Match the Column I with Column II :

(A)-ii , (B)-i, (C)-iv , (D)- iii

The correct answer is Option (4) –(A)-ii , (B)-i, (C)-iv , (D)- iii

(A) Aspergillus — (ii) Citric acid:
Aspergillus is a genus of fungi that is used in the industrial production of citric acid.

(B) Azotobacter — (i) Free-living nitrogen-fixing bacteria:
Azotobacter is a free-living nitrogen-fixing bacterium found in the soil, which plays a key role in nitrogen fixation.

(C) Rhizobium — (iv) Rhizobial biofertilizers:
Rhizobium is a bacterium that forms symbiotic relationships with legumes to fix atmospheric nitrogen, commonly used as a biofertilizer.

(D) Nostoc, Anabaena — (iii) Cyanobacterial biofertilizers:
Nostoc and Anabaena are cyanobacteria capable of fixing nitrogen, and are used as biofertilizers in agriculture.