Experiment to Shoew the Effect of Different Concentration of Glucose on Potato Strips
EXPERIMENT TO SHOW THE EFFECT OF DIFFERENT CONCENTRATION OF GLUCOSE ON POTATO STRIPS
INTRODUCTION: Molecules of liquid and gas are constantly in motion, they move randomly in all directions and bounce around in all directions and bounce around and into each other. As they move, they tend to spread out moving from areas with many molecules to areas with fewer molecules . This process of spreading out is called Diffusion, for example smell of cooking travelling around the house from the kitchen, circulation of oxygen from the alveolar air space to the lungs, smell of perfume in the air.
However there is a specialized type of diffusion called Osmosis. This is when water molecules moves from a region of high concentration of water to a region of low concentration of water thru a semi-permeable membrane. Osmosis will only occur thru a semi-permeable membrane (that is a membrane which selectively allows passage of certain types of molecules through it while restricting the movement of others)
Examples of Osmosis includes
a) The absorption of water by plants roots to maintain shape and stiffness.
b) Elimination of wastes such as sweat and urine
c) Movements of water and other solvents membranes thru cell walls/membranes.
AIMS: This experiment is going to look at the effect of different concentrations of glucose (Independent variables) on potato strips (dependent variables) of the same length and variety under the same condition.
HYPOTHESIS: Plants cells behave differently in glucose solution of varying concentration by a process known as Osmosis. Plants cells will go flaccid or shrink in an hypertonic solution, a solution with low water concentration and high glucose concentration as water will move from the cell (high water concentration) to its surrounding. Turgid (swell up) in hypotonic concentration a solution with high water concentration and low glucose concentration due to water moving from surrounding high water concentration into the plant
INTRODUCTION: Molecules of liquid and gas are constantly in motion, they move randomly in all directions and bounce around in all directions and bounce around and into each other. As they move, they tend to spread out moving from areas with many molecules to areas with fewer molecules . This process of spreading out is called Diffusion, for example smell of cooking travelling around the house from the kitchen, circulation of oxygen from the alveolar air space to the lungs, smell of perfume in the air.
However there is a specialized type of diffusion called Osmosis. This is when water molecules moves from a region of high concentration of water to a region of low concentration of water thru a semi-permeable membrane. Osmosis will only occur thru a semi-permeable membrane (that is a membrane which selectively allows passage of certain types of molecules through it while restricting the movement of others)
Examples of Osmosis includes
a) The absorption of water by plants roots to maintain shape and stiffness.
b) Elimination of wastes such as sweat and urine
c) Movements of water and other solvents membranes thru cell walls/membranes.
AIMS: This experiment is going to look at the effect of different concentrations of glucose (Independent variables) on potato strips (dependent variables) of the same length and variety under the same condition.
HYPOTHESIS: Plants cells behave differently in glucose solution of varying concentration by a process known as Osmosis. Plants cells will go flaccid or shrink in an hypertonic solution, a solution with low water concentration and high glucose concentration as water will move from the cell (high water concentration) to its surrounding. Turgid (swell up) in hypotonic concentration a solution with high water concentration and low glucose concentration due to water moving from surrounding high water concentration into the plant
References: 1. Biology online Dictionary available : www.biology.online.org/cell last accessed 25 April 2011 2. Bill Indge et al (2000) A New Introdection to Biology Hodder & Stoughton Educatioal press London. 3. Cells available: www.bbc.co.uk/bilesize biology GCSE last accessed 28th April 2011. 4. Ian Emerson Osmosis and Difusion - A Tutorial Available www.mun.ca/biology/osmosis last accessed 25th April 2011 5. Steve Potter (2004) AS Human Biology unit I Cells Information Press Eynsham ,Oxford