January 2023

Cells in parallel

By |2022-09-15T12:38:39+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Cells in parallel Cells in parallel ZIMSEC O Level Combined Science Notes:  Cells in parallel

  • As alternative to arranging cells in series
  • Cells can be arranged in parallel to one another
  • This results in an increase in amperage capacity
  • This results in cells lasting longer
  • When cells are arranged in parallel
  • The […]
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Electrical safety

By |2022-09-15T12:38:31+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Safe use of electricity .Image credit keyword-suggestions.com Safe use of electricity .Image credit keyword-suggestions.com ZIMSEC O Level Combined Science Notes: Electrical safety

  • Electrical safety is important as electric shocks can be lethal and improper use of electricity can result in fires
  • The following precautions can be taken when using electricity:
  • Wearing […]
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Machines:Levers

By |2022-09-15T12:38:16+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Machines:Levers

  • A lever is a very simple machine
  • It is made up of a rigid bar resting on a pivot,
  • used to move a  load with one end
  • by applying an effort on the other end
  • Examples of machines that use the lever are:
  • scissors, human arm, hand pump, claw hammer, shovel

 

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Diseases: Malaria

By |2022-09-15T12:37:58+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The female anopheles mosquito. Image credit abrushwithafrica.com The female anopheles mosquito. Image credit abrushwithafrica.com ZIMSEC O Level Combined Science Notes: Diseases: Cholera

  • Malaria is deadly disease
  • It is caused by (the pathogen) a group of protozoa (single-celled animal) called Plasmodium
  • The protozoa lives in the female Anopheles mosquito and in humans

NB Mosquitos do […]

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Managing Ecosystems

By |2022-09-15T12:37:44+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The savannah. Image credit wildnatureinstitute.org The savannah. Image credit wildnatureinstitute.org ZIMSEC O Level Combined Science Notes: Managing Ecosystems

  • The ecosystem needs to looked after to ensure it is in balance
  • Humans can have good or bad effects on the ecosystem
  • Soil is an especially important component of the Zimbabwean ecosystem because […]
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The structure of the leaf and photosynthesis

By |2022-09-15T12:41:55+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The external structure of the leaf. Image credit passmyexams.co.uk The external structure of the leaf. Image credit passmyexams.co.uk ZIMSEC O Level Combined Science Notes: The structure of the leaf and photosynthesis

  • The leaves are the main organs of photosynthesis.
  • Their structure is adopted for the process of photosynthesis.
  • Veins-vein networks support the physical structure […]
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The respiratory system and gaseous exchange

By |2022-09-15T12:41:46+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Human respiratory system. Image credit anatrik.org Human respiratory system. Image credit anatrik.org ZIMSEC O Level Combined Science Notes: The respiratory system and gaseous exchange

  • The respiratory system is responsible for gaseous exchange and breathing so that oxygen is taken into the body and carbon dioxide is released from the body.
  • Mammals including […]
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