Biofertilizers include

Options

A. Blue-green algae, Rhizobia, Other nitrogen-fixing bacteria and Mycorrhizae
B. Blue-green algae, Rhizobia and Other nitrogen fixing Bacteria only
C. Rhizobia, Other nitrogen-fixing bacteria and Mycorrhizae only
D. Blue-green algae, Rhizobia and Mycorrhiza only

Answer

### Step-by-Step Solution:

1. **Understand the Concept of Biofertilizers**:
- Biofertilizers are substances that contain living microorganisms which promote plant growth by increasing the supply or availability of primary nutrients to the host plant.

2. **Identify the Components of Biofertilizers**:
- The main components of biofertilizers include:
- **Blue-green algae**: These are photosynthetic bacteria that can fix atmospheric nitrogen.
- **Rhizobia**: These are bacteria that form symbiotic relationships with legumes and fix nitrogen in the root nodules.
- **Other nitrogen-fixing bacteria**: These include various bacteria that can convert atmospheric nitrogen into a form usable by plants.
- **Mycorrhiza**: This is a symbiotic association between fungi and plant roots that enhances nutrient absorption, particularly phosphorus.

3. **Analyze the Given Options**:
- The options provided are:
- A) Blue-green algae, rhizobia, other nitrogen-fixing bacteria, and mycorrhiza.
- B) Blue-green algae, rhizobia, and other nitrogen-fixing bacteria only.
- C) Rhizobia, other nitrogen-fixing bacteria, and mycorrhiza only.
- D) Blue-green algae, rhizobia, and mycorrhiza only.
- We need to determine which option includes all the essential components of biofertilizers.

4. **Select the Correct Option**:
- After reviewing the components, option A includes all the necessary elements: blue-green algae, rhizobia, other nitrogen-fixing bacteria, and mycorrhiza.
- Therefore, the correct answer is **Option A**.