Consider the following statements 1 A particular strain of Pseudomonas putida is able to solubi...........

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Consider the following statements.

1.A particular strain of Pseudomonas putida is able to solubilize the insoluble phosphate from organicphosphate sources in soil.

2.Nitrogen-fixation by the cyanobacteria provides rice plantations with biofertilizer.

3.Azotobacter, as a biofertilizer, can be used with cereal crops as well as vegetable crops.

Select the correct answer using the codes below.

1 only

2 and 3 only

1 and 3 only

1, 2 and 3

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Explanation:

Statement 1: Due to immobilization of phosphate by mineral ions such as Fe, Al and Ca or organic acids, the rate of available phosphate (Pi) in soil is well below plant needs. Hence, the need for such biofertilizers.
Statement 2: Blue green algae belonging to a general cyanobacteria genus fix atmospheric nitrogen and are used as inoculations for paddy crop grown both under upland and low-land conditions.
Statement 3: Rhizobiuminoculant is used for leguminous crops. Azotobacter can be used with crops like wheat, maize, mustard, cotton, potato and other vegetable crops. Azospirillum inoculations are recommended mainly for sorghum, millets, maize, sugarcane and wheat.
Nitrogen-fixation by the cyanobacteria such as (Anabaena, a symbiont of the aquatic fern Azolla), provides rice plantations with biofertilizer. Free-living cyanobacteria are also present in the water column in rice paddies.