Leg - haemoglobin is found in the nodules in roots of leguminous plants. It acts as ........ Scavenger and provides ........ Conditions for the action of nitrogenase enzyme.

Options

A. Oxygen , Aerobic
B. Oxygen , Anaerobic
C. `CO_2` Aerobic
D. `CO_2` , Anaerobic

Answer

To solve the question regarding leg-haemoglobin in leguminous plants, we can break it down into the following steps:

### Step 1: Understand the Role of Leg-Hemoglobin
Leg-haemoglobin is a protein found in the root nodules of leguminous plants. Its primary function is to bind oxygen.

**Hint:** Think about how oxygen levels affect nitrogen-fixing bacteria.

### Step 2: Identify the Function of Leg-Hemoglobin
Leg-haemoglobin acts as an oxygen scavenger. This means it removes or binds to oxygen in the root nodules.

**Hint:** Consider why nitrogen-fixing bacteria would need a low-oxygen environment.

### Step 3: Explain the Importance of Anaerobic Conditions
The nitrogenase enzyme, which is crucial for nitrogen fixation, is sensitive to oxygen and can be inactivated by it. Therefore, maintaining anaerobic conditions (absence of oxygen) is essential for the nitrogenase enzyme to function effectively.

**Hint:** Reflect on the relationship between oxygen presence and the activity of nitrogenase.

### Step 4: Conclude the Function of Leg-Hemoglobin
Thus, leg-haemoglobin not only scavenges oxygen but also creates an anaerobic environment that protects the nitrogenase enzyme, allowing the bacteria to fix nitrogen efficiently.

**Hint:** Summarize the dual role of leg-haemoglobin in terms of oxygen management and enzyme protection.

### Final Answer
Leg-haemoglobin acts as an oxygen scavenger and provides anaerobic conditions for the action of the nitrogenase enzyme.