Pupil sheet · Osmosis
Osmosis — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. state
Which statement about a partially permeable membrane is correct?
Circle one answer.
- It lets every substance through
- It lets nothing through
- It lets small molecules such as water through, but holds back some larger molecules such as sucrose
- It lets only sugar through
2. describe
Describe two different jobs that water does as a solvent in the human body.
3. predict / explain
A bag of dialysis tubing holding water is tied to a capillary tube and stood in a concentrated sugar solution. Predict what happens to the level in the capillary tube, and explain your prediction.
4. complete
Complete the sentences about a plant cell placed in water.
A plant cell in water takes in water by …
and becomes …
The pressure of the contents on the wall is called …
The cell does not burst because of its …
5. calculate
A potato cylinder went from 1.50 g to 1.68 g in water. Calculate the percentage change in mass.
Percentage change in mass: ______________ unit ________
6. describe
Describe the difference between a flaccid plant cell and a plasmolysed plant cell.
7. sequence
Put the stages in order to show how water moves from the soil into a plant.
Write the number of each step in order.
- Water in the soil around the root hairs
- A root hair cell, by osmosis
- Cells across the root, by osmosis from cell to cell
- The tubes that carry water up the plant
- First: ______
- Second: ______
- Third: ______
- Last: ______
8. complete
Complete the sentences about red blood cells.
Pure water has a … water potential than the inside of a red blood cell
so water enters by …
The cell swells and …
because it has no …