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. 2.

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

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

3. Read this first

   Use this

   model data, not to scale.

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 water moves toward the 1% side
   • Beaker A, because 1% is the smallest number
   • Beaker C, because 9% is the largest number
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 P, because the cell has more solute than P
   • Beaker R, because 12% is more than 6%
   • 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. Use this

   Beaker drawing (model data, not to scale).

8. 6.

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

   • Lysed, because the cell burst open
   • Normal, because water stops moving in strong salt water
   • Plasmolyzed, because water left the cell
   • Turgid, because the cell is full and firm
9. 7.

   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
   • Turgid, because water entered and the wall holds firm
   • Crenated, because the cell shrank with a crinkled edge
   • Plasmolyzed, because water left toward less solute
10. 8.

    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 X, because fresh water makes the cell burst
    • Drawing Y, because the 8% solution has more solute
    • Drawing Y, because salt moves into the cell
11. 9.

    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
12. 10.

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

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