Microbes in Human Welfare · Question 59

Which one of the following proved effective for biological control of nematodal disease in plants?

1. Pisolithus tinctorius
2. Paecilomyces lilacinus
3. Pseudomonas cepacia
4. Gliocladium virens

Probiotics are-

1. Cancer inducing microbes
2. New kind of food allergens
3. Live microbial food supplement
4. Safe antibiotics

Which one of the following pairs is wrongly matched ?

1. Methanogens – Gobar gas
2. Yeast – Ethanol
3. Streptomycetes – Antibiotic
4. Coliforms – Vinegar

Which one of the following statements is correct?

1. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil
2. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
3. At present it is not possible to grow maize without chemical fertilizers
4. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

Curing of tea leaves is brought about by the activity of

1. fungi
2. bacteria
3. mycorrhiza
4. viruses

For retting of jute the fermenting microbe used is

1. methanophilic bacteria
2. butyric acid bacteria
3. Helicobacter pylori
4. Streptococcus lactis.

A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is

1. Tolypothrix
2. Chlorella
3. Nostoc
4. Anabaena

Dough kept overnight in warm weather becomes soft and spongy because of :-

1. Cohesion
2. Absorption of carbon dioxide from atmosphere
3. Osmosis
4. Fermentation

Which one of the following pairs is not correctly matched ?

1. Spirulina – Single cell protein
2. Streptomyces – Antibiotic
3. Rhizobium – Biofertilizer
4. Serratia – Drug addiction

A major component of gobar gas is

1. ethane
2. methane
3. butane
4. ammonia