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

2. Read this first

   Use this

   model data, not to scale.

3. 2.

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

   • Salt moves into the cell until the sides match
   • Equal amounts move in and out, so the size holds
   • No water moves in or out of the cell
   • Water moves toward the side with less solute
4. 3.

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

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

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

   • Beaker P, because water moves toward its smaller number
   • Beaker R, because 12% is more than 6%
   • Beaker P, because the cell has more solute than P
   • Beaker Q, because 6% matches the cell
6. 5.

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

   • Beaker Y, because water stops moving there
   • Beaker X, because 0% is less than the cell's 3%
   • Beaker Z, because the cell's 3% is less than 10%
   • Beaker Z, because 10% is the largest number
7. 6.

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

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

8. Use this

   Beaker drawing (model data, not to scale).

9. 7.

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

   • Turgid, because the cell is full and firm
   • Normal, because water stops moving in strong salt water
   • Plasmolyzed, because water left the cell
   • Lysed, because the cell burst open
10. 8.

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

    • Crenated, because the cell shrank with a crinkled edge
    • Plasmolyzed, because water left toward less solute
    • Turgid, because water entered and the wall holds firm
    • Lysed, because water entered and the cell burst open
11. 9.

    Ren wants the drawing where water left the cell. Which drawing shows that, and why?

    • Drawing Y, because salt moves into the cell
    • Drawing Y, because the 8% solution has more solute
    • Drawing X, because fresh water makes the cell burst
    • Drawing X, because the stiff wall squeezes the water out
12. 10.

    (model data, not to scale). Zee wants the drawing with no net movement of water. Which drawing shows that, and why?

    • Drawing Y, because most water moves toward less solute
    • Neither drawing, because water stops moving when sides are equal
    • Drawing X, because as many arrows go in as go out
    • Drawing Y, because the cell has more solute than the solution