gas

    Correct Answer
    B. A mixture of liquid and solids
    Explanation
    Slurry is defined as a mixture of liquid and solids. This means that it contains both liquid and solid particles, with the liquid serving as the medium in which the solid particles are suspended or dispersed. Slurries can have various applications, such as in industrial processes, construction, and mining, where they are used for transportation, pumping, or coating purposes. The correct answer accurately describes the composition of a slurry, distinguishing it from mixtures of gas and liquid or solids and gas.

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  • 10. 

    Define: Pure Substance

    • A.

      Looks like one substance but more

    • B.

      More than one type of substance

    • C.

      Made up of one type of substance

    Correct Answer
    C. Made up of one type of substance
    Explanation
    A pure substance is defined as a substance that is made up of only one type of substance. This means that it consists of particles that are all identical in their chemical composition and properties. Unlike mixtures, which can contain multiple types of substances, a pure substance has a uniform composition throughout. It can exist in different physical states such as solid, liquid, or gas, but its fundamental chemical nature remains the same. Examples of pure substances include elements and compounds.

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  • 11. 

    Define: Mechanical Mixture

    • A.

      Made up of one type of substance

    • B.

      Made up of more than one type of substance

    • C.

      Looks like one type of substance but more

    Correct Answer
    B. Made up of more than one type of substance
    Explanation
    A mechanical mixture is defined as a mixture that is made up of more than one type of substance. Unlike a pure substance, which is made up of only one type of substance, a mechanical mixture consists of different substances that are physically mixed together. Although it may appear to be one type of substance, it actually contains multiple substances that can be separated through physical means, such as filtration or distillation.

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  • 12. 

    Define: Solution

    • A.

      Looks like one type of substance but more

    • B.

      More than one type of substance

    • C.

      Made up of one type of substance

    Correct Answer
    A. Looks like one type of substance but more
    Explanation
    The correct answer is "More than one type of substance". This means that a solution is composed of multiple substances that are mixed together, but they still appear as a single type of substance. In a solution, the different substances are evenly distributed and cannot be easily separated.

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  • 13. 

    Define: Colliod

    • A.

      Homogeneous Mixture

    • B.

      Cloudy Mixture

    • C.

      Heterogeneous Mixture

    Correct Answer
    B. Cloudy Mixture
    Explanation
    A cloudy mixture refers to a type of heterogeneous mixture where the substances are not evenly distributed and can be visibly seen as separate phases or particles in the mixture. This can occur when insoluble particles or droplets are suspended in a liquid or gas, causing the mixture to appear cloudy or opaque. The particles or droplets do not dissolve or mix uniformly with the surrounding medium, resulting in a non-uniform distribution and a cloudy appearance.

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  • 14. 

    Define: Solute

    • A.

      The substance doing the dissolving

    • B.

      The substance being dissolved

    Correct Answer
    B. The substance being dissolved
    Explanation
    The solute refers to the substance that is being dissolved in a solution. In a solution, the solute is the component that is present in a smaller quantity and is dissolved by the solvent. It is the substance that undergoes a physical or chemical change to form a homogeneous mixture with the solvent. The solute particles are dispersed throughout the solvent and can be solid, liquid, or gas. Examples of solutes include sugar, salt, and carbon dioxide.

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  • 15. 

    Define: Solvent

    • A.

      The substance doing the dissolving

    • B.

      The substance being dissolved

    Correct Answer
    A. The substance doing the dissolving
    Explanation
    The term "solvent" refers to the substance that is responsible for dissolving another substance. In a solution, the solvent is the component that is present in greater quantity and has the ability to dissolve the solute. It is the medium through which the solute particles are dispersed and separated. The solvent interacts with the solute particles, breaking their bonds and surrounding them, resulting in the formation of a homogeneous mixture.

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  • 16. 

    The four main parts of the particle model matter are....

    • A.

      All matter is made up of tiny particles They never move They have space between them They are attracted to each other

    • B.

      They are always moving They have space between them They can bounce off each other

    • C.

