. Which of the following is/are used as biofertilizers?
1. Azolla 2. Blue-green algae 3. Alfalfa
Select the correct answer using the codes given below:
Codes:
(a) 1 alone
(b) 1 and 2
(c) 1 and 3
(d) 1, 2 and 3
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5 Answers WBCS West Bengal Civil Service,
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