February 2025

Diseases: Malaria

By |2025-02-12T09:26:39+02:00February 12th, 2025|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 |2025-02-12T09:10:48+02:00February 12th, 2025|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 |2025-02-12T08:56:55+02:00February 12th, 2025|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 |2025-02-12T09:34:21+02:00February 12th, 2025|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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Reproduction in plants: Comparing different plant seeds and fruits

By |2025-02-12T09:31:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Different fruits showing their seeds. Image credit blogspot.com Different fruits showing their seeds. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Reproduction in Plants:Comparing different fruits and seeds  

Materials: a variety of fruits

Method

  1. Collect and gather different types of fruits that are found in your area
  2. Group the fruits […]
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Experiment: Testing for the presence of micro-organisms in soil

By |2025-02-12T08:57:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing for organisms in the soil. Testing for organisms in the soil. ZIMSEC O Level Combined Science Notes: Experiment: Testing for the presence of micro-organisms in soil

Material:2 test tubes, lime water/bicarbonate indicator, cotton thead, corks, muslin cloth or cotton material, burner

Method

  1. Put a sample of fresh soil (about 50g mass) in a muslin […]
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