76801. Some microorganisms have the ability to increase the nitrogen content of soils, are called as
76802. Nitrogen fixation
76803. For rapid decomposition by microbes, the substrate should have a C/N ratio of
76804. Which are the main source of biofertilisers?
76805. The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
76806. Denitrification is
76807. Degree of compost maturity can be assesed by
76808. The energy value of biogas is typically
76809. The microbial ecosystem of soil includes
76810. Denitrification is carried out
76811. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
76812. The diagnostic enzyme for nitrogen-fixing organisms is
76813. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
76814. Syntrophism involves
76815. Assimilative denitrification is done by
76816. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
76817. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
76818. Which of the following is not the biofertilisers producing bacteria?
76819. Which of the following is capable of oxidizing sulfur to sulfates?
76820. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
76821. The Nedumcotta or the Travancore lines was built by?
76822. Idinju Polinja Lokam is a book written by?
76823. Idinju Polinja Lokam is a book written by?
76824. Government imposes taxes to?
76825. Volume of a solid sphere is:
76826. Advanced treatment is generally used to treat waste water to
76827. Treatment of municipal water supplies is based upon
76828. What is an anaerobic digester?
76829. The use of microbes to break down synthetic waste products such as polychlorinated biphenyls is called
76830. Activated sludge contains large number of
76831. Iron bacteria can produce
76832. Biomass
76833. Composting is one of the oldest forms of disposal of waste. It is the natural process of decomposition of organic waste that yields manure or compost. One of the following is added to the compost to get better results?
76834. Which is not a form of biomass energy?
76835. Which of the following statement is not correct?
76836. Oxidation ponds are shallow ponds, generally designed at the depth of
76837. Which of the following is generally not referred to the sewerage system?
76838. The magnitude of BOD of wastewater is related to
76839. A dense bacterial population caught in a tangled web of fibers sticking to a surface describes
76840. Biogas production is
76841. The acetate-utilizing methanogens are responsible for
76842. Which of the following is responsible for the corrosion problem?
76843. Water testing relies on the detection of certain indicator organisms known as
76844. The death of a river by environmental pollutants ultimately results from
76845. The concept of putting microbes to help clean up the environment is called
76846. Which of the following is not employed as an oxidation method?
76847. The filtering medium of trickling filters is coated with microbial flora, known as
76848. Some cyanobacteria produce potent neurotoxins that, if ingested, will kill humans. These cyanobacteria are most likely to contaminate
76849. The biogas production process takes place at the temperature