      All matter is made up of tiny particles They are always moving They have space between them They have space between them

    Correct Answer
    C. All matter is made up of tiny particles They are always moving They have space between them They have space between them
    Explanation
    The correct answer is: All matter is made up of tiny particles, They are always moving, They have space between them, They can bounce off each other.

    This answer accurately describes the four main parts of the particle model of matter. It states that matter is composed of tiny particles, which are always in motion and have space between them. Additionally, it acknowledges that these particles can interact and bounce off each other.

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  • 17. 

    Particles move the slowest in a ____________ and quickest in a ____________

    • A.

      Slowest in a liquid, Quickest in a Solid

    • B.

      Slowest in a Gas, Quickest in a liquid

    • C.

      Slowest in a Solid, Quickest in a Gas

    Correct Answer
    C. Slowest in a Solid, Quickest in a Gas
    Explanation
    Particles move the slowest in a solid because they are tightly packed and have less freedom of movement. In a solid, particles vibrate in fixed positions and cannot move around easily. On the other hand, particles move the quickest in a gas because they have the most freedom of movement. In a gas, particles are far apart and can move freely in all directions, colliding with each other and the walls of their container.

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  • 18. 

    Heating a material will ___________ particle motion

    • A.

      Increase

    • B.

      Decrease

    Correct Answer
    A. Increase
    Explanation
    Heating a material increases the kinetic energy of its particles, causing them to move more rapidly. This increase in kinetic energy leads to an increase in particle motion.

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  • 19. 

    Define: Viscosity

    • A.

      A Solid's internal resistance

    • B.

      A Liquid's internal resistance

    • C.

      A Gas's internal resistance

    Correct Answer
    B. A Liquid's internal resistance
    Explanation
    Viscosity refers to a liquid's internal resistance to flow. It is a measure of how easily a liquid can flow or how thick or sticky it is. Liquids with high viscosity, like honey or molasses, flow slowly and have a thick consistency, while liquids with low viscosity, like water, flow easily and have a thin consistency. Viscosity is determined by the intermolecular forces between the molecules of the liquid, with stronger forces resulting in higher viscosity.

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  • 20. 

    As temperature ____________ viscosity ___________

    • A.

      Increases viscosity Decreases

    • B.

      Decreases viscosity equals

    Correct Answer
    A. Increases viscosity Decreases
    Explanation
    As temperature increases, the viscosity of a substance decreases. This is because higher temperatures cause the molecules of the substance to move more quickly and have more kinetic energy. As a result, the molecules are able to overcome the attractive forces between them more easily, leading to a decrease in viscosity. Conversely, as temperature decreases, the molecules move more slowly and have less kinetic energy, making it more difficult for them to flow past each other, resulting in an increase in viscosity.

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  • 21. 

    Define: Buoyant Force

    • A.

      Tendancy of an object to float

    • B.

      Force acting on an object upward in a fluid

    • C.

      When a diver floats suspended in water

    Correct Answer
    B. Force acting on an object upward in a fluid
    Explanation
    The buoyant force refers to the force that acts on an object in an upward direction when it is submerged in a fluid. This force is exerted due to the pressure difference between the top and bottom of the object. The buoyant force allows objects to float or be suspended in a fluid, such as a diver floating in water.

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  • 22. 

    Define: Buoyancy

    • A.

      When a diver is suspended in water

    • B.

      A force acting on a object upward in a fluid

    • C.

      Tendancy of an object to float when placed in a fluid

    Correct Answer
    C. Tendancy of an object to float when placed in a fluid
    Explanation
    Buoyancy refers to the tendency of an object to float when placed in a fluid. It is a force that acts on an object upward in a fluid, such as water. When a diver is suspended in water, they experience buoyancy, which allows them to float instead of sinking. This phenomenon occurs because the fluid exerts an upward force on the diver that is equal to the weight of the fluid displaced by the diver's body. This upward force counteracts the force of gravity, resulting in the diver floating or being buoyant in the water.

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  • 23. 

    Define: ___________ is when a diver is suspended in water when the force of gravity equals the buoyant force

    • A.

