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 cell has more solute than the solution has
   • The solution matches the cell, so water stops moving
   • Water moves toward the cell, which has less solute
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 water moves toward less solute
   • Hypotonic, because it has less solute than the cell
   • Isotonic, because no water moves in or out
   • Hypertonic, because the cell has more solute than it has

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?

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

   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 the cell has more solute than P
   • Beaker P, because water moves toward its smaller number
6. 5.

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

   • Beaker X, because 0% is less than the cell's 3%
   • Beaker Y, because water stops moving there
   • 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 Q, because no water moved in or out
   • Diagram P, because water moved out of the cell

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?

   • Plasmolyzed, because water left the cell
   • Normal, because water stops moving in strong salt water
   • Turgid, because the cell is full and firm
   • 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?

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

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

    • Drawing X, because the stiff wall squeezes the water out
    • Drawing Y, because the 8% solution has more solute
    • Drawing Y, because salt moves into the cell
    • Drawing X, because fresh water makes the cell burst
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 water left the egg
    • Drawing X, because the egg took in sugar
    • Drawing Y, because water left the egg