Which one of the following is a correct option with reference to pathogenic bacteria and DDT?

Options

A. Bacteria can undergo multiplication and DDT is degraded by living cells
B. Bacteria can be degraded by living cells and DDT can not be degraded by living cells .
C. Bacteria can undergo biological magnification and DDT can be degraded by living cells .
D. Bacteria can undergo biological magnification and DDT can not be degraded by living cells.

Answer

To solve the question regarding the relationship between pathogenic bacteria and DDT (dichlorodiphenyl trichloroethane), we will analyze the options provided and determine which one is correct based on our understanding of bacteria and DDT.

### Step-by-Step Solution:

1. **Understanding Bacteria**:
- Bacteria are prokaryotic organisms, meaning they lack membrane-bound organelles.
- They are generally biodegradable, which means they can be broken down by living cells.

2. **Understanding DDT**:
- DDT is a synthetic pesticide that is known for its use in agriculture.
- It is classified as a non-biodegradable pollutant, meaning it does not break down easily in the environment.
- DDT can undergo biological magnification, which is the process where the concentration of a toxin increases at each successive level of the food chain.

3. **Analyzing the Options**:
- **Option 1**: "Bacteria can undergo multiplication and DDT is degraded by living cells."
- This is partially correct; bacteria can multiply, but DDT is not degraded by living cells. Thus, this option is incorrect.

- **Option 2**: "Bacteria can be degraded by living cells and DDT cannot be degraded by living cells."
- This statement is correct. Bacteria can be degraded by living cells, while DDT cannot be degraded by living cells. Thus, this option is correct.

- **Option 3**: "Bacteria can undergo biological magnification and DDT can be degraded by living cells."
- This is incorrect. Bacteria do not undergo biological magnification, and DDT cannot be degraded by living cells.

- **Option 4**: "Bacteria can undergo biological magnification and DDT cannot be degraded by living cells."
- This is incorrect for the same reason as above; bacteria do not undergo biological magnification.

4. **Conclusion**:
- The correct option is: "Bacteria can be degraded by living cells and DDT cannot be degraded by living cells."

### Final Answer:
The correct option is: **Bacteria can be degraded by living cells and DDT cannot be degraded by living cells.**