Which of the following is/are used as bio–fertilizers ? Select the correct answer from the codes given below :    1. Azolla   2. Blue Green Algae        3. Alfalfa              4. Nitrolin Codes: - Study24x7
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Which of the following is/are used as bio–fertilizers ? Select the correct answer from the codes given below :    1. Azolla   
2. Blue Green Algae       
3. Alfalfa       ...

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A

2 and 4        

B

1, 2 and 4

C

2, 3 and 4

D

1, 2 and 3

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