The rate of decompostion is controlled by

Options

A. Chemical composition of detritus
B. Climatic factors
C. Both (1) and (2)
D. None

Answer

To answer the question "The rate of decomposition is controlled by," we can break down the factors that influence decomposition into several key components. Here’s a step-by-step solution:

### Step 1: Understand Decomposition
Decomposition is the process by which organic matter is broken down into simpler forms of matter. This process is crucial for nutrient cycling in ecosystems.

**Hint:** Think about what happens to dead plants and animals in nature.

### Step 2: Identify Factors Affecting Decomposition
The rate of decomposition is influenced by various factors, which can be broadly categorized into two main types: chemical composition of the dead matter and climatic factors.

**Hint:** Consider both the material that is decomposing and the environmental conditions.

### Step 3: Chemical Composition of Dead Matter
The chemical composition of the dead organic matter (or detritus) plays a significant role in decomposition. For instance:
- Materials rich in lignin and chitin decompose more slowly.
- Materials rich in nitrogen and water-soluble substances (like sugars) decompose more quickly.

**Hint:** Think about what types of organic materials break down faster than others.

### Step 4: Climatic Factors
Climatic factors such as temperature and soil moisture are also crucial.
- Higher temperatures generally increase the rate of decomposition.
- Adequate soil moisture is necessary for microbial activity, which is essential for decomposition.

**Hint:** Reflect on how weather conditions might affect the breakdown of organic materials.

### Step 5: Conclusion
Based on the above factors, we can conclude that the rate of decomposition is controlled by:
1. The chemical composition of dead matter.
2. Climatic factors such as temperature and moisture.

Thus, the correct answer to the question is that the rate of decomposition is controlled by both the chemical composition of dead matter and climatic factors.

### Final Answer
The rate of decomposition is controlled by:
- Chemical composition of dead matter
- Climatic factors
- Therefore, the correct option is "both one and two."

**Hint for Final Answer:** Look for options that combine both the chemical and climatic influences on decomposition.