Substance abuse: Drugs
Man smoking mbanje. Image credit thyblackman.com ZIMSEC O Level Combined Science Notes: Substance Abuse: Drugs
February 2025
Contraception: Male or Female condoms
ZIMSEC O Level Combined Science Notes:Contraception: Male or Female condoms
- Are one of the most commonly used contraceptives
How it works 
Images credit netdoctor.co.uk
- The male condom is used to sheath(cover) an erect penis just before sex
- The female condom is […]
The purification of Water
Water Purification Plant. Image credit cdrmaguire.com ZIMSEC O Level Combined Science Notes: The purification of Water
- Large residential areas such as Harare, Chitungwiza and other urban establishments are supplied with piped running water
- This water is treated so that it is safe to drink and […]
Productivity Agreements, Commissions, Salary
Salary gives status and flexibility. Image credit blogspot.comZIMSEC O Level Business Studies Notes: Productivity Agreements, Commissions, Salary
- A commision -is a form of remuneration that is based on total sales
- It is a common form of payment with sales agents, insurance brokers etc
- It is paid upon […]
Product based Organisational structure
An example of Product Based Organisational structure.
ZIMSEC O Level Business Studies Notes: Product based Organisational structure
- This is when organisational operations, departments, duties and tasks are grouped based on particular lines of goods and services.
- The organisation’s structure is based on major product […]
Ways of communicating in business
Phones are a popular means of communication within businesses. Image credit accessableliving.com
ZIMSEC O Level Business Studies Notes: Leadership:Ways of communicating in business
- There are multiple ways of communication within businesses
- Sometimes the word methods of communication is used to refer to ways of communication
- Each way has it’s own advantages […]
The differences between Early Iron Age and Late Iron Age
ZIMSEC O Level History Notes: Early Societies (Late Stone Age – Early Iron Age): The differences between Early Iron Age and Late Iron Age
- Here is a summary of the differences between Late Iron Age and Early Iron Ages
To access more topics go to the History Notes page.
The Mfecane
The Zulu Army modern reenactment. Image credit britishempire.co.uk
ZIMSEC O Level History Notes: Crisis in Nguniland: The Mfecane
- It means a time of crushing
- It was also given a Sesotho name called Difaqane or Lifaqane
- It was a time of widespread warfare and disorder indigenous groups in Southern Africa from about 1815 […]
Terms used in Population studies
ZIMSEC O Level Geography Notes:Population Studies:Terms used in Population studies
- Birth Rate (or crude birth rate) is the number of live births per 1,000 of the population in a given year. (Not to be confused with the growth rate).
- Brain Drain is the emigration of a significant proportion of a country’s highly […]
Problems faced by the Ndebele during their journey from Zululand
Ndebele village circa 1890. Image credit wordpress.com
ZIMSEC O Level History Notes: The Ndebele State:Problems faced by the Ndebele during their journey from Zululand
- These are some of the problems faced by the Ndebele/Khumalo on their way from Zululand to Western Zimbabwe:
- Families were separated when the Ndebele were moving to Zimbabwe
[…]