Roots associated with nitrogen fixing bacteria are

Options

A. Fusiform root
B. Napiform root
C. Nodulated roots
D. Conical roots

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the type of roots that are associated with nitrogen-fixing bacteria.

2. **Identifying Key Terms**: The key term here is "nitrogen-fixing bacteria." These bacteria are known to form symbiotic relationships with certain plants, particularly legumes.

3. **Recognizing Types of Roots**: The options provided are:
- Fusiform root
- Napiform root
- Modulated root
- Conical root

4. **Analyzing Each Option**:
- **Fusiform Root**: These roots are swollen in the middle and taper at both ends, commonly found in plants like radish. They are primarily for storage, not nitrogen fixation.
- **Napiform Root**: This type of root is bulbous and found in plants like turnips. It is also used for storage and does not relate to nitrogen fixation.
- **Conical Root**: These roots are conical in shape and are found in plants like carrots. They serve as storage roots and are not associated with nitrogen-fixing bacteria.
- **Modulated Root**: This term is not commonly used in the context of nitrogen fixation and does not refer to a specific type of root associated with nitrogen-fixing bacteria.

5. **Identifying the Correct Answer**: The correct type of root associated with nitrogen-fixing bacteria is the **Nodulated Root**. These roots form nodules that house nitrogen-fixing bacteria, such as Rhizobium, and are typically found in leguminous plants like peas and soybeans.

6. **Conclusion**: Therefore, the answer to the question is that the roots associated with nitrogen-fixing bacteria are **Nodulated Roots**.

---