Yeast is used in the production of

1. citric acid and lactic acid

2. lipase and pectinase

3. bread and beer

4. cheese and butter

Which one of the following is an example of carrying out biological control of pests/diseases using microbes?

1.Trichoderma sp. against certain plant pathogens.

2. Nucleopolyhedrovirus against white rust in Brassica

3. Bt-cotton to increase cotton yield

4. Lady bird beetle against aphids in mustard

Which one of the following helps in absorption of phosphorus from soil by plants?

1. Rhizobium

2. Anabaena

3. Frankia

4. Glomus

Secondary sewage treatment is mainly a

1. mechanical process

2. chemical process

3. biological process
4. physical process

Select the correct statement from the following

1. Biogas is produced by the activity of aerobic bacteria on animal waste

2. Methanobacterium is an aerobic bacterium found in rumen of cattle.

3. Biogas, commonly called gobar gas, is pure methane

4. Activated sludge-sediment in settlement tanks of sewage treatment plant is a right source of aerobic bacteria

A common biocontrol agent for the control of plant disease is 

1. Baculovirus

2. Bacillus thuringiensis

3. Glomus

4. Trichoderma

Which of the following is not used as a biopesticide?

1. Bacillus thuringiensis

2. Trichoderma harzianum

3. Nuclear Polyhedrosis Virus (NPV)

4. Xanthomonas campestris

A compound which is produced by an organism that inhibits growth of other organism is

called:

1. xenobiotics                         

2. antibiotic

3. antibody                             

4. interferon

Select the correct statement

1. Acetobacter aceti produces citric acid.

2. Saccharomyces cerevisiae is used as clot buster

3. Penicillium notatum restrict the growth of Staphylococci

4. Methanogens are found in aerobic conditions.

Which of the following statements is incorrect regarding fermentation ?

1. Propionibacterium is used to ferment the cheese.

2. The puffed-up appearance of dough is due to the production of $C{O}_2$ gas. 

3. Fermentation in muscle produces ethanol.

4. Toddy is made by fermenting sap from palms.