Test Index

WAEC Agriculture 2020 Paper

Question : 12

Total: 50

Solution:

Concept:

Humus percentage is calculated from the loss in soil mass after burning, compared with the original dry mass.

Explanation:

Original oven-dried soil mass is

8\ \mathrm{g}

Mass remaining after complete burning is

1.6\ \mathrm{g}

This loss in mass represents the humus burnt away.

Mass of humus

= 8 - 1.6 = 6.4\ \mathrm{g}

Percentage of humus

= \frac{6.4}{8} \times 100 = 80\%

Answer:

D. 80%

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