O Level Science Notes Archives - Page 13 of 33 - Free ZIMSEC & Cambridge Revision Notes

Photosynthesis
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Photosynthesis

Notes, O Level Science Notes, Ordinary Level Notes

Photosynthesis

By garikaib|2025-02-12T09:33:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science: Photosynthesis

Green plants are the food and oxygen producers of the living world.
They manufacture organic molecules from inorganic raw materials.
Animals rely on green plants to make food that provides them with energy and oxygen.
Green plants are thus known as producers and animals are in turn known as consumers.
Only green plants […]

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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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Plant transport and the structure of plants

By garikaib|2025-02-12T08:57:35+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

tomato_plant-min Tomato Plant. image credit wisegeek.com ZIMSEC O Level Combined Science Notes: Plant transport and the structure of plants

Plants have two main organ systems: a shoot system and a root system

Tomato plant structure. Image credit […]

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The mammal heart

By garikaib|2025-02-12T09:20:21+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The structure of the human heart. ZIMSEC O Level Combined Science Notes: The mammal heart

Is made up of muscle which contracts continuously throughout the mammal’s life.
The number of contractions differ from mammal to mammal
In elephants it contracts about 25 times/minute
In humans it contracts about 70-80 […]

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Experiment comparing the particle size of soils

By garikaib|2025-02-12T09:40:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Soil sedimentation test. ZIMSEC O Level Combined Science Notes: Experiment comparing the particle size of soils

Materials: samples of sandy, loamy and clay soils, 3 measuring cylinders/tall transparent containers, water

Method

Place sample of each soil sample into a tall container to about a quarter of its height
Add water to until […]

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Artificial Ecosystems

By garikaib|2025-02-12T09:04:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A maize field is an example of an artificial ecosystems. Image wordpress.com ZIMSEC O Level Combined Science Notes: Artificial Ecosystems

An artificial ecosystem is one that is heavily influenced by human activities
The practice of mono-culture, crop production and the […]

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An introduction to Beams and their types

By garikaib|2025-02-12T09:45:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

beams_introduction-min Common types of beams and their associated forces ZIMSEC O Level Combined Science Notes: An introduction to Beams and their types

A beam is any material that is supported so that it can hold a load
A simple beam is a length of material e.g steel supported along its length so that […]

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Experiment: Heating metals in air

By garikaib|2025-02-12T09:32:58+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Burning metals in air, Magnesium oxide. Heating metals in air, Magnesium oxide. ZIMSEC O Level Combined Science Notes: Experiment: Heating metals in air