Agricultural Science
WAEC 2020
(a) What is the aim of the experimental set-up F?
(b) List three materials that could be used in carrying out the experiment in the set-up F.
(c) Outline three steps invołved in carrying out the experiment.
(d) Name four soil components observed in the experimental set-up.
(e) Draw and label the experimental set-up.
Explanation
(a) Aim of the experiment set-up F:
- Determination of Soil texture by sedimentation/sedimentation experiment
(b) Materials that could be used in carrying out the experiment in the set-up F:
- Soil sample,
- Measuring cylinder,
- Beaker,
- Glass jar,
- Water,
- Glass rod/ stirrer,
- Hydrogen peroxide/Calgon
(c) Steps involved in carrying out the experiment:
- Put a quantity of soil sample in the measuring cylinder,
- Water is added to the soil sample in the measuring cylinder,
- Hydrogen peroxide could be added to break soil lumps,
- The content in the measuring cylinder is n stirred with a glass rod/shake vigorously,
- The content is allowed to settle for some hours.
(d) Soil components observed in the experimental set-up:
- Coarse sand,
- Silt, Water,
- Fine sand,
- Clay,
- Organic matter
(e) Drawing of the experimental set up;
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