18682.Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?
Marsh gas
Laughing gas
Propane
Mustard gas
18683.Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?
Clostridium butylicum - lactic acid
Aspergillus niger - citric acid
Yeast - statins
Acetobacter aceti - acetic acid
18684.Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?
Glomus
Trichoderma
Azotobacter
Aspergillus
18685.The biological control of agricultural pests, unlike chemical control is
Very expensive
Polluting
Self perpetuating
Toxic
18686.Which one of the following is used as biological insecticide?
Silkmoth
Caterpillar
Tiger beetle
Mazra Poka
18687.Yeast is used in the production of
Bread and beer
Cheese and butter
Citric acid and lactic acid
Lipase and pectinase
18688.Which of the following microbes is used for commercial production of ethanol?
Trichoderma polysporum
Streptococcus
Clostridium butylicum
Saccharomyces cerevisiae
18689.Crop rotation is used by farmers to increase
Organic content of soil
Nitrogenous content of soil
Soil fertility
All of these
18690.During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undergraded?
Hemi-cellulose
Lignin
Lipids
Cellulose
18691.In paddy fields biological nitrogen fixation is chiefly brought by
Mycorrhiza
Green algae
Cyanobacteria
Rhizobium