The Vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:

1. vitamin C

2. vitamin D

3. vitamin B₁₂

4. vitamin E

Waste water treatment generates a large quantity of sludge, which can be treated by

1. anaerobic digesters

2. floc

3. chemicals

4. oxidation pond

Methanogenic bacteria are not found in

1. rumen of cattle

2. gobar gas plant

3. bottom of water-logged paddy fields

4. activated sludge

Match the following column of bacteria and their commercially important products.

Codes

Match the following column of bioactive substances and their roles.

Choose the correct match 

The primary treatment of waste water involves the removal of

1. dissolved impurities

2. stable particles

3. toxic substances

4. harmful bacteria

BOD of waste water is estimated by measuring the amount of

1. total organic matter

2. biodegradable organic matter

3. oxygen evolution

4. oxygen consumption

Which one of the following alcoholic drinks is produced without distillation?

1. Wine

2. Whisky

3. Rum

4. Brandy

The technology of biogas production from cow dung was developed in India largely due to the efforts of

The free-livings fungus Trichoderma can be used for

1. killing insects

2. biological control of plant diseases

3. controlling butterfly caterpillars

4. producing antibiotics