Dark coloured soils are considered most fertile as they contain:
Correct answer: C. Clay and humus
- A. Gravel and sand
- B. Sand and calcium
- C. Clay and humus
- D. Silt and earthworms
Explanation
Dark soil usually contains abundant humus, and clay helps retain water and plant nutrients through its high surface area. Sand and gravel do not account for the dark colour or high fertility.
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Practise Forest Ecology
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