Microorganisms are used during which stage of the purification of the sewage water?

(1) Primary treatment

(2) Secondary treatment

(3) None of the above

(4) Both (1) and (2)

Big holes in Swiss cheese are made by a:

The residue left after methane production from cattle dung is:

1. burnt

2. burried in land fills

3. used as manure

4. used in civil construction

The free-living fungus Trichoderma can be used for:

1. killing insects

2. biological control of plant diseases

3. controlling butterfly caterpillars

4. producing antibiotics

Identify the incrrectly matched pair:

1. Trichoderma harzianum -  Biocontrol

2. Aspergillus niger  - source of citric acid

3. Baculovirus - narrow spectrum species specific insecticides

4. Monascus purpureus - source of cholesterol synthesizing enzyme

Identify the incorrectly matched pair 

An important biofertilizer in paddy fields is :

1. Azospirillum

2. Azotobacter

3. Anabaena

4. Rhizobium

Identify the incorrect matched pair:

1. Trichoderma harzianum: Cyclosporin A

2. Monascus purpureus: Statins

3. Aspergillus niger: Citric acid

4. Streptococcus pyogenes: Clot buster

Identify the incorrectly matched pair:

Gases found in biogas are:
1. Carbon dioxide is the only gas
2. Methane is the only gas
3. Carbon dioxide, hydrogen sulphide and Methane
4. Carbon dioxide, hydrogen cyanide and Methane