What salty or fresh water does to plant and animal cells

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   “model data, not to scale” Ari drew a cell in salt water. The teacher says the solution is hypertonic to the cell. Which statement explains why?

   • The solution matches the cell, so water stops moving
   • Water moves toward the cell, which has less solute
   • The solution has more solute than the cell has
   • The cell has more solute than the solution has
2. 2.

   Beaker drawing (model data, not to scale). Bo's cell sits in beaker W. Which name fits the solution, and why?

   • Hypotonic, because it has less solute than the cell
   • Hypotonic, because water moves toward less solute
   • Hypertonic, because the cell has more solute than it has
   • Isotonic, because no water moves in or out

3. Read this first

   Use this

   model data, not to scale.

4. 3.

   The solution in Esme's beaker is isotonic to the cell. What happens to the water?

   • No water moves in or out of the cell
   • Water moves toward the side with less solute
   • Equal amounts move in and out, so the size holds
   • Salt moves into the cell until the sides match
5. 4.

   Jun compares three beakers around the same kind of cell. Which beaker holds a solution isotonic to the cell?

   • Beaker A, because water moves toward the 1% side
   • Beaker A, because 1% is the smallest number
   • Beaker C, because 9% is the largest number
   • Beaker B, because 4% matches the cell's 4%
6. 5.

   Kira looks at three beakers. In which beaker does the solution have more solute than the cell?

   • Beaker Q, because 6% matches the cell
   • Beaker R, because 12% is more than 6%
   • Beaker P, because water moves toward its smaller number
   • Beaker P, because the cell has more solute than P
7. 6.

   Luz sets three beakers around the same kind of plant cell. Which beaker's solution is hypotonic to the cell?

   • Beaker Z, because the cell's 3% is less than 10%
   • Beaker Z, because 10% is the largest number
   • Beaker Y, because water stops moving there
   • Beaker X, because 0% is less than the cell's 3%
8. 7.

   Milo compares three labeled red blood cell diagrams. Which diagram shows a red blood cell in a hypotonic solution?

   • Diagram Q, because no water moved in or out
   • Diagram R, because water moved into the cell
   • Diagram P, because water moved out of the cell
   • Diagram P, because it shows the smallest cell

9. Use this

   Beaker drawing (model data, not to scale).

10. 8.

    In Noah's drawing the membrane has pulled away from the wall. What is this state called, and why did it happen?

    • Plasmolyzed, because water left the cell
    • Lysed, because the cell burst open
    • Normal, because water stops moving in strong salt water
    • Turgid, because the cell is full and firm
11. 9.

    In Pia's drawing the plant cell is firm with no gap inside its wall. What is this state called, and why?

    • Lysed, because water entered and the cell burst open
    • Crenated, because the cell shrank with a crinkled edge
    • Turgid, because water entered and the wall holds firm
    • Plasmolyzed, because water left toward less solute
12. 10.

    The teacher dissolved each shell in vinegar beforehand. Tala reads that a teacher's shell-less egg lost mass in one beaker. Which drawing shows that, and why?

    • Drawing Y, because the egg took in water
    • Drawing X, because the egg took in sugar
    • Drawing Y, because water left the egg
    • Drawing X, because water left the egg