Test Index

WAEC Agriculture 2022 Paper

Question : 13

Total: 47

Volume of soil and water=78cm³

Solution:

Concept:

Porosity is the percentage of total soil volume occupied by pore spaces.

Explanation:

Volume of dry soil sample

= 52\,\mathrm{cm}^3

Volume of water added

= 48\,\mathrm{cm}^3

Total volume before mixing

= 52 + 48 = 100\,\mathrm{cm}^3

Volume after mixing soil and water

= 78\,\mathrm{cm}^3

So volume of air space in the soil

= 100 - 78 = 22\,\mathrm{cm}^3

Porosity

= \frac{\text{volume of air space}}{\text{volume of dry soil}} \times 100

Porosity

= \frac{22}{52} \times 100 = 42.31\%

Answer:

42.31\%

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