Movement Into and Out of Cells

Name the substance absorbed by plants using the process of osmosis.

______

The diagram represents osmosis taking place between two sucrose solutions of different concentrations.

Identify E, F and G.

molecule E ______

structure F ______

molecule G ______

Explain, with reference to the diagram, how osmosis takes place.

Define osmosis and explain why osmosis is a special form of diffusion.

Explain the importance of active transport in the human alimentary canal.

Explain what is meant by each of the following terms and describe one example of each in either a plant or an animal:

diffusion, ______

active transport. ______

Starch is a carbohydrate stored inside plant cells.

Explain why starch is a more suitable storage substance than glucose.

active transport

osmosis.

Explain what happens to a red blood cell when it is placed in pure water.

With reference to named parts of the cell, describe changes in the appearance of the cell after being placed in the concentrated salt solution.

Explain how the changes you have described in (a) have occurred.

Explain the importance of active transport in plants and in humans.

in plants ______

in humans ______

Explain what is meant by the term diffusion.

Explain why respiration depends on the process of diffusion.

Describe the functions of the cell membrane.

Explain the advantages to a plant of having its cell membranes surrounded by cell walls.

Describe how water is taken up from the soil into the cytoplasm of the cell shown in Fig. 4.1.

Using Fig. 4.2, describe the effect of increasing oxygen concentration in the soil on the rate of ion uptake.

Suggest how most ions are taken up during section X and section Y on Fig. 4.2. Give an explanation for your answers.

process during section X ______
process during section Y ______

explanation

Suggest a reason for the shape of the graph during section Z on Fig. 4.2.