Tonicity Practice Test Questions And Answers

Reviewed by Stephen Reinbold
Stephen Reinbold, PhD, Biological Sciences |
Biology Expert
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Stephen Reinbold has a Ph.D. in Biological Sciences with a particular interest in teaching. He taught General Biology, Environmental Science, Zoology, Genetics, and Anatomy & Physiology for almost thirty years at Metropolitan Community College in Kansas City, Missouri. He particularly enjoyed emphasizing scientific methodology and student research projects. Now, enjoying retirement, he works part-time as an editor while also engaging in online activities.
, PhD, Biological Sciences
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Tonicity Practice Test Questions And Answers - Quiz

Have you studied tonicity? To test your knowledge, you can take this tonicity practice test. Osmosis, in simple terms, is the movement of solvents from a higher solute concentration to the lower one through a semipermeable membrane. In the quiz below, you will get to test your understanding of different tonic solutions and how a solute is transferred. How about you try it out and see what you may learn about osmosis as a whole. All the best! You can share this informative quiz with others also.


Questions and Answers
  • 1. 

    Click all the boxes that apply. The movement of molecules from an area of Higher Concentration to an area of Lower Concentration

    • A.

      Diffusion

    • B.

      Osmosis

    • C.

      Hypotonic

    • D.

      Isotonic

    Correct Answer
    A. Diffusion
    Explanation
    Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. This movement occurs due to the random motion of particles and does not require any external energy input. Therefore, diffusion is the correct answer for the given statement. Osmosis, hypotonic, and isotonic are not applicable in this scenario as they specifically refer to the movement of water molecules across a selectively permeable membrane.

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  • 2. 

    Equal amount of solute and solvent in and out of a cell is called.

    • A.

      Isotonic

    • B.

      Hypotonic

    • C.

      Hypertonic

    • D.

      None of the above

    Correct Answer
    A. Isotonic
    Explanation
    Isotonic refers to a solution where the concentration of solute is equal to the concentration of solvent. In the context of a cell, an isotonic solution means that the concentration of solute inside the cell is the same as the concentration of solute outside the cell. This balance of solute and solvent allows for an equal movement of water in and out of the cell, resulting in no net change in cell volume.

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  • 3. 

    Why do your fingers Prune when in the water for a long time?

    • A.

      Osmosis

    • B.

      Diffusion

    • C.

      Hypotonic

    • D.

      Hypertonic

    Correct Answer
    A. Osmosis
    Explanation
    When your fingers are in water for a long time, osmosis occurs. Osmosis is the process by which water molecules move from an area of lower solute concentration (hypotonic) to an area of higher solute concentration (hypertonic) through a semipermeable membrane, such as the skin. In this case, the water in the surrounding environment enters the skin cells of your fingers, causing them to swell and prune.

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  • 4. 

    Water is a hypotonic solution.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Water is considered a hypotonic solution because it has a lower solute concentration compared to the solute concentration inside cells or other solutions. When a cell is placed in a hypotonic solution, water molecules move into the cell through osmosis, causing the cell to swell or even burst. This is because the concentration of solutes inside the cell is higher than that in the surrounding hypotonic solution, creating a concentration gradient that drives water movement.

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  • 5. 

    Soda drinks are what kind of solution?

    • A.

      Hypertonic

    • B.

      Hypotonic

    • C.

      Isotonic

    • D.

      None

    Correct Answer
    A. Hypertonic
    Explanation
    Soda drinks are hypertonic solutions because they have a higher concentration of solutes (such as sugar and carbon dioxide) compared to the concentration of solutes in our body fluids. When we consume soda, the higher concentration of solutes in the drink draws water out of our cells through osmosis, leading to dehydration.

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  • 6. 

    Blood is what kind of solution?

    • A.

      Isotonic

    • B.

      Hypertonic

    • C.

      Hypotonic

    • D.

      None

    Correct Answer
    A. Isotonic
    Explanation
    Blood is classified as an isotonic solution because it has the same concentration of solutes as the cells in the body. This means that the concentration of dissolved substances, such as electrolytes and proteins, in the blood is balanced and allows for the proper functioning of cells. An isotonic solution is important for maintaining cell shape and preventing osmotic imbalances, making it the ideal environment for cells to function optimally.

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  • 7. 

    What kind of solution is it if the cell grows when placed in the solution?

    • A.

      Hypotonic

    • B.

      Hypertonic

    • C.

      Isotonic

    • D.

      None

    Correct Answer
    A. Hypotonic
    Explanation
    If a cell grows when placed in a solution, it means that the solution has a lower solute concentration compared to the cell's cytoplasm. In a hypotonic solution, water moves into the cell through osmosis, causing the cell to swell and grow. Therefore, the correct answer is hypotonic.

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  • 8. 

    A ________ solution would cause a cell to shrink. 

    Correct Answer
    hypertonic
    Explanation
    A hypertonic solution refers to a solution that has a higher concentration of solutes compared to the concentration inside the cell. When a cell is exposed to a hypertonic solution, water molecules move out of the cell through osmosis, causing the cell to shrink or shrinkage of the cell.

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  • 9. 

    A hypertonic solution would cause

    • A.

      Water to enter the cell

    • B.

      Water to leave the cell

    • C.

      Water to evaporate

    • D.

      All of the above

    • E.

      All of the above

    Correct Answer
    B. Water to leave the cell
    Explanation
    A hypertonic solution has a higher concentration of solutes compared to the cell. This creates a concentration gradient, causing water to move out of the cell in an attempt to equalize the concentration on both sides of the cell membrane. Therefore, the correct answer is "water to leave the cell".

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  • 10. 

