Modern farmers can increase the yield of Paddy up to 50% by the use of:
1.  Cyanobacteria
2.  Rhizobium
3.  Cyanobacteria in Azolla pinnata
4.  Farm yard manure

Azolla is used in the cultivation of:

Which of the following is true pair of biofertilizers:
1.  Azolla and BGA
2.  Nostoc and legume
3.  Rhizobium and grasses
4.  Salmonella & E. Coli

Which of the following plants are used as green manure in crop fields and in sandy soils:

1. Crotalaria juncea and Alhagi camelorum

2. Calotropis procera and Phyllanthus niruri

3. Saccharum munja and Lantana camara

4. Dichanthium annulatum and Azolla nilotica

The most thoroughly studied of the known bacteria-plant interactions is the:
 

Which one of the following pairs is not correctly matched:

1. Serratia – Drug addiction

2. Spirulina – Single-cell protein

3. Rhizobium – Biofertilizer

4. Streptomyces – Antibiotic 

A free-living nitrogen-fixing cyanobacterium that can also form a symbiotic association with the water fern Azolla is:

1. Chlorella

2. Nostoc

3. Anabaena

4. Tolypothrix

Bacillus thuringiensis (Bt) strains have been used for designing novel:

1. Bioinsecticidal plants

2. Bio-mineralization processes

3. Biofertilizers

4. Bio-metallurgical techniques