In paddy field which of the following serves as an important biofertilizer.

Options

A. B.G.A
B. Rhizobium
C. Glomus
D. Azadirachta

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which organism serves as an important biofertilizer in paddy fields. Biofertilizers are substances that contain living microorganisms which promote plant growth by increasing the availability of nutrients.

2. **Identifying the Options**: The options provided are:
- A) BGA (Blue-Green Algae)
- B) Rhizobium
- C) Glomus
- D) Azadirachta

3. **Evaluating Each Option**:
- **Option A: BGA (Blue-Green Algae)**: Blue-green algae are known to fix atmospheric nitrogen and can enhance soil fertility. They are commonly used as biofertilizers in paddy fields.
- **Option B: Rhizobium**: While Rhizobium is important for nitrogen fixation, it primarily associates with leguminous plants and is not typically used as a biofertilizer in paddy fields.
- **Option C: Glomus**: Glomus is a genus of arbuscular mycorrhizal fungi that forms symbiotic relationships with plants, helping them absorb nutrients, particularly phosphorus. However, it is not specifically recognized as a primary biofertilizer in paddy fields.
- **Option D: Azadirachta (Neem)**: Azadirachta, commonly known as neem, is used for its medicinal properties and pest control but is not classified as a biofertilizer.

4. **Conclusion**: Based on the evaluation, the best answer is **A) BGA (Blue-Green Algae)**, as it serves as an important biofertilizer in paddy fields.