Which one of the following is not a nitrogen-fixing organism?

1.	Anabaena	2.	Nostoc
3.	Azotobacter	4.	Pseudomonas

Big holes in Swiss cheese are made by:

The residue left after methane production from cattle dung is:

Methanogens do not produce:

Match the items in Column ‘A’ and Column ‘B’ and choose the correct answer:

The correct answer is:

1. A-ii, B-iv, C-iii, D-i

2. A-iii, B-iv, C-ii, D-i

3. A-iv, B-i, C-ii, D-iii

4. A-iii, B-ii, C-i, D-iv

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 major component of gobar gas is:

For retting of jute the fermenting microbe used is  
1. Mesophilic bacteria
2. Helicobacter pylori
3. Butyric acid bacteria
4. Streptococcus lactis 

Bacillus thuringiensis (Bt) strains have been used for designing novel 
1. Bio Insecticidal plants
2. Biomineralization processes
3. Biofertilizers
4. Bio-metallurgical techniques

Which one of the following pairs is incorrectly matched?