22. Consider the following: Rhizobium Azotobacter Blue Green Algae Which of the above are used as bio fertilizers? [A] 1 & 2 Only [B] 2 & 3 Only [C] 1 & 3 Only [D] 1, 2 & 3 Show Answer
The correct answer is All of these. Rhizobium, Blue-green algae and Azolle is used as Biofertilizer. Biofertilizers include Rhizobium, Azotobacter, Azospirillum, and blue-green algae (BGA)।
