Image credit star.ng ZIMSEC O Level Combined Science Notes:Contraception:Injection (Depo Provera)
How it works 
Depo provera injection
Smog in China. Image credit ctvnews.ca ZIMSEC O Level Combined Science Notes: Environmental Health: Air pollution
Potted plant. Image credit hotstyledesign.com ZIMSEC O Level Combined Science: The test for starch
Aim: To test whether light is required for the photosynthesis process.
Materials
A potted plant, cardboard or aluminum foil, scissors, paper clips or tape, equipment for the start test.
Method ![Image credit [...]
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Image credit necessarywriters.com ZIMSEC O Level Shona Notes: Kupatsanura Zviito
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
A bird pollinating a flower. Image credit gilligalloubird.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Examining adaptations of flowers to pollination
Materials: maize(male and female) or any type of grass flowers, bean flowers or any insect pollinated flowers, hand lenses, microscope slides, […]
Testing infiltration in soils ZIMSEC O Level Combined Science Notes: Testing the infiltration capacity of soils
Materials: Tins with their tops and bottoms removed, water
Method
The three isotopes of hydrogen. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Isotopes and the importance of proton numbers
The greater the depth of a beam the more load it can support ZIMSEC O Level Combined Science Notes: The relationship between a beam’s strength and depth
The reactivity series. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Predicting reactions of a metal using the reactivity series