Microbes in Human Welfare questions
610 published questions with worked solutions.
- Before sewage is let into natural water bodies, it must be treated to make it less polluting; this is carried out in
- In sewage treatment, the first step, which removes large and small particles through filtration and sedimentation, is called
- The supernatant left after primary treatment of sewage is passed on to perform
- Secondary (biological) treatment of sewage primarily involves
- During secondary treatment of sewage, once the BOD is reduced significantly, the effluent is passed into a settling tank where
- A small part of the activated sludge from the settling tank is used as
- The remaining major part of the activated sludge (after secondary treatment) is pumped into large anaerobic tanks called
- In anaerobic sludge digesters, anaerobic bacteria break down the sludge, producing a mixture of gases such as methane, hydrogen...
- Biogas is a mixture of gases produced by the activity of
- Methanogens such as Methanobacterium are commonly found in the
- Cattle dung is especially rich in methanogenic bacteria, and hence it is commonly used in India to produce biogas, which is also...
- A biogas plant consists of a concrete tank (digester) where the slurry of dung and water is fermented, and above it, a floating...
- Biogas is predominantly composed of which flammable gas, making it useful as a fuel for cooking and lighting?
- Which institute played a key role in developing biogas plant designs in India, such as the "KVIC" model?
- Which of the following is an advantage of biogas plants commonly set up in rural India?
- In a biogas plant, slurry (dung + water) is fed into the digester, where it remains for a period to allow
- Which of the following statements about biogas plants is INCORRECT?
- Organisms that are used to protect plants from diseases and pests by using biological means rather than chemicals are...
- Which of the following best summarises the ecological rationale for biological control over chemical control of pests?
- Which of the following is an example of using a predatory insect for pest control in agricultural fields?
Other chapters
Alcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAlternating CurrentAminesAnatomy of Flowering PlantsAncient Indian HistoryAnimal KingdomApplication of DerivativesArea Under CurveAromatic Compounds and Aryl HalidesAtomsBasic Mathematics and LogarithmBinomial TheoremBiodiversity and ConservationBiological ClassificationBiomoleculesBiotechnology and Its ApplicationsBiotechnology: Principles and ProcessesBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionCell: The Unit of LifeChemical Bonding and Molecular StructureChemical Coordination and Integration