    A Hypotonic solution has a ______________ concentration of solute (dissolved stuff) than inside the cell.

    • A.

      Lower

    • B.

      Higher

    • C.

      Equal

    • D.

      None of the above

    Correct Answer
    A. Lower
    Explanation
    A hypotonic solution has a lower concentration of solute than inside the cell. This means that there are fewer dissolved substances in the solution compared to the inside of the cell. As a result, water molecules will move into the cell through osmosis, causing the cell to swell or potentially burst if the solution is extremely hypotonic.

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  • 11. 

    If a cell is placed in a HYPOTONIC solution, the water will move into the cell, causing it to swell.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    When a cell is placed in a hypotonic solution, it means that the concentration of solutes outside the cell is lower than inside the cell. This creates a concentration gradient, causing water to move from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell). As a result, water enters the cell, causing it to swell. Therefore, the statement "If a cell is placed in a HYPOTONIC solution, the water will move into the cell, causing it to swell" is true.

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  • 12. 

     Movement of anything from an area of high concentration to low concentration.

    • A.

      Diffusion

    • B.

      Osmosis

    • C.

      Hypertonic

    • D.

      None of the above

    Correct Answer
    A. Diffusion
    Explanation
    Diffusion is the process of movement of particles or molecules from an area of high concentration to an area of low concentration. It occurs due to the random motion of particles and does not require any external energy. This process helps in achieving equilibrium and equal distribution of particles. Osmosis, on the other hand, refers specifically to the diffusion of water molecules across a selectively permeable membrane. Hypertonic refers to a solution with a higher solute concentration compared to another solution. None of the above options are correct as the correct answer is diffusion.

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  • 13. 

    In a hypotonic solution, the total molar concentration of all dissolved solute particles is greater than that of another solution

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    In a hypotonic solution, the total molar concentration of all dissolved solute particles is actually lower than that of another solution. This means that there are fewer solute particles in the hypotonic solution compared to the other solution. As a result, water molecules tend to move into the hypotonic solution in order to equalize the concentration, causing the cells in the hypotonic solution to potentially swell or burst.

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  • 14. 

    When a cell is exposed to hypotonic conditions, there is net water movement into the cell?

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    When a cell is exposed to hypotonic conditions, it means that the concentration of solutes outside the cell is lower than inside the cell. This creates a concentration gradient that drives water molecules to move into the cell in an attempt to equalize the concentration on both sides of the cell membrane. Therefore, there is a net movement of water into the cell, making the statement "True" correct.

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  • 15. 

    Hypotonic solution means more solute and less water.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The explanation for the given answer is that a hypotonic solution actually has less solute and more water. In a hypotonic solution, the concentration of solute particles is lower compared to the concentration of water molecules. This causes water to move into the cells through osmosis, leading to cell swelling or bursting. Therefore, the statement that a hypotonic solution means more solute and less water is incorrect.

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  • 16. 

    Plant cells take water by  Osmosis in a hypertonic solution

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Plant cells take in water by osmosis in a hypotonic solution, not a hypertonic solution. In a hypertonic solution, the solute concentration is higher outside the cell than inside, which causes water to move out of the cell, potentially leading to cell shrinkage. In a hypotonic solution, the solute concentration is lower outside the cell, causing water to move into the cell, which is typically how plant cells maintain turgor pressure and stay rigid.

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  • 17. 

    ___________ prevents a plant cell from bursting when kept in a hypotonic solution.

    Correct Answer
    cell wall, Cell wall, Cell Wall
    Explanation
    The cell wall is a rigid structure that surrounds the cell membrane in plant cells. It provides support and protection to the cell, preventing it from bursting when placed in a hypotonic solution. In a hypotonic solution, the concentration of solutes outside the cell is lower than inside the cell, causing water to enter the cell. Without the cell wall, the cell membrane would stretch and potentially burst due to the influx of water. The cell wall maintains the shape and integrity of the cell, allowing it to withstand the pressure exerted by the hypotonic solution.

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  • 18. 

    What is the movement of water in and out of the cell membrane called?

    • A.

      Osmosis

    • B.

      Diffusion

    • C.

      Hypotonic

    • D.

      Isotonic

    Correct Answer
    A. Osmosis
    Explanation
    Osmosis is the movement of water in and out of the cell membrane. It is the process by which water molecules move from an area of lower solute concentration to an area of higher solute concentration through a selectively permeable membrane. This movement of water helps to maintain the balance of solute concentration inside and outside the cell. Diffusion, hypotonic, and isotonic are not the correct terms to describe the movement of water in and out of the cell membrane.

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  • 19. 

    What would happen to a cell placed if it is in a hypertonic solution?

    • A.

      The cell would expand and possibly burst

    • B.

      The cell would dance and do the Nay Nay!

    • C.

      The cell would shrink.

    • D.

      The cell would remain the same.

    Correct Answer
    C. The cell would shrink.
    Explanation
    When a cell is placed in a hypertonic solution, it means that the concentration of solutes outside the cell is higher than inside the cell. This creates a concentration gradient that causes water to move out of the cell, resulting in the cell shrinking. The higher concentration of solutes outside the cell causes water to flow out in order to balance the concentration on both sides of the cell membrane. As a result, the cell loses water and shrinks in size.

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Stephen Reinbold |PhD, Biological Sciences |
Biology Expert
Stephen Reinbold has a Ph.D. in Biological Sciences with a particular interest in teaching. He taught General Biology, Environmental Science, Zoology, Genetics, and Anatomy & Physiology for almost thirty years at Metropolitan Community College in Kansas City, Missouri. He particularly enjoyed emphasizing scientific methodology and student research projects. Now, enjoying retirement, he works part-time as an editor while also engaging in online activities.

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