January 2023

Biological components of the soil

By |2022-09-15T12:40:25+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Worms are part of the soil's biological components. Image credit wageingenur.nl

Worms are part of the soil’s biological components. Image credit wageingenur.nl ZIMSEC O Level Combined Science Notes: Biological components of the soil
  • In addition to physical components the soil also has biological components as well
  • These include living plants, animals and […]

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Experiment: Finding soil organisms

By |2022-09-15T12:40:25+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Finding soil organisms.

Finding soil organisms. ZIMSEC O Level Combined Science Notes: Experiment: Finding soil organisms

Materials: digging tools, pen and paper, tweezers, gauze, beaker, filter tunnel, light bulb, clamp stand, microscope/hand lens, containers

Method

  • Go out and look for soil organisms. Look for things such as holes in the soil
  • Take soil samples
  • Set up […]

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Experiment: Testing for the presence of micro-organisms in soil

By |2022-09-15T12:40:24+02:00January 24th, 2023|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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Experiment: Calculating the water and organic content of soil

By |2022-09-15T12:40:24+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Soil has got organic content. Image credit manicapost.com

Soil has got organic content. Image credit manicapost.com ZIMSEC O Level Combined Science Notes: Experiment: Calculating the water and organic content of soil

Materials: soil sample, burner, balance, evapourating dish basin, tongs, water bath

Method

  1. This burns off the organic content of the soil
  2. Roast the […]

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2022 O Level Results Out

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