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प्रश्न
Top-soil contains the following
विकल्प
Humus and living organisms only
Humus and soil particles only
Humus, living organisms and plants
Humus, living organisms and soil particles.
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उत्तर
Humus, living organisms and soil particles.
Explanation:
Topsoil is the soil's top and outermost layer. which is typically 2 to 8 inches thick. It is often black in colour because of humus. which is partially decaying organic matter, soil particles and live creatures such as soil bacteria, among other things.
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