Question

Match List - I with List - II.

Choose the correct answer from the options given below:

• A. A-I, B-II, C-IV, D-III
• B. A-II, B-IV, C-III, D-I
• C. A-IV, B-III, C-II, D-I
• D. A-II, B-IV, C-I, D-III

Hint:

Solubilizer = Chemically dissolves. Absorber = Physically sucks up. Symbiotic = Lives together. Free-living = Lives alone.

Answer 1

The Correct Option is C

Concept: This matching exercise differentiates between microorganisms that manage nitrogen and those that manage phosphorus in the soil.

Step 1: Solubilizers vs. Absorbers.
Bacillus and Pseudomonas (A) are bacteria that produce organic acids to dissolve mineral phosphorus, making them Phosphate solubilizers (IV). Mycorrhizal fungi (C) physically transport phosphorus into roots, making them Phosphate absorbers (II).

Step 2: Nitrogen Lifestyles.
Azotobacter (B) fixes nitrogen independently in the soil without a host, so it is a Free-living bio-fertilizer (III). Rhizobium (D) requires a legume nodule to fix nitrogen, making it a Symbiotic bio-fertilizer (I).

Step 3: Conclusion.
The correct matching sequence is A-IV, B-III, C-II, D-I.