The fixed nitrogen is exported in soyabean in the form of :

Options

A. Nitrite
B. Ureides
C. Molecular nitrogen
D. Nitrate

Answer

To solve the question regarding the form in which fixed nitrogen is exported in soybean, we can follow these steps:

### Step 1: Understand Nitrogen Fixation
Nitrogen fixation is the process by which atmospheric nitrogen (N₂) is converted into ammonia (NH₃) by certain bacteria. This process can occur biologically, primarily through symbiotic relationships with plants like soybeans.

**Hint:** Remember that nitrogen fixation is crucial for plants to utilize atmospheric nitrogen.

### Step 2: Identify the Symbiotic Relationship
In soybeans, nitrogen fixation occurs through a symbiotic relationship with nitrogen-fixing bacteria, specifically Rhizobium, which reside in the root nodules of the plant.

**Hint:** Focus on the specific bacteria involved in the symbiosis with soybeans.

### Step 3: Determine the Products of Nitrogen Fixation
The fixed nitrogen in soybeans is converted into various compounds. The primary products of nitrogen fixation in soybeans include ureides, allantoin, and allantoic acid. These compounds are important for the long-distance transport of nitrogen from the roots to the shoots of the plant.

**Hint:** Think about the forms of nitrogen that are transported within the plant.

### Step 4: Evaluate the Given Options
The options provided in the question were:
- Nitrite
- Ureidase
- Molecular nitrogen
- Nitrate

Among these, ureides (which include allantoin and allantoic acid) are the correct forms in which fixed nitrogen is exported from the soybean roots to the shoots.

**Hint:** Look for the form of nitrogen that is specifically mentioned as a transport form in plants.

### Step 5: Conclusion
The correct answer to the question is that the fixed nitrogen is exported in soybeans in the form of ureides.

**Final Answer:** Ureides (including allantoin and allantoic acid).