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JAMB Biology 1980 Question 45

Question 45

Soil

A few grams of dried soil were first heated until red hot and then further heated until no more smoke was released. This experiment was to determine the

  1. A.amount of water in soil
  2. B.percentage of water in soil
  3. C.presence of humus in soil
  4. D.resistance of laterites to heat
  5. E.release of smoke from the soil.
Show the answer and explanation

Answer: C (presence of humus in soil)

Explanation

The soil was already dry, so the loss on strong heating comes from humus (organic matter) burning away.