science notes Archives - Page 5 of 32 - Free ZIMSEC & Cambridge Revision Notes

Digestive systems of cows and rabbits

By garikaib|2025-02-12T09:17:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Cows. Image credit creativeblogs.net ZIMSEC O Level Combined Science Notes: Digestive systems of cows and rabbits

Cows and rabbits are examples of herbivores.
They feed on plants e.g. grass and leaves.
Pant structures contain a large amount of cellulose which cannot be digested easily.
Cellulose is a fibrous carbohydrate.
Much […]

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Examining the structure of stems and roots

By garikaib|2025-02-12T09:02:04+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

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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Reproduction in plants: Flowers and Pollination

By garikaib|2025-02-12T09:24:25+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The basic structure of a flower: showing the reproductive organs ZIMSEC O Level Combined Science Notes: Reproduction in plants: Flowers and Pollination

Most plants have female and male sex cells which join at fertilization to produce seeds
This is known as sexual reproduction
Flowers are the reproductive organs […]

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Experiment: Comparing the water holding capacity of the soil

By garikaib|2025-02-12T09:42:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the water holding capacity of soil ZIMSEC O Level Combined Science Notes: Comparing the water holding capacity of the soil

Materials: Measuring cylinders, funnels, cotton wool, water, dry soil samples, stop watch/clock

Method

Set up your apparatus as shown in the diagram
Add known volume of water
Measure […]

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Elements and the proton number

By garikaib|2025-02-12T09:06:13+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Elements arranged according to their proton number. Image credit wallpapercave.com ZIMSEC O Level Combined Science Notes: Elements and the proton number

The atoms of different elements are different from each other
This is because they have different numbers of protons and neutrons
Each […]

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Strength to Mass ratio

By garikaib|2025-02-12T09:13:19+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The cross section of beams ZIMSEC O Level Combined Science Notes: Strength to Mass ratio

Engineers do away with materials that are under little stress so as to be able to build efficient structures in terms of weight and cost
The material that lies close to the neutral […]

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The reaction of metals with dilute acids
Gallery
The reaction of metals with dilute acids

Notes, O Level Science Notes, Ordinary Level Notes

The reaction of metals with dilute acids

By garikaib|2025-02-12T09:38:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: The reaction of metals with dilute acids

Metals also react with dilute acids such as
Dilute hydrochloric acid
Hydrogen gas is released as a by product of the reaction
Metals such as calcium, magnesium and zinc that react with water react even more vigorously with dilute acids
Metals that react with […]

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