Which among the following statements about bio fertilizers are correct ? . 1. Azotobacter is one of the Nitrogen fixing bacteria used as a bio fertilizer. 2. They have to be applied to the leaves of the plant only. 3. They alter the chemical composition o

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Q: 24 (CDS-II/2010)
Which among the following statements about bio fertilizers are correct ? .
1. Azotobacter is one of the Nitrogen fixing bacteria used as a bio fertilizer.
2. They have to be applied to the leaves of the plant only.
3. They alter the chemical composition of the soil.
4. They can be used along with organic fertilizers.

Select the correct answer using the code given below :

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,69,40,69,17,4,19

keywords: 

{'bio fertilizers': [0, 0, 1, 0], 'bio fertilizer': [0, 0, 1, 0], 'organic fertilizers': [1, 0, 1, 1], 'azotobacter': [0, 0, 2, 0], 'nitrogen': [1, 1, 0, 2], 'soil': [7, 0, 4, 7], 'bacteria': [4, 1, 2, 3], 'chemical composition': [0, 0, 1, 2]}

Option-1 is correct, which states that Azotobacter is one of the nitrogen-fixing bacteria used as a biofertilizer. Azotobacter is a free-living bacteria that fixes atmospheric nitrogen and converts it into a form that is easily available to plants.

Option-2 is incorrect. Biofertilizers are usually applied to the soil, not the leaves of the plant. They are added to the soil during planting or through irrigation.

Option-3 is incorrect. Biofertilizers do not typically alter the chemical composition of the soil. Their main function is to enhance the nutrient content of the soil and improve its fertility.

Option-4 is correct. Biofertilizers can be used along with organic fertilizers. Organic fertilizers, such as compost or manure, provide nutrients to the soil, while biofertilizers help in improving nutrient availability and enhancing soil fertility.

In conclusion, the correct statements about biofertilizers are that Azotobacter is one of the nitrogen-fixing bacteria used as a biofertilizer, and biofertilizers can be used along with organic fertilizers.