Question

Biofertilizers are

• A. Organic manure
• B. Green manure
• C. FYM
• D. Culture of microorganisms

Hint:

Biofertilizers:
- Rhizobium, Azotobacter, Azospirillum, etc.
- Enhance nutrient availability.
- Environmentally friendly and sustainable.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
This question tests knowledge of biofertilizers and their definition.

Step 2: Detailed Explanation:
Biofertilizers (D) are cultures of microorganisms that enhance nutrient availability.
They include nitrogen-fixing bacteria (Rhizobium, Azotobacter), phosphate-solubilizing bacteria, and mycorrhizal fungi.
Other options:
- Organic manure (A): Decomposed organic matter (e.g., compost).
- Green manure (B): Green plants incorporated into soil.
- FYM (C): Farm yard manure (composted animal dung).
Thus, biofertilizers are cultures of microorganisms.

Step 3: Final Answer:
Thus, biofertilizers are cultures of microorganisms, which corresponds to option (D).
[0.5cm]