      Neutral Buoyancy

    • B.

      Buoyancy

    • C.

      Buoyant force

    Correct Answer
    A. Neutral Buoyancy
    Explanation
    Neutral buoyancy is when a diver is suspended in water when the force of gravity equals the buoyant force. This means that the diver neither sinks nor floats, but remains in a state of equilibrium in the water. It occurs when the weight of the diver is equal to the upward force exerted by the water, allowing the diver to hover at a specific depth without the need to constantly swim or use additional weights. This state is essential for activities such as scuba diving and underwater photography, as it allows for easier maneuverability and precise control in the water.

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  • 24. 

    An object will sink when....

    • A.

      Gravity is less than the buoyant force

    • B.

      Gravity is greater than the buoyant force

    Correct Answer
    B. Gravity is greater than the buoyant force
    Explanation
    When gravity is greater than the buoyant force, an object will sink. Gravity is the force that pulls objects towards the center of the Earth, while the buoyant force is the upward force exerted by a fluid on an object submerged in it. If gravity is stronger than the buoyant force, the object will be pulled downwards more strongly than the fluid can push it upwards, causing it to sink.

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  • 25. 

    Define: Plimsoll Line

    • A.

      Where a ship is to be loaded

    • B.

      How heavy a ship is to be loaded

    • C.

      Where a ship is to be stopped

    Correct Answer
    B. How heavy a ship is to be loaded
    Explanation
    The Plimsoll Line is a reference mark located on the hull of a ship that indicates the maximum safe loading capacity. It helps determine how heavy a ship can be loaded without compromising its stability and safety. By ensuring that the ship does not exceed this limit, the Plimsoll Line helps prevent the risk of capsizing or sinking due to excessive weight. Therefore, the Plimsoll Line is primarily used to determine the appropriate weight at which a ship should be loaded.

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  • 26. 

    The "Bends" occurs when.....

    • A.

      A diver accesends to quickly in the ocean

    • B.

      A diver rises to quickly in the ocean

    Correct Answer
    A. A diver accesends to quickly in the ocean
    Explanation
    The "Bends" occurs when a diver ascends too quickly in the ocean. This is a condition known as decompression sickness, where nitrogen bubbles form in the body tissues due to the rapid decrease in pressure. These bubbles can cause various symptoms, including joint and muscle pain, dizziness, and even organ damage. It is important for divers to ascend slowly and follow proper decompression procedures to prevent the occurrence of the bends.

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  • 27. 

    Unit B When a  loud noise makes you jump, this is an example of a _________ _________

    • A.

      Loud Noise :D

    • B.

      Nervous System

    • C.

      Stimulus Response

    Correct Answer
    C. Stimulus Response
    Explanation
    When a loud noise makes you jump, it triggers a reflex action known as the stimulus response. In this case, the loud noise acts as the stimulus, which causes a quick and involuntary response from the nervous system, resulting in the jumping reaction. This reflex action is a protective mechanism that helps us react quickly to potential threats or danger.

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  • 28. 

    An increase in the number of cells in an organism is called ____________ & ____________

    • A.

      Adaptation and Evolving

    • B.

      Growth and Development

    Correct Answer
    B. Growth and Development
    Explanation
    The correct answer is "Growth and Development". This is because when the number of cells in an organism increases, it undergoes growth, which refers to an increase in size or mass. Additionally, this increase in cell number also contributes to the development of the organism, which involves the process of maturation and differentiation of cells and tissues to form a functional organism. Adaptation and evolving are not directly related to the increase in cell number, but rather refer to changes in the genetic makeup and characteristics of a population over time in response to environmental pressures.

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  • 29. 

    An animal changing color from white in the winter, to brown in the summer would be an example of ____________

    • A.

      How it evolves

    • B.

      Cells

    • C.

