Notes Archives - Page 14 of 189 - Free ZIMSEC & Cambridge Revision Notes

Introduction and importance of population studies

By garikaib|2025-02-12T08:56:31+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

A child holding a clinic card. Image credit BBC ZIMSEC O Level Geography Notes: Population:Introduction and importance of population studies

Population studies is the scientific study of human populations
It entails the study of:

population numbers
Their growth and decline
deaths
births

[…]

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Food types and their importance

By garikaib|2025-02-12T09:11:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Different types of food have different functions. Image credit healthydietadvisior.com ZIMSEC O Level Combined Science Notes: Food types and their importance

Carbohydrates-these are energy-rich foods that are largely made up of starch and sugars. They are easily broken down in the […]

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Reproduction in Plants:Development after fertilization

By garikaib|2025-02-12T09:29:14+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A flower fertilisation. Image credit studyblue.com Fertilisation of a flower. Image credit studyblue.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Reproduction in Plants:Development after fertilization

Once the ovules inside the ovary have been fertilized a lot of changes takes place
The fertilized ovules develop into seeds inside the ovary
The ovary […]

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Experiment: Testing the alkalinity/acidity of the soil

By garikaib|2025-02-12T09:45:43+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing the PH of soil. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Testing the alkalinity/acidity of the soil

Materials: Universal indicator/PH paper/PH Test meter, distilled water, test tubes, soil samples

Method

Place the soil samples into test tubes to a height of about […]

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Molecules

By garikaib|2025-02-12T09:07:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Molecules of carbon, oxygen, hydrogen and water ZIMSEC O Level Combined Science Notes: Molecules

A molecule is the smallest particle of a compound formed when atoms of elements combines
The atoms combine together by forming bonds
When these bonds are formed there are energy changes
Typically heat energy […]

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Population distribution

By garikaib|2025-02-12T09:22:10+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

World population distribution. Image credit MediaWiki ZIMSEC O Level Geography Notes: Population:Population distribution

Population distribution is the spread of people over an area, country or region
In the past population distribution was mainly influenced by natural factors such as soil fertility and the environment
Whilst natural factors […]

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Reasons why Zimbabwe was colonised

By garikaib|2025-02-12T08:56:00+02:00February 12th, 2025|Notes, O Level History Notes, Ordinary Level Notes|

Cecil John Rhodes. Image credit MediaWiki ZIMSEC O Level History Notes: The Colonisation of Zimbabwe:Reasons why Zimbabwe was colonized

There were several reasons why Zimbabwe was turned into a colony by the BSAC
Some these reasons include:
In order for Cecil John Rhodes to fulfill his Cape […]

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Deficiency Diseases

By garikaib|2025-02-12T09:16:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Iodised salt can prevent iodine deficiency ZIMSEC O Level Combined Science Notes: Deficiency Diseases

A person might suffer from a deficiency disease if their diet lacks certain essential minerals and vitamins
Two essential minerals and vitamins are:
Iodine and
Vitamins

Iodine Goitre is a [...]
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