Which factor/s is responsible for controlling the rate of decomposition?

Options

A. Climatic factor
B. Chemical composition of detritus
C. Both (A) and (B)
D. Nature of detritivores

Answer

To determine which factors are responsible for controlling the rate of decomposition, we can break down the information provided in the video transcript into a structured solution.

### Step-by-Step Solution:

1. **Understanding Decomposition**:
- Decomposition is the process by which decomposers break down complex organic matter into simpler inorganic substances, such as carbon dioxide, water, and nutrients.

**Hint**: Decomposition is essential for nutrient cycling in ecosystems.

2. **Identifying Key Factors**:
- The rate of decomposition is influenced by several factors. The key factors identified are:
- Climatic factors (e.g., temperature and humidity)
- Chemical composition of detritus
- Nature of detrivores

**Hint**: Think about how environmental conditions and material properties affect biological processes.

3. **Climatic Factors**:
- Temperature and humidity are crucial climatic factors. Higher temperatures and adequate moisture levels can significantly speed up the rate of decomposition.

**Hint**: Consider how warmth and moisture can enhance microbial activity.

4. **Chemical Composition of Detritus**:
- The composition of the detritus itself plays a vital role. For example:
- Detritus rich in lignin (a complex organic polymer) and cation can slow down decomposition.
- Conversely, detritus that is rich in nitrogen and consists of water-soluble substances (like sugars) tends to decompose more quickly.

**Hint**: Reflect on how the nutritional content of organic matter influences its breakdown.

5. **Nature of Detrivores**:
- Detrivores, such as earthworms, contribute to decomposition by breaking down detritus into smaller particles, a process known as fragmentation. The presence and activity of these organisms can enhance the rate of decomposition.

**Hint**: Think about the role of organisms in breaking down materials and facilitating decomposition.

6. **Conclusion**:
- The main factors controlling the rate of decomposition are:
- Climatic factors (temperature and humidity)
- Chemical composition of detritus
- Nature of detrivores

Therefore, the correct answer to the question is **both A and B** (climatic factors and chemical composition of detritus).

### Final Answer:
Both climatic factors and the chemical composition of detritus are responsible for controlling the rate of decomposition.