Q.1 There is no chemical control so far achieved in the field for_________.
Virus infection Bacterial infection Nematodes infection
Q.2 In the nitrogen cycle, the bacteria in root nodules of leguminous plants can convert atmospheric nitrogen into nitrate. These bacteria are called_________.
Nitrifying bacteria Nitrite bacteria Nitrogen –fixing bacteria
Q.3 Bacteria and cynobacteria are the member of the kingdom________.
Monera Protoctista Protophyta
Q.4 Which of the following are the characteristics of a virus?
Respiration Growth Reproduction
Q.5 Viruses are reproduce only_________.
At certain temperatures Inside a living cell In dry conditions
Q.6 Prokaryotes are usually single celled and comprise the________.
Monera kingdom Plantae kingdom Animalia kingdom
Q.7 This is non -living cells and non-living bio-chemical.
Virus Bacteria Algae
Q.8 The bacteria which oxidize reduced inorganic sulphur compounds converted to sulphate in soil.
Thiobacillus Ferrobacillus Nitrosomonas
Q.9 The bacteria which oxidized ammonium to nitrite in soil________.
Thiobacillus Nitrobactor Nitrosomonas
Q.10 The bacteria which oxidized nitrite to nitrate in soil__________.
Q.11 True fungi are composed of filaments and masses of cells which makeup the body of the organisms, known as_______.
mycellium sporos filaments
Q.12 Aspirgillus is important genera of_______.
Fungi Bacteria Virus
Q.13 The dinitrogen (N2) fixation is performed by the enzymes_________.
Nitrogenase Nitrodenase Nitrofinase
Q.14 It is found to formed nodules both in roots and stems and is most important host plant for the symbiotic N 2 fixation..
Dhaicha Guavar Cowpea
Q.15 The anaerobic bacterium which was found responsible for an increase of the nitrogen content in soil.
Clostridium pasteurianum Ferrobacillus Nitrobactor
Q.16 Purity of colour denoted by___________.
Hue Light Chroma
Q.17 “The limiting velocity of a particle falling in fluid medium will be proportional to the square of its diameter.” This low is given by:___________.
Beer Stoke Lambert
Q.18 This enzyme is involved in the BNF.
Rhizobium Azotobacter Nitrogenase
Q.19 “Enrichment of water bodies by nutrients and consequent bloom of algal and other aquatic plants” This is the process known as:_________.
Illuviation Elluviation Eutrophication
Q.20 A branch of soil science which deals with the soil from the crop production point of view_________.
Pedology Ecology Edaphology
Q.21 In montmorillonite, most of the negative charges are developed by__________.
Dissociation of OH group Ionic substitution Ionic structure
Q.22 Particle density is also known as:_________.
True density Bulk density Aopparent density
Q.23 Total porosity is more in________.
Sandy soil Clayey soil Silty soil
Q.24 The dominant potential in saline soil is___________.
Metric Osmotic Gravitational
Q.25 The phenomenon by which hydrogen atoms act as links between water molecules is called as___________.
Polarity Hydrogen bonding Surface tension
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