February 2025

Experiment: To compare the resistance of different woods to termite attack

By |2025-02-12T09:28:10+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Treated poles. Image credit lynnridgetimbers.co.za Treated poles. Image credit lynnridgetimbers.co.za ZIMSEC O Level Combined Science Notes: Experiment: To compare the resistance of different woods to termite attack

Aim: To compare the resistance of different types of wood to termite attack

Materials: gloss paint, used motor oil, creosote, 4 samples of softwood (pine), 4 samples of […]

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The concept of pressure

By |2025-02-12T08:59:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

 ZIMSEC O Level Combined Science Notes: The concept of pressure
  • Pressure is the force acting over an area
  • In such pressure is usually the force per unit area exerted by a fluid/gas
  • over a surface with which it is in contact
  • \text{Pressure=} \dfrac{Force}{Area}
  • If a big force is exerted over a small area it results high pressure
  • An example […]
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Experiment: Finding conditions necessary for growth of microorganisms

By |2025-02-12T09:19:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Mouldy bread and their conditions. Image credit Mouldy bread and their conditions. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Finding conditions necessary for growth of microorganisms

Aim: To determine factors affecting the growth of microorganisms in food

Materials:  3 containers with sterilized lids, brad, milk, burners, drying agent (calcium chloride)

Method

  1. Pour […]
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Contraception:Ways to prevent pregnancy

By |2025-02-12T09:37:24+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

There are several major methods of contraception. Image credit relationshipplaybook.com There are several major methods of contraception. Image credit relationshipplaybook.com ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

  • Contraception-the deliberate use of artificial methods or other techniques to prevent pregnancy as a consequence of sexual intercourse
  • Common methods of contraception […]
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Photosynthesis

By |2025-02-12T09:33:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science: Photosynthesis

  • Green plants are the food and oxygen producers of the living world.
  • They manufacture organic molecules from inorganic raw materials.
  • Animals rely on green plants to make food that provides them with energy and oxygen.
  • Green plants are thus known as producers and animals are in turn known as consumers.
  • Only green plants […]
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Digestive systems of cows and rabbits

By |2025-02-12T09:17:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Cows. Image credit creativeblogs.net Cows. Image credit creativeblogs.net ZIMSEC O Level Combined Science Notes: Digestive systems of cows and rabbits

  • Cows and rabbits are examples of herbivores.
  • They feed on plants e.g. grass and leaves.
  • Pant structures contain a large amount of cellulose which cannot be digested easily.
  • Cellulose is a fibrous carbohydrate.
  • Much […]
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The mammal heart

By |2025-02-12T09:20:21+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The structure of the human heart. The structure of the human heart. ZIMSEC O Level Combined Science Notes: The mammal heart

  • Is made up of muscle which contracts continuously throughout the mammal’s life.
  • The number of contractions differ from mammal to mammal
  • In elephants it contracts about 25 times/minute
  • In humans it contracts about 70-80 […]
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Experiment comparing the particle size of soils

By |2025-02-12T09:40:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Soil sedimentation test. Soil sedimentation test. ZIMSEC O Level Combined Science Notes: Experiment comparing the particle size of soils  

Materials: samples of sandy, loamy and clay soils, 3 measuring cylinders/tall transparent containers, water

Method

  1. Place sample of each soil sample into a tall container to about a quarter of its height
  2. Add water to until […]
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