In root nodules, leghaemoglobin

Options

A. helps in translocation of minerals
B. acts as an oxygen scavenger
C. acts as a catalyst in transamination
D. transport Oxygen of root nodule

Answer

To solve the question regarding the role of leghaemoglobin in root nodules, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Root Nodules**:
- Root nodules are specialized structures formed by certain plants (like legumes) in association with nitrogen-fixing bacteria (e.g., Rhizobium).
- These nodules provide a habitat for the bacteria, which convert atmospheric nitrogen into a form usable by plants.

**Hint**: Think about the relationship between plants and nitrogen-fixing bacteria.

2. **Role of Oxygen in Nitrogen Fixation**:
- Nitrogen-fixing bacteria require a low concentration of oxygen to effectively fix nitrogen.
- High levels of oxygen can be detrimental to the nitrogen-fixing enzymes.

**Hint**: Consider why bacteria would need a controlled environment for their enzymatic processes.

3. **Function of Leghaemoglobin**:
- Leghaemoglobin is a protein found in root nodules that binds oxygen.
- It acts as an oxygen scavenger, meaning it absorbs and binds oxygen, preventing it from being freely available in the nodule.

**Hint**: Focus on the term "oxygen scavenger" and how it relates to the function of leghaemoglobin.

4. **Transport of Oxygen**:
- Leghaemoglobin does not transport oxygen away from the nodule; instead, it facilitates the delivery of small amounts of oxygen to the bacteria, which is necessary for their respiration.

**Hint**: Think about the direction of oxygen movement and its necessity for the bacteria.

5. **Evaluating the Options**:
- The options given were:
a) Help in translocation of minerals
b) Act as an oxygen scavenger
c) Act as a catalyst in transamination
d) Transport oxygen off root nodule
- Based on the understanding of leghaemoglobin's function, the correct answer is that it "acts as an oxygen scavenger."

**Hint**: Compare each option with the role of leghaemoglobin to determine which one aligns with its function.

### Final Answer:
The correct option is: **Act as an oxygen scavenger.**