sexual reproduction Archives - Page 2 of 2 - Free ZIMSEC & Cambridge Revision Notes

Rhythm/Natural Family Planning

By garikaib|2025-02-12T09:38:33+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit atlantablackstar.com ZIMSEC O Level Combined Science Notes:Contraception:Rhythm/Natural Family Planning

How it works

Various techniques are used:
Learn to recognise the fertile periods in the menstrual cycle and avoid sex during that period
Several techniques are used to identify this fertile period:
1. The temperature method is when […]

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Contraception: The pill

By garikaib|2025-02-12T09:39:17+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit citifmonline.com ZIMSEC O Level Combined Science Notes:Contraception: The pill

Are also known as birth control pills (BCPs) or
Oral Contraceptive Pills (OCPs)

How it works

They contain the two female hormones: oestrogen and progesterone
They prevent the release of ova/female sex cells
They cause growth of an […]

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Injection (Depo Provera)

By garikaib|2025-02-12T09:40:01+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit star.ng ZIMSEC O Level Combined Science Notes:Contraception:Injection (Depo Provera)

Also simply known as Depo
It is an injection containing medroxyprogesterone, a contraceptive injection for women that contains the hormone progestin

How it works Depo provera injection

Prevents the […]

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Contraception: Male or Female condoms

By garikaib|2025-02-12T09:40:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

couple_smiling-min

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 […]

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Contraception: Diaphragm/Dutch cup

By garikaib|2025-02-12T09:41:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A married couple. Image credit rawstory.com ZIMSEC O Level Combined Science Notes:Contraception:Diaphragm/Dutch cup

Is also known as a cervical cap

How it works A diaphragm/cervical cap. Image credit path.org

Rubber cap/dome placed […]

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Contraception: The use of spermicides

By garikaib|2025-02-12T09:43:53+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Couple having dinner. Image credit singleblackmale.org ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

Spermicides are sperm killing chemicals

How it works

Are usually in the form of jelly cream placed into the vagina before sexual intercourse
The chemical kills spermatozoa

Effectiveness

60-95%

Advantages

Does not require […]

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Contraception: Loop/IUD (intrauterine device)

By garikaib|2025-02-12T09:44:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Black couple. Image credit classic105.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

How it works IUD IUD

Is a small copper/plastic device placed inside the uterus
It prevents the embryo from implanting in the uterus
by […]

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Contraception: Sterilisation

By garikaib|2025-02-12T09:45:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Black couple. Image credit blackcouplegetaways.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

How it works

Can be done in both men and women
In men it is known as a vasectomy
- Sperm duct is cut and tied
- During sexual intercourse ejaculated fluid contains no sperm

[…]

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Contraception: Abstinence

By garikaib|2025-02-12T09:46:09+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Couple holding hands. Image credit neguswhoread.com ZIMSEC O Level Combined Science Notes:Contraception: Abstinence

February 2025