      Adaptation

    Correct Answer
    C. Adaptation
    Explanation
    The animal changing color from white in the winter to brown in the summer is an example of adaptation. This change in color allows the animal to blend in with its surroundings during different seasons, providing camouflage and increasing its chances of survival. Adaptation refers to the process by which organisms adjust to their environment in order to increase their fitness and chances of survival. In this case, the animal's ability to change color is a beneficial adaptation that helps it to better survive and avoid predators or capture prey.

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  • 30. 

    ____________ are the smallest functioning units of life.

    • A.

      Cells

    • B.

      Matter

    • C.

      Particles

    Correct Answer
    A. Cells
    Explanation
    Cells are the smallest functioning units of life. They are responsible for carrying out all the necessary functions required for an organism to survive and reproduce. Cells contain various organelles that perform specific tasks, such as energy production, protein synthesis, and DNA replication. They also have the ability to communicate with each other and coordinate their activities. Without cells, life as we know it would not be possible.

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  • 31. 

    Cells with similar functions are organized into ____________

    • A.

      Energy

    • B.

      Tissues

    • C.

      Transport Tissues

    Correct Answer
    B. Tissues
    Explanation
    Cells with similar functions are organized into tissues. Tissues are groups of cells that work together to perform a specific function in the body. They are specialized and have similar structures and functions. Tissues can be found in various parts of the body, such as the muscles, nerves, and organs. They allow for the efficient functioning of different systems in the body by coordinating and carrying out specific tasks.

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  • 32. 

    Tissues work together to form ____________ & __________  __________

    • A.

      Cells and cell systems

    • B.

      Organs and organs systems

    • C.

      Tissues and transport tissues

    Correct Answer
    B. Organs and organs systems
    Explanation
    Tissues work together to form organs and organ systems. This is because tissues are groups of cells that work together to perform a specific function, and organs are made up of different types of tissues that work together to perform a more complex function. Organ systems, on the other hand, are groups of organs that work together to perform a specific function for the organism as a whole. Therefore, the correct answer is organs and organ systems.

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  • 33. 

    Define: Diffusion

    • A.

      The tendancy of particles to pass througha semipermeable membrane

    • B.

      The movement of particles from one area to another

    Correct Answer
    B. The movement of particles from one area to another
  • 34. 

    Define: Osmosis

    • A.

      The tendancy of particles to pass through a semipermeable membrane

    • B.

      The movement of particles from one area to another

    Correct Answer
    A. The tendancy of particles to pass through a semipermeable membrane
    Explanation
    Osmosis is defined as the tendency of particles to pass through a semipermeable membrane. This means that particles, such as water molecules, move from an area of lower concentration to an area of higher concentration, in order to equalize the concentration on both sides of the membrane. The semipermeable membrane allows only certain particles to pass through, while blocking others based on their size or charge. This process is important in various biological and physical systems, such as the movement of water in plant cells or the filtration of waste materials in the kidneys.

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  • 35. 

    Define: Selectively Permeable

    • A.

      Movement of particles from one area to another

    • B.

      Movement of water through a permeable membrane

    • C.

      Movement of particles through a semipermeable membrane

    Correct Answer
    B. Movement of water through a permeable membrane
    Explanation
    The term "selectively permeable" refers to a membrane that allows certain substances or particles to pass through while restricting the passage of others. In this case, the correct answer is "movement of water through a permeable membrane." This means that water molecules can move across a membrane that is permeable to water, while other substances or particles may be blocked from passing through.

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  • 36. 

    The function of red blood cells in your body is to carry ___________ to all the cells of your body.

    • A.

      Oxygen

    • B.

      Co2

    • C.

      Waste

    Correct Answer
    A. Oxygen
    Explanation
    Red blood cells have a crucial role in transporting oxygen to all the cells of the body. Oxygen is necessary for cellular respiration, which is the process by which cells generate energy. Red blood cells contain a protein called hemoglobin that binds to oxygen in the lungs and carries it to tissues throughout the body. This oxygen-rich blood is then delivered to cells, where it is used for various metabolic processes. Therefore, the correct answer is oxygen.

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  • 37. 

    ____________ & ____________ are things that need to be removed from a cell.

    • A.

      Oxygen & Waste

    • B.

