the rate of decomposition increases if detritus is rich in

Options

A. Lignin and chitin
B. nitrogen compounds like protein and nucleic acid
C. tennis and cellulose
D. chitin and phenotics

Answer

To solve the question regarding the rate of decomposition and the composition of detritus, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Decomposition**:
- Decomposition is the process where organic substances are broken down into simpler organic or inorganic matter. This process is essential for nutrient cycling in ecosystems.

2. **Identifying Detritus Composition**:
- Detritus refers to dead organic matter, which can include plant debris, animal remains, and microbial biomass. The composition of detritus can significantly influence the rate of decomposition.

3. **Evaluating the Options**:
- **Option 1: Lignin and Chitin**:
- Lignin is a complex organic polymer found in the cell walls of plants, and chitin is found in the exoskeletons of arthropods. Both are known to be resistant to decomposition. Thus, a detritus rich in lignin and chitin would slow down the decomposition process.
- **Option 2: Nitrogen Compounds (like proteins and nucleic acids)**:
- Nitrogen is a vital nutrient for microorganisms involved in decomposition. Proteins and nucleic acids are rich in nitrogen and are more easily broken down by decomposers. Therefore, detritus rich in nitrogen compounds would enhance the rate of decomposition.
- **Option 3: Tannin and Cellulose**:
- Tannins are polyphenolic compounds that can inhibit microbial activity, while cellulose, although more digestible than lignin, can still slow down decomposition if present in high amounts. Thus, this option is also incorrect.
- **Option 4: Chitin and Phenolics**:
- Similar to option 1, both chitin and phenolics can inhibit decomposition. Chitin is resistant to breakdown, and phenolic compounds can be toxic to decomposers. Therefore, this option is incorrect as well.

4. **Conclusion**:
- Based on the evaluation of the options, the correct answer is that the rate of decomposition increases if detritus is rich in nitrogen compounds like proteins and nucleic acids.

### Final Answer:
The rate of decomposition increases if detritus is rich in **nitrogen compounds like proteins and nucleic acids**.