In which one of the following the BOD (Biochemical Oxygen Demand ) of sewage (s), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?
SE < S < PE < DE
SE < PE < S < DE
PE < S < SE < DE
PE < S < SE < DE
D.
PE < S < SE < DE
The ascending order of BOD is sugar mill effulent> paper mill effulent> Distillery effluent> Sewage.
In a coal-fired power plant, electrostatic precipitators are installed to control emission of
SO2
NOX
SPM
SPM
Which one of the following statements is correct?
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
Quercus species are the dominant component in
temperature deciduous forests
alpine forests
scrub forests
tropical rain forests
Which one of the following is being utilised as a source of biodiesel in the Indian countryside?
betroot
sugarcane
pongamia
pongamia