      Co2 & Waste

    • C.

      Co2 & Oxygen

    Correct Answer
    B. Co2 & Waste
    Explanation
    In a cell, carbon dioxide (Co2) and waste are the substances that need to be removed. Carbon dioxide is a waste product of cellular respiration, and it needs to be eliminated from the cell to maintain proper pH levels. Waste, which includes metabolic byproducts and other harmful substances, also needs to be removed to ensure the cell's health and functionality. Therefore, Co2 and waste are the correct choices for substances that need to be removed from a cell.

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  • 38. 

    Red blood cells do not carry ___________

    • A.

      Oxygen

    • B.

      Co2

    • C.

      Waste

    Correct Answer
    B. Co2
    Explanation
    Red blood cells do not carry carbon dioxide (Co2). Instead, they are responsible for carrying oxygen to the body's tissues. Red blood cells contain a protein called hemoglobin, which binds to oxygen in the lungs and transports it to cells throughout the body. Once the oxygen is released, red blood cells pick up carbon dioxide, a waste product of cellular respiration, and transport it back to the lungs to be exhaled. Therefore, the correct answer is Co2.

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  • 39. 

    Transport Tissues transport _________ & __________ to all parts of the plant.

    • A.

      Nutrients & Sunlight

    • B.

      Co2 & Oxygen

    • C.

      Food & Water

    Correct Answer
    C. Food & Water
    Explanation
    Transport tissues in plants, such as xylem and phloem, are responsible for transporting essential substances to all parts of the plant. In this case, the correct answer is "Food & Water" because these are the two main substances that are transported by the transport tissues. Food, in the form of sugars and other organic compounds, is transported from the leaves, where it is produced through photosynthesis, to other parts of the plant for growth and energy. Water is also transported from the roots to the rest of the plant, providing hydration and serving as a medium for nutrient uptake.

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  • 40. 

    Transport Tissues transport _________ & __________ to all parts of the plant.

    • A.

      Nutrients & Sunlight

    • B.

      Co2 & Oxygen

    • C.

      Food & Water

    Correct Answer
    C. Food & Water
    Explanation
    Transport tissues in plants, such as xylem and phloem, are responsible for transporting essential substances to all parts of the plant. These substances include food, which is produced in the leaves through photosynthesis and transported to other parts for growth and energy, and water, which is absorbed by the roots and transported to the rest of the plant for various metabolic processes. Therefore, the correct answer is "Food & Water."

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  • 41. 

    ____________ & ____________ are part of the transport tissue.

    • A.

      Pholem & Xylem

    • B.

      Oxygen & Co2

    • C.

      Pholem & Oxygen

    Correct Answer
    A. Pholem & Xylem
    Explanation
    Phloem and xylem are two types of transport tissues found in plants. Phloem is responsible for transporting nutrients, such as sugars, from the leaves to other parts of the plant, while xylem transports water and minerals from the roots to the rest of the plant. These tissues play a crucial role in the overall functioning and survival of the plant by ensuring the distribution of essential substances throughout its various parts.

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  • 42. 

    The role of circulatory system is.....

    • A.

      To deliver oxygen absorbed by the respiatory system

    • B.

      To deliver nutrients abosorbed by the digestive system

    Correct Answer
    B. To deliver nutrients abosorbed by the digestive system
    Explanation
    The circulatory system plays a crucial role in delivering nutrients absorbed by the digestive system to the body's cells and tissues. After digestion, nutrients are absorbed into the bloodstream through the walls of the small intestine. The circulatory system, specifically the blood vessels, then transport these nutrients throughout the body to provide energy and support various bodily functions. This process ensures that all cells receive the necessary nutrients for growth, repair, and maintenance.

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  • 43. 

    The _____________ circulatesblood through two ____________ loops.

    • A.

      The "heart" circulatesblood through two "ventricle" loops.

    • B.

      The "heart" circulates blood through two "sperate" loops.

    • C.

      The "kidney" circulates blood through two "ventricle" loops.

    Correct Answer
    B. The "heart" circulates blood through two "sperate" loops.
  • 44. 

