Microbes in Human Welfare · Question 49

Select the correct statement from the following:

1. Methanobacterium is an aerobic bacterium found in rumen of cattle
2. Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
3. Biogas, commonly called gobar gas, is pure methane
4. Biogas is produced by the activity of aerobic bacteria on animal waste

A common biocontrol agent for the control of plant diseases is –

1. Bacillus thuringiensis
2. Trichoderma
3. Glomus
4. Baculovirus

The common nitrogen-fixer in paddy fields is –

1. Azospirillum
2. Frankia
3. Rhizobium
4. Oscillatoria

Which one of the following is not used in organic farming ?

1. Earthworm
2. Oscillatoria
3. Snail
4. Glomus

Which of the following is a symbiotic nitrogen fixer?

1. Azotobacter
2. Frankia
3. Azolla
4. Glomus

Which one of the following pairs is wrongly matched?

1. Detergents – lipase
2. Fruit juice – pectinase
3. Alcohol – nitrogenase
4. Textile – amylase

Which of the following is not used as a biopesticide?

1. Bacillus thuringiensis
2. Trichoderma harzianum
3. Nuclear Polyhedrosis Virus (NPV)
4. Xanthomonas campestris

The bacterium Bacillus thuringiensis is widely used in contemporary biology as -

1. Indicator of water pollution
2. Agent for production of dairy products
3. Source of industrial enzyme
4. Insecticide

Modern detergents contain enzyme preparations of

1. thermoacidophiles
2. thermophiles
3. acidophiles
4. alkaliphiles

Trichoderma harzianum has proved a useful microorganism for:

1. biological control of soil-borne plant pathogens
2. reclamation of wastelands
3. gene transfer in higher plants
4. bioremediation of contaminated soils