Which of the following is not a organic matter in soil?

Options

A. Clay particles
B. Humus
C. Detritus
D. Litter

Answer

To determine which of the following is not an organic matter in soil, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand Organic Matter:**
Organic matter in soil refers to materials that are derived from living organisms, including plant and animal residues at various stages of decomposition.

2. **Evaluate Each Option:**
- **Option 1: Clay Particles**
- Clay particles are fine mineral particles that make up a significant portion of soil. They are inorganic and do not originate from living organisms.
- **Option 2: Humus**
- Humus is a dark organic material formed from the decomposition of plant and animal matter. It is a key component of soil organic matter.
- **Option 3: Detritus**
- Detritus consists of decomposing organic matter, including dead plant and animal material. It is organic in nature.
- **Option 4: Litter**
- Litter refers to dead plant material, such as leaves and twigs, that has fallen to the ground. It is also considered organic matter.

3. **Identify the Correct Answer:**
Based on the analysis, the only option that is not organic matter is **Option 1: Clay Particles**.

### Final Answer:
The correct answer is **Clay Particles**.

---