February 2025

Mineral Nutrition Experiment

By |2025-02-12T08:58:42+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Phosphorus Deficiency. Image credit iastate.edu Phosphorus Deficiency. Image credit iastate.edu ZIMSEC O Level Notes Combined Science: Mineral Nutrition Experiment

Aim: Investigating the effects of mineral elements on plant growth.

Materials

Young wheat or pea seedlings, test tubes, mineral solutions/culture solutions, cotton wool, foil or black paper, stands for test tubes.

Method

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Products of digestion and the Absorption and Assimilation processes

By |2025-02-12T09:39:12+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Human nails, one of the products of assimilation. Image credit arithmaroo.com Human nails, one of the products of assimilation. Image credit arithmaroo.com ZIMSEC O Level Combined Science Notes:Products of digestion and the Absorption and Assimilation processes

  • After food has been digested in can now be used.
  • The end products ( which would […]
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Nutrition

By |2025-02-12T09:11:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A balanced diet. Image credit healthandstylish.com A balanced diet. Image credit healthandstylish.com ZIMSEC O Level Combined Science Notes: Nutrition

  • Nutrition is that branch of science that deals with nutrients and nutrition especially in humans
  • It is concerned with  ensuring that humans are eating foods that provide necessary nutrients for health and growth
  • Nutrients […]
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Advantages and disadvantages of vegetative production

By |2025-02-12T09:36:14+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sugarcane field. Image credit gov.ph Sugarcane field. Image credit gov.ph ZIMSEC O Level Combined Science Notes: Reproduction in plants: Advantages and disadvantages of vegetative (asexual) production  

  • A lot of plants which grow using the vegetative method of reproduction are able to produce seeds
  • They use vegetative reproduction because it has certain advantages

Advantages

  • New […]
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Breeding

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

SeedCo trial fields are used for breeding seeds. Image credit seedco.co SeedCo trial fields are used for breeding seeds. Image credit seedco.co ZIMSEC O Level Combined Science Notes: Breeding

  • Controlled breeding in livestock and crops allow farmers to obtain animals and crops with the best characteristics
  • Each breed or variety has is […]
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Experiment: The heating curve of water

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

The heating curve of water. Image credit wordpress.com The heating curve of water. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: The heating curve of water

Materials: beaker, crushed ice, thermoter, burner, clock/watch with a stop watch function

Method

  1. Half fill a beaker with crushed ice
  2. Record the temperature of the ice
  3. Place […]
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Experiment: Testing the physical properties of metals and non-metals

By |2025-02-12T09:23:02+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Common non-metals. Image credit blogspot.com Common non-metals. Image credit blogspot.com ZIMSEC O Level Combined Science Notes: Experiment: Testing the physical properties of metals and non-metals

Aim:To examine the physical properties of metals and non-metals

Materials: aluminium foil, carbon rod taken from a torch cell, copper foil, gas jars of oxygen, hydrogen; sulpher, […]

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Experiment: Investigating the rusting of iron

By |2025-02-12T08:56:58+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Investigating the rusting or iron Investigating the rusting of iron ZIMSEC O Level Combined Science Notes: Experiment: Investigating the rusting of iron

Aim: Investigating the rusting (oxidation) of iron

Materials: 4 iron nails, 1 steel nail, a piece of copper/brass, 5 test tubes, cotton wool, solid calcium chloride, magnesium ribbon

Method

  1. Half fill two test tubes with […]
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Experiment: The effects of a catalyst on the rate of a reaction

By |2025-02-12T09:17:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Copper (II) can be used as a catalyst. Image credit chemistry-reference.com Copper (II) can be used as a catalyst. Image credit chemistry-reference.com ZIMSEC O Level Combined Science Notes: Experiment: The effects of a catalyst on the rate of a reaction

Aim: To investigate the effects of a catalyst on a reaction using […]

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Galvinasing iron

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

Corrugated iron sheets are galvanised. Image credit alibaba.com Corrugated iron sheets are galvanised. Image credit alibaba.com ZIMSEC O Level Combined Science Notes: Galvinasing iron

  • Galvanising is one of the methods used to prevent iron from rusting
  • Iron and steel can be coated with zinc
  • Zinc is a fairly more reactive metal

    • […]

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