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Top soil is rich mixture of humus and in...

Top soil is rich mixture of humus and inorganic salts in

A

Tropical rain forest

B

Temperate forest

C

Desert biome

D

Both A and B.

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**Step-by-Step Solution:** 1. **Understanding Topsoil Composition**: Topsoil is the uppermost layer of soil and is crucial for plant growth. It is primarily composed of a mixture of organic matter (humus) and inorganic materials (salts and minerals). 2. **Defining Humus**: Humus is the dark organic material in soil that forms from the decay of plant and animal matter. It improves soil fertility, moisture retention, and provides essential nutrients to plants. 3. **Identifying Inorganic Salts**: Inorganic salts in topsoil come from weathered rocks and minerals. They include essential nutrients like nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, which are vital for plant health. 4. **Role of Topsoil**: The rich mixture of humus and inorganic salts in topsoil supports a diverse ecosystem of microorganisms, insects, and plant roots, making it a critical component for agriculture and natural vegetation. 5. **Conclusion**: Thus, topsoil is a rich mixture of humus and inorganic salts that provides the necessary nutrients and structure for healthy plant growth. ---
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