Which of the following cannot be a biofertiliser?

1. Cyanobacteria

2. Fungi

3. Viruses

4. Bacteria

During sewage treatment when the BOD is reduced significantly, the effluent is passed to the

1. Large aeration tank to form flocs

2. Primary settling tank to remove primary sludge

3. Secondary settling tank to sediment the flocs

4. Anaerobic sludge digester  

Filteration and sedimentation are the components of -

1. Primary treatment 

2. Secondary treatment

3. Tertiary treatment

4. Quaternary treatment

Biological control agent is obtained from:-

1. Bacillus thruingiensis

2. Monascus purpureus

3. Streptococcus

4. Aspergillus niger

Match the following column correctly

               Column-I                   Column-II
(A) Aspergillus niger                (i) Ethanol
(B) Clostridium butylicum         (ii) Statins
(C) Saccharomyces cerevisiae  (iii) Citric acid
(D) Trichoderma polysporum   (iv) Butyric acid
(E) Monascus purpureus          (v) Cyclosporin-A

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

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

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

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

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

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