______conditions are created by lagnaemoglobin in the root nodule of a legume.

Explanation

**Step-by-Step Solution:**

1. **Understanding Leghemoglobin**: Leghemoglobin is a protein found in the root nodules of leguminous plants. It is similar to hemoglobin in animals and plays a crucial role in the nitrogen fixation process.

2. **Function of Leghemoglobin**: The primary function of leghemoglobin is to bind oxygen. This is important because nitrogen-fixing bacteria, such as Rhizobium, require a low-oxygen environment to effectively convert atmospheric nitrogen into ammonia.

3. **Creation of Anaerobic Conditions**: By binding to oxygen, leghemoglobin creates anaerobic conditions in the root nodules. This means that it reduces the amount of free oxygen available, which is essential for the proper functioning of the nitrogen-fixing enzyme, nitrogenase.

...