February 2025

Experiment: Testing the strength of various joints

By |2025-02-12T09:18:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Welding joints. Image credit youtube.com Welding joints. Image credit youtube.com ZIMSEC O Level Combined Science Notes:Experiment: Testing the strength of various joints

Aim: To test the strength of various joints in beams

Materials:  pieces of metal,poplar wood, glue, drawing pins/nails, bolts and nuts, old plastic rulers, burner, bricks/clamp, welding equipment/burner

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Dams

By |2025-02-12T09:33:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

An arch shaped dam wall. Image credit MediaWiki An arch shaped dam wall. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Dams

  • Dams usually fail due to lack of stability rather than lack of strength
  • The sideways thrust of dammed water can topple the wall
  • This thrust varies from when […]
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Introduction to diseases

By |2025-02-12T09:25:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Parirenyatwa entrance. Image credit financialgazette.co.zw Parirenyatwa entrance. Image credit financialgazette.co.zw ZIMSEC O Level Combined Science Notes: Introduction to diseases

  • A disease is an illness
  • Diseases are caused by pathogens
  • Pathogens come in the form of:
  • bacteria, viruses, fungi, protozoa(single celled animals) and small worms
  • Bacteria can be viewed using a light microscope

    • […]

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End products of photosynthesis and their fate

By |2025-02-12T09:44:27+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Image credit arboday.org Image credit arboday.org ZIMSEC O Level Combined Science Notes: End products of photosynthesis and their fate

  • Green leaves manufacture starch or sugar during the photosynthesis process
  • Oxygen is also given out.
  • The oxygen passes out of the leaves by the process of diffusion.
  • It diffuses into the surrounding air.
  • There are microscopic […]
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Poultry and Rabbit feeds

By |2025-02-12T09:29:54+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Poultry and Rabbit feeds

Chickens

  • Food forms the major part of costs when rearing poultry for eggs and meat.
  • It is therefore vital that the poultry  feed is obtained, mixed and given to chickens in the most economic and cost saving way.
  • The range of feed and the composition of the diet depends on […]
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Reproduction in Plants:Development after fertilization

By |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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