Microbes in human welfare practice · Mixed difficulty

The organisms which are used to enrich the nutrient quality of the soil are called

In the sewage treatment bacterial flocs are allowed to sediment in a settling-tank. This sediment is called as

Citric acid is industrially best produced by

An organism used as biofertiliser for raising any legume crop is

During sewage treatment, methane is formed

A biological control being developed for use in treatment of plant diseases in Trichoderma, it is a

Which is wrongly matched?

Sewage contains large amounts of …A… and …B… . Here A and B refers to

Consider the following statements about, secondary sewage treatment
I. In secondary treatment useful aerobic microbes grow rapidly and form flocs. Flocs are masses of bacteria associated with fungal filaments to form mesh-like structures.
II. The growing microbes consume organic matter and thus reduce the biochemical oxygen demand.
When BOD of sewage has reduced, the effluent is passed into settling tank.
III. In settling tank, the bacterial flocs settle and the sediment is called activated sludge.
IV. A small part of the sludge is used as an inoculum in the aeration tank and the remaining part is passed into large tanks called anaerobic sludge digesters.
V. In the digesters, heterotrophic microbes anaerobically digest bacteria and fungi in sludge producing mixture of gases such as, carbon dioxide nitrogen and carbon monoxide which form the biogas
Which of the statements given above are correct?

Which of the following is a non-symbiotic biofertilizer?

Assertion: Bacculovirus are used as biocontrol agent.

Reason: Bacculovirus are used in ecologically vulnerable areas.

Assertion: Azospirillum and Azotobacter enriching the nitrogen content of soil.

Reason: They are free living nitrogen fixer in soil.

Assertion : Yeasts such as Saccharomyces
cerevisiae are used in baking industry.

Reason : Carbon dioxide produced during
fermentation causes bread dough to rise by
thermal expansion.

The starter or inoculum is added to the fresh milk in order to convert milk into curd, the term starter or inoculum here refers to

The microorganism used in production of biogas is

Assertion: Most orchid seedlings cannot
develop well in the absence of fungal mycelium.

Reason: Fungal mycelium increases efficiency
of absorption only

Bacillus thuringiensis (Bt) strains have been used for designing novel

BOD may not be a good index for pollution for water bodies receiving effluents from?

Consider the following statements about methanogens bacteria
I. Methanogen bacteria are commonly found in the anaerobic sludge formed during sewage treatment
II. These bacteria are also occur in rumen of the cattle where they act upon cellulosic material to breakdown cellulose
III. They play a very important role in the nutrition of cattle by digesting cellulosic material
Which of the statement given above are correct?

Cholesterol lowering agent called statins are produced by

In sewage treatment plants, the soil and small pebbles are removed by

Assertion: We give cyclosporin A to organ transplanted patients.

Reason: It is an immunosuppressive agent.

Find the wrong matched pair

Which of the given is major component of biogas w.r.t. their relative contribution in it?

Microbe used for biocontrol of pest butterfly caterpillars is

BOD of waste water is estimated by measuring the amount of

Biochemical Oxygen Demand (BOD) in a river water

In a gobar gas plant, methogens convert

Activated sludge have the ability to settle quickly so that it can

How many of the following beverages are produced by distillation of the fermented broth?
Whisky, Wine, Rum, Brandy, Beer