Which of the following is/are used as biofertilizers ? Select the correct answer from the codes given below:1. Azolla2. Blue Green Algae3. Alfalfa4. NitrolinCodes:

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Which of the following is/are used as biofertilizers ? Select the correct answer from the codes given below:<br />1. Azolla<br />2. Blue Green Algae<br />3. Alfalfa<br />4. Nitrolin<br />Codes: