Diffusion And Osmosis Worksheet 5z4z57

Crescent Girls’ School Secondary Two Science Diffusion & Osmosis – WS 1

Established 1956

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Section A. Multiple Choices Question [15 marks] 1. Which of the following factors must be present for diffusion to take place? I difference in concentration of particles in the two regions. II difference of concentration of water molecules in two regions. III presence of a partially permeable membrane. A. I B. II

C. I, II D. I, II, III

2. Which of the following factors must be present for osmosis to take place? I A partially permeable membrane must be present. II Water molecules must be present. III There must be a difference in liquid concentration. IV The presence of a membrane is not necessary. A. I & II B. I & III

C. I, II & III D. I, II, III & IV

3. Which of the following processes is responsible for spreading the molecules of insecticide from one corner of a room to another? A. Osmosis B. Diffusion

C. Convection D. Radiation

4. Plants absorb nutrients through the process ________ and water through the process ______. A. osmosis, diffusion B. diffusion, osmosis

C. osmosis, osmosis D. diffusion, diffusion

5. The rate of diffusion is slowest in A. Solids B. Liquids

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C. Gases D. Water

Sec 2 Science

6. Diffusion between two solutions stops when the solutions A. B. C. D.

become homogeneous become heterogeneous start to dissolve in each other are of different concentration

7. Which of the following states of matter can diffusion occur in? A. B. C. D.

Solids and Liquids Solids and Gases Liquids and Gases Solids, Liquids and Gases

8. Water molecules move from a _______ solution to a _______ solution during osmosis. A. diluted, concentrated B. concentrated, diluted

C. acidic, alkaline D. alkaline, acidic

9. A cellophane bag containing starch solution and red ink is placed in a beaker of water. Which of the following will take place? A. B. C. D.

The cellophane bag will swell when starch molecules enter. The cellophane bag will shrink when starch molecules leave. The water in the beaker will turn red. Nothing takes place.

10. A cellophane bag containing starch solution and red ink is placed in a beaker of water. Which of the following will occur as a result of osmosis? A. B. C. D.

The cellophane bag swells because water enters it. The cellophane bag shrinks as starch molecules leave it. Starch molecules will be seen in the water. The water in the beaker will turn red.

11. A Visking tubing is filled with liquid X which is immersed into a beaker containing liquid Y. Which of the following combinations of liquids X and Y will cause the tubing to swell?

I II III IV

Concentration of Liquid X 20g of sugar in 100cm3 of water 10g of sugar in 100cm3 of water 20g of sugar in 100cm3 of water 20g of sugar in 100cm3 of water

A. I B. II

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Concentration of Liquid Y 20g of sugar in 100cm3 of water 20g of sugar in 100cm3 of water 10g of sugar in 100cm3 of water 40g of sugar in 200cm3 of water C. III D. IV

Sec 2 Science

12. Regions X and Y were separated by a partially permeable membrane. In which of the following set-ups will there be a net movement of water molecules from Y to X? Setup I II III IV

Contents in Region X

Contents in Region Y

diluted glucose solution Water water diluted glucose solution

water diluted glucose solution concentrated glucose solution concentrated glucose solution

A. I B. II

C. III D. IV

13. What does plasmolysis mean? A. B. C. D.

It It It It

is is is is

a form of diffusion where the plant cell gains water. an extreme form of osmosis where the plant cell loses excess water. the movement of nutrients into the plant cell by osmosis. the movement of water molecules into the roots of a plant.

14. Active transport is different from osmosis and diffusion in that A. B. C. D.

molecules move into a cell much faster. molecules involved in active transport are much smaller. molecules move only in the presence of light. molecules move from a region of lower concentration to a region of higher concentration.

15. A cellophane bag containing starch solution and red ink is placed in a beaker of water. What is the function of the cellophane bag? A. B. C. D.

To To To To

prevent prevent prevent prevent

starch molecules from diffusing out into the beaker of water. starch molecules from diffusing into the bag. red ink molecules from diffusing out into the beaker of water. red ink molecules from diffusing into the bag.

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Sec 2 Science

Section B. Short Structured Question [10 marks] 7. A Visking tubing containing red ink solution is tied and placed into a beaker of concentrated sucrose solution. The set-up is left to stand for an hour. (a) What would you observe at the end of the experiment? The Visking tubing will contain a mixture of red ink and water solution . [1] (b) State the molecules that have moved across the Visking tubing. Water molecules that have moved across the Visking tubing. [1] (c) Explain what you have observed in part (a) above. The water molecules are small enough to through the small holes of the Visking tube known as the pores . Water molecules diffuses from the beaker (higher concentration of water molecules ) into the Visking tubing (lower concentration of water molecules) by osmosis . Thus the water molecules and red ink molecules are found in the visking tubing . 3] 2. An animal cell was placed in a mixture containing a high concentration of glucose, protein and starch in water. (a) Name the substance(s) that can enter the cell by diffusion. Glucose can enter the cell by diffusion . [1] (b) State the function of the cell membrane. The cell membrane controls the movement of the substances moving in and out of the cell . _____________________________________________________________________[2] (c) Explain your answer to part (a) above. __Glucose molecules are small enough to diffuse through the cell membrane into the cell unlike the starch and protein molecule which are too large to diffuse through the cell membrane . 2]

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Sec 2 Science