sexual reproduction Archives - Free ZIMSEC & Cambridge Revision Notes

Contraception: Abstinence

By garikaib|2022-09-15T12:37:50+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Couple holding hands. Image credit neguswhoread.com

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

It involves total avoidance of sexual intercourse

Adavantages

Many couples agree to wait until marriage
There is no risk of contracting Sexually Transmitted Infections
It is 100% effective
It is supported by most religious […]
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Causes of infertility

By garikaib|2022-09-15T12:37:49+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Sterility can cause strain in a relationship. Image credit colossiansfamilynetwork.org

Sterility can cause strain in a relationship. Image credit colossiansfamilynetwork.org ZIMSEC O Level Combined Science Notes: Causes of infertility

Sterility is the inability to reproduce
There are a number of causes for sterility
Low sperm count (makes it […]
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Reproduction in Humans

By garikaib|2022-09-15T12:37:56+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A Zimbabwean family

A Zimbabwean family ZIMSEC O Level Combined Science Notes: Reproduction in Humans

Human being produce sexually
The process involves the fusion (joining) of the nuclei (sex cells) of the male gamete (sperm)
and the female gamete (ovum)
To form a zygote
The human and female sexual organs take […]
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Sexually Transmitted Infections (STIs)

By garikaib|2022-09-15T12:37:49+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit singleblackmale.org

Image credit singleblackmale.org ZIMSEC O Level Combined Science Notes: Sexually Transmitted Infections (STIs)

To access more topics go to the Combined Science Notes page

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Male Reproductive system

By garikaib|2022-09-15T12:37:55+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit raanetwork.org

Image credit raanetwork.org ZIMSEC O Level Combined Science Notes: Male Reproductive system

The diagram below shows the reproductive system of a man

Male reproductive system. Image credit goldiesroom.org

Testes-this is where sperms are made.

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Population Dynamics

By garikaib|2022-09-15T12:37:48+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit idealscounseling.org

Image credit idealscounseling.orgZIMSEC O Level Combined Science Notes: Population Dynamics

Population-all the inhabitants of a particular place/area at one given time
The study of changes in population is known as demograph

Factors affecting population change

The birth rate-the number of live births per 1000 people per year.
Death/Mortality rate-is the number of […]
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Female Reproductive system

By garikaib|2022-09-15T12:37:55+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit huffpost.com

Image credit huffpost.com ZIMSEC O Level Combined Science Notes: Female Reproductive system

The diagram below shows the reproductive system of a female

Female reproductive system

Ovaries-there are two ovaries
- Their function is to produce and release ova […]
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Effects of population growth on natural resources

By garikaib|2022-09-15T12:37:48+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Environmental degradation in Epworth. Image credit newsday.co.zw

Environmental degradation in Epworth. Image credit newsday.co.zw ZIMSEC O Level Combined Science Notes: Population and natural resources

Environmental Effects

Soil erosion
Deforestation
Desertification
Reduced soil fertility

Social Effects

Overcrowding
Criminal activities
Immorality
Poor health services
Poor education facilities
General increase in poverty

To […]

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The menstrual cycle

By garikaib|2022-09-15T12:37:54+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit lifestylechallenge.deborahgabriel.com

Image credit lifestylechallenge.deborahgabriel.com ZIMSEC O Level Combined Science Notes: The menstrual cycle

The reproductive cycle in females is called the menstrual/estrus cycle
It has an average of 28 days
It varies from individual to individual but it follows a set pattern
The cycle is regulated by hormones produced […]
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Pregnancy
Gallery
Pregnancy

Notes, O Level Science Notes, Ordinary Level Notes

Pregnancy

By garikaib|2022-09-15T12:37:54+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Pregnancy

The vagina receives an erect penis during sexual intercourse
During sexual intercourse, sperms are ejaculated into the vagina
There they begin to swim up to the oviducts
If an ovum is released at this time it may be fertilised in the oviduct
Although many sperms reach the ovum only one will […]
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January 2023

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2022 O Level Results Out