89851. Which of the following acid will have higher bacteriostatic effect at a given pH?
89852. Which of the following is not true for the thermal resistance of the bacterial cells?
89853. Water activity can act as
89854. Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?
89855. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
89856. Bacteria, as a group, are responsible for
89857. The phenomenon of commensalism refers to a relationship between organisms in which
89858. The population of algae in soil is __________ that of either bacteria or fungi.
89859. The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
89860. Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
89861. The diagnostic enzyme for denitrification is
89862. A heterocyst is
89863. The groups of symbiotic bacteria, which have the ability to fix nitrogen
89864. Nitrogen oxidation (nitrification)refers to the
89865. An example of a symbiotic nitrogen fixer is
89866. In the process of nitrogen fixation, which of the following microorganism is involved?
89867. Which of the following statement is not true about composition of biogas?
89868. The physical structure of soil is improved by the accumulation of
89869. __________ play a key role in the transformation of rock to soil.
89870. The groups of bacteria which have the ability to fix nitrogen from air to soil are
89871. The nitrogenase consists of
89872. The crops which are involved in nitrogen fixation are
89873. Denitrification may be distinguished as
89874. The conversion of molecular nitrogen into ammonia is known as
89875. The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?
89876. Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
89877. Some microorganisms have the ability to increase the nitrogen content of soils, are called as
89878. Nitrogen fixation
89879. For rapid decomposition by microbes, the substrate should have a C/N ratio of
89880. Which are the main source of biofertilisers?
89881. The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
89882. Denitrification is
89883. Degree of compost maturity can be assesed by
89884. The energy value of biogas is typically
89885. The microbial ecosystem of soil includes
89886. Denitrification is carried out
89887. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
89888. The diagnostic enzyme for nitrogen-fixing organisms is
89889. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
89890. Syntrophism involves
89891. Assimilative denitrification is done by
89892. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
89893. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
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