    If a patient was having trouble breathing, the doctor would check a person's ____________ system.

    • A.

      Respiatory System

    • B.

      Circulatory System

    • C.

      Nervous System

    Correct Answer
    A. Respiatory System
    Explanation
    The correct answer is the Respiratory System. When a patient is having trouble breathing, it indicates a problem with their ability to take in oxygen and remove carbon dioxide. The respiratory system is responsible for these functions, which include the lungs, airways, and diaphragm. The doctor would assess the patient's respiratory system to determine the cause of the breathing difficulty and provide appropriate treatment.

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  • 45. 

    The part of the nervous system that is your control center for your whole body is the ____________

    • A.

      Hand

    • B.

      Spine

    • C.

      Brain

    Correct Answer
    C. Brain
    Explanation
    The brain is the control center for the whole body because it is responsible for coordinating and regulating all bodily functions. It receives and processes information from the senses, controls voluntary and involuntary movements, and is involved in cognitive processes such as thinking, memory, and emotions. Without the brain, the body would not be able to function properly and carry out essential tasks.

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  • 46. 

    The part ofthe nervous system that is your control center for your whole body is the ____________

    • A.

      Hand

    • B.

      Spine

    • C.

      Brain

    Correct Answer
    C. Brain
    Explanation
    The brain is the control center for the whole body as it receives and processes sensory information, initiates and controls movements, regulates bodily functions, and is responsible for higher cognitive functions such as thinking, memory, and emotions. It is the central organ of the nervous system and coordinates the activities of all other parts of the body, making it the correct answer.

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  • 47. 

    The largest organ in he human body is the ___________

    • A.

      Heart

    • B.

      Skin

    • C.

      Kidney

    Correct Answer
    B. Skin
    Explanation
    The skin is considered the largest organ in the human body because it covers the entire external surface. It serves as a protective barrier against pathogens, regulates body temperature, and helps in the excretion of waste products through sweat. The skin also contains various sensory receptors that allow us to perceive touch, pressure, and temperature. Overall, the skin plays a vital role in maintaining homeostasis and protecting the body from external threats.

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  • 48. 

    Define: Excretion

    • A.

      Removal of metobolic waste

    • B.

      Removal of Co2

    • C.

      Removal of waste

    Correct Answer
    A. Removal of metobolic waste
    Explanation
    Excretion refers to the process of eliminating metabolic waste from the body. This waste includes substances such as urea, uric acid, and excess salts that are produced as byproducts of cellular metabolism. The body excretes these waste products through various organs, including the kidneys, liver, and lungs. The removal of metabolic waste is essential for maintaining homeostasis and preventing the buildup of harmful substances in the body.

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  • 49. 

    Unit C A device that magnifies tiny objects is a _____________

    • A.

      Telescope

    • B.

      Microscope

    • C.

      Binoculars

    Correct Answer
    B. Microscope
    Explanation
    A microscope is a device that is used to magnify tiny objects. It is specifically designed to view objects that are too small to be seen by the naked eye. Telescopes are used to observe objects that are far away in space, while binoculars are used to view objects at a distance.

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  • 50. 

    The properties of light are....

    • A.

      Light travels in straight lines Light can be reflected Light can bend Light is a form of energy

    • B.

      Light travels in curvy lines Light can be reflected Light is a mixture of colours Light is a form of energy

    • C.

      Light travels in straight lines Light can be reflected Light can bend Light is a form of power

    Correct Answer
    A. Light travels in straight lines Light can be reflected Light can bend Light is a form of energy
    Explanation
    The properties of light mentioned in the answer are consistent with scientific understanding. Light does indeed travel in straight lines, as demonstrated by experiments such as the double-slit experiment. Light can also be reflected, as seen when light bounces off a mirror or other reflective surface. Light can bend when it passes through different mediums, such as when it enters water or a prism. Finally, light is a form of energy, which is evident in its ability to do work and its involvement in various physical processes.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 23, 2012
    Quiz Created by
    Poetryangel166
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