The process of decay of dead orgnaic matter is known as

Options

A. denitrification
B. nitrification
C. nitrogen fixation
D. ammonification

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the process that involves the decay of dead organic matter. This is a key concept in the study of mineral nutrition and nutrient cycling in ecosystems.

2. **Identifying the Options**: The options given are:
- Denitrification
- Nitrification
- Nitrogen fixation
- Ammonification

3. **Analyzing Each Option**:
- **Denitrification**: This process involves the conversion of nitrates in the soil back into nitrogen gas, which is released into the atmosphere. It is not directly related to the decay of organic matter.
- **Nitrification**: This is the process where ammonia is oxidized to nitrites and then to nitrates. It involves the transformation of nitrogen compounds but does not pertain to the decay of organic matter.
- **Nitrogen Fixation**: This process converts atmospheric nitrogen into ammonia, making it available for plants. It does not involve the decay of organic matter.
- **Ammonification**: This is the process where organic nitrogen from dead plants and animals is decomposed and converted into ammonia. This process is directly related to the decay of organic matter.

4. **Conclusion**: Based on the analysis, the correct answer is **Ammonification**, as it specifically refers to the decay of dead organic matter and the conversion of organic nitrogen into ammonia.

**Final Answer**: The process of decay of dead organic matter is known as **Ammonification**.

---