January 2023

Experiment To show the effect of sulphuric acid on some materials

By |2022-09-15T12:38:19+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The effects of acid rain. Image credit penguinsofchemistry.wordpress.com The effects of acid rain. Image credit penguinsofchemistry.wordpress.com ZIMSEC O Level Combined Science Notes: Experiment To show the effect of sulphuric acid on some materials

Aim: To show the effect of sulphuric acid on some materials

Materials: dilute sulphuric acid, wood, copper, plastic, iron, steel, aluminium, […]

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Food Preservation

By |2022-09-15T12:38:04+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Perishable foods Perishable foods ZIMSEC O Level Combined Science Notes: Food Preservation

  • A lot of the fresh food that humans eat is perishable
  • This is because this food is also food for bacteria, fungi and other micro-organisms
  • If fresh perishable food is left out in the open it will soon deteriorate […]
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Pregnancy

By |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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Photosynthesis

By |2022-09-15T12:41:57+02:00January 24th, 2023|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 |2022-09-15T12:41:50+02:00January 24th, 2023|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 |2022-09-15T12:40:36+02:00January 24th, 2023|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 |2022-09-15T12:40:29+02:00January 24th, 2023|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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