12, Bio Human welfare

The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is

• vitamin C

• vitamin D

• vitamin B12

• vitamin E

Methanogenic bacteria are not found in

• rumen of cattle

• gobar gas plant

• bottom of water-logged paddy field

• activated sludge

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

• a starter rich in vitamin B12

• a starter rich in proteins

• a starter containing milions of LAB

• an aerobic digester

Antibiotics are obtained from

• bacteria

• fungi

• actinomycetes

• all of these

Biofertilisers are

• some bacteria and cyanobacteria

• fertilisers formed by ploughing in barseem

• fertilisers obtained by decay of dead organisms

• fertilisers prepared by mixing cattle dung with crop residues

The symbiotic association between fungi and roots of higher plants is referred to as

• lichen

• mycorrhiza

• biofertiliser

• biocontrol agent

Enzyme which has the fibrinolytic effect is

• lipase

• amylase

• protease

• streptokinase

Statins used for lowering blood cholesterol level are extracted from

(a)

(b)

(c)

(d)

• yeast

• viruses

• bacteria

• algae

During the primary treatment of sewage, solid particles that settle down are called

• flocs

• primary sludge

• activated sludge

• anaerobic sludge

The purpose of biological treatment of waste water is to

• increase sedimentation

• reduce sedimentation

• increase BOD

• reduce BOD