Lesson eLearning

Which of the following best explains why soil colour changes when it is dry?

hard MCQ 3 marks Class 4 · EVS · Abdul in the Garden
  1. Loss of moisture makes it lighter
  2. Addition of fertilizer changes colour
  3. Soil becomes more humid
  4. Plants grow deeper roots
Answer
Loss of moisture makes it lighter

The correct answer is Loss of moisture makes it lighter — Compare the dry and wet soil to confirm the colour change.

Step-by-step solution

  1. Observe soil before drying – it looks dark due to water content.
  2. Dry the soil by exposing it to air; water evaporates from the particles.
  3. As water leaves, the soil particles become less dense and reflect more light.
  4. This increased light reflection makes the soil appear lighter in colour.
  5. Compare the dry and wet soil to confirm the colour change.
Common mistake: Attributing colour change to fertilizer

Concept tested: Effect of moisture on soil colour

Published · How this solution was prepared and checked

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