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JAMB Biology 1989 Question 46

Question 46

Soil

5 g of oven dried soil was heated in a furnace for 24 hours. After cooling, it weighed 4.8 g. What is the amount of humus in the soil?

  1. A.40.0g per 100 g dry soil
  2. B.4.4g per 100 g dry soil
  3. C.4.0 g per 100 g dry soil
  4. D.0.4g per 100 g dry soil
Show the answer and explanation

Answer: C (4.0 g per 100 g dry soil)

Explanation

Humus burnt off = 5 − 4.8 = 0.2 g in 5 g of soil, which is 0.2 × 100/5 = 4.0 g per 100 g.