A person tying the visking tubing. Image credit YouTube. ZIMSEC O Level Combined Science Notes:Diffusion and Osmosis experiments
Aim: Create a membrane model for molecules and their movement.
Materials
Visking tubing/egg membrane, string, beaker, 20% sugar solution, weighing balance, water.
Method A
Tomato Plant. image credit wisegeek.com ZIMSEC O Level Combined Science Notes: Plant transport and the structure of plants
Tomato plant structure. Image credit […]
A celery plant in dye. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Investigating the movement of water within plants
Aim: To demonstrate that moves up plants which have a transportation system.
Materials: Young plants with roots/celery plants, water, hand lenses, razor blade/scalpel, food colouring/dye.
Method
Tree roots. Image credit lawnsite.com ZIMSEC O Level Combined Science Notes: Examining the structure of stems and roots
Aim: To examine the structure of roots and stems under a microscope/bio-viewer.
Materials: Bio-set and bio-viewers, microscopes, prepared slides of root and stem sections.
Method ![Structure of roots. [...]
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Coloured ink droplets falling and diffusing in a glass of water. Image credit pinterest.com ZIMSEC O Level Combined Science Notes:The movement of molecules
