Organo-mineral colloidal complex of soil includes

Options

A. Humus
B. Clayparticles
C. Both 1 and 2
D. Clay, sand, silt & humus

Answer

To answer the question regarding the organo-mineral colloidal complex of soil, we can break down the concepts step by step:

### Step 1: Understand the Components
The question asks about the organo-mineral colloidal complex of soil. This complex is formed when organic matter (like humus) interacts with mineral particles (like clay).

**Hint:** Look for the definitions of organo-mineral complexes and their components.

### Step 2: Identify Organic Matter
Humus is a key component of soil organic matter. It is dark in color and contributes to the fertility of the soil. It is formed from the decomposition of plant and animal material.

**Hint:** Consider what organic materials are present in soil and their role in fertility.

### Step 3: Identify Mineral Particles
Clay particles are fine soil particles that are crucial in forming soil structure and retaining water and nutrients. They are part of the mineral component of the soil.

**Hint:** Recall the different types of soil particles and their sizes.

### Step 4: Combine the Components
The organo-mineral colloidal complex includes both humus (organic matter) and clay particles (mineral matter). Therefore, the correct answer must encompass both of these components.

**Hint:** Think about how organic and inorganic materials interact in soil.

### Step 5: Evaluate the Options
Now, let's look at the options provided:
1. Humus
2. Clay particle
3. Both 1 and 2
4. Clay, sand, salt, and humus

Since we established that the organo-mineral colloidal complex includes both humus and clay particles, the most accurate answer is "both 1 and 2."

**Hint:** Focus on the specific components mentioned in the question and eliminate options that do not fit the criteria.

### Final Answer
The organo-mineral colloidal complex of soil includes **both humus and clay particles**.