Gcse Biology Coursework Osmosis Variables

 

If the osmotic potential of the solution is the SAME as the water potentialof the cell, which in my case, is where the sucrose and distilled water bothhave the concentration of 0.5M. The solution is called isotonic.

HYPOTHESIS

From my background research, I predict that the more concentrated thesolution (the more sucrose it contains), the lower the osmotic potential is. The plant cell (in this case potato cell) would become flaccid, as water hasmoved out of the cell causing the mass to have decreased. Asconcentration of sucrose decreases, and the concentration of dilute waterincreases, the mass of the potato cell will become turgid and strong. It willgain mass as water diffuses into the cell.At concentration 0.5M, the solution will be isotonic; therefore, the % masschange should be at zero as no net osmosis should occur, therefore nowater should diffuse in or out of the cell, and so should not affect the massof the cell at all.I have planned a simple procedure in order to carry out this investigation:Apparatus/Equipments:

Sucrose Solution and Water (two beakers to hold them)

Weighing machine

Year 11 Biology Coursework 3

In an isotonicsolution, no netosmosis occurs. The cell is notplasmolysed, butit’s neither fullturgid either.For Example:Water potential of cytoplasm=- 50Osmotic potential of solution=- 50

(This is the osmotic pressure)

"Experiment To Investigate The Effect Of Osmosis In Potatoes" A Gcse Experiment Looking At The Effects Of The Concentration Of Sucrose Solution On Osmosis In Potato Tubers

Experiment to Investigate Osmosis in Potatoes

The aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain what osmosis is. Osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration. This definition contains three important statements:

a) It is the passage of water through a semi permeable membrane

b) It is the passage of water from a region of high water concentration

c) It is the passage of water to a region of low water concentration.

All the above statements are included in the definition, but define certain aspects of it.

Semi-permeable membranes are very thin layers of material which allow some things to pass through, but prevent others. A cell membrane is semi permeable. They allow small molecules like oxygen, water, amino acids etc. to pass through but will not allow larger molecules like sucrose, starch, protein etc. through. A region of high concentration of water is either a very dilute solution of something like sucrose or pure water. In each case there is a lot of water: a high concentration of water. A region of low water concentration is the opposite of the above, i.e. a very high concentration of sucrose solution: a low water concentration.

The water content of plants varies depending on environmental conditions. In Land plants this water plays a vital role in the support of tissues and the transport of materials around the organism. Lack of water leads to wilting and eventually death. Water is mainly absorbed through the roots, which are covered in specially adapted root hair cells, with large surface areas and thin cell walls to aid absorption. It is drawn up the plant through xylem vessels by a pull resulting from the evaporation of water through the stomata on the leaves. This evaporation is called transpiration and the xylem flow resulting is called the transpiration stream. Soluble food substances formed during photosynthesis are transported around the plant in the phloem tubes. This movement of water through the plant in the xylem vessels or phloem tubes is similar to the flow of blood in humans as it transports soluble mineral salts, nutrients and auxins, (plant hormones), from place to place. The evaporation of water from the leaves also removes heat energy from the plant and helps to prevent overheating.

Transpiration pulls water up the plant stem but osmosis is the process whereby water is drawn into or out of cells and tissues. Osmosis is the flow of water by diffusion through a differentially permeable membrane from areas of high water concentration to regions